How Many Gallon Water Heater For Family Of 5?

What Size Of Water Heater Does A Family Of Five Need?

The water heater is a significant financial investment in your house.Anyone in the family shouldn’t have to start their day with a chilly shower because of the tank you’ve placed, so make sure it’s large enough.However, if it is excessively large, you will be charged for the energy required to heat all of the water that you will not be utilizing.The amount of people that live in your house is a good place to start when determining what size is optimal for your family.

What Size Of Tank Does My Family Need?

  • The majority of water heater tanks are 40 to 60 gallons in capacity
  • this equates to between 180 and 270 litres, while in Canada, tank capacity is often measured in gallons. Sizes range from as little as 20 gallons to as much as 100 gallons, depending on your need. Four elements influence the size of the tank that is appropriate for your house: the energy source, the size of the tank’s storage area, the size of the residence, and the number of people living in the home. Source of energy: Energy sources for water heaters include electricity, natural gas, and propane, which are the three most popular types of fuel. It may also be connected to a boiler if your home is equipped with one.
  • Water heaters are frequently stashed away in the basement or laundry room, where they might be difficult to access. In addition, ensure that the unit has half an inch of space on all sides, with 12″ in front and 18″ off the ground
  • The Dimensions of the House: The number of bathrooms and bedrooms in a property can help decide the size of the water heater that will be needed. A tank with a capacity of at least 50 gallons would be required for a four-bedroom home with 2.5 bathrooms.
  • The number of people that live in the house is as follows: The tank should be large enough to accommodate the entire household’s needs.

Despite the fact that all of the parameters are crucial, the final two have the most influence on the size of the tank.More rooms or persons in the house will necessitate the use of more gallons in order to keep up with the demand.A 60-gallon tank (if hot water usage is medium) or an 80-gallon tank (if hot water consumption is high) is the most appropriate size for a family of five (if hot water consumption is high).Keep in mind that the tank will last around 12 years, and that hot water demands may fluctuate over that period.When choosing a replacement, keep your family’s long-term requirements in mind.

Could My Family Go Tankless?

Tankless water heaters are excellent for ensuring that hot water is always available at all times, even when it is most needed.In contrast to traditional tank-style water heaters, this sort of heater employs inside coils to ensure that the water is hot as you need it, rather than storing the water for later use.Although the initial expenses of a tankless system are often greater than those of a traditional hot water tank, the system’s efficiency may more than make up for this difference.Unfortunately, for most families of five, a tankless water heater is not a viable choice to consider.Given the limited amount of hot water it can supply at a given moment, it may not be able to keep up with demand entirely.

If you have a large number of people using the water at the same time, a tankless heater will not perform as well as you would want.If you need a new water heater or want to improve your old one, Premier Heating and Cooling can recommend the most appropriate model for your house and family’s needs.Remember that a tank with a capacity of 60 to 80 gallons should be sufficient for a household of five people, and you should make your selection with the future decade in mind!

What Size Water Heater Do I Need?

A water heater is a necessary investment for any home, regardless of its size.Having said that, it’s critical to ensure that you get one that is the appropriate size in order to fulfill the demands of your family.Otherwise, you may find yourself without hot water for your morning shower on a more frequent basis than you would want.Today, we’ll go over the differences between the two most common types of water heaters in order to assist you in selecting the best one for your needs.We’ll also provide you an overview of the most common water heater sizes, as well as guidance on how to select the most appropriate size for your needs.

Storage Tank or Tankless?

Storage tank water heaters and tankless water heaters are the two most common types of water heaters. You must first select whatever sort of water heater you intend to purchase before determining the appropriate size.


  • A tankless water heater, despite the fact that it is more expensive up front, will ensure that you always have hot water. Tankless water heaters function by heating water on demand using built-in coils, which means you’ll always have hot water on hand when you need it. As a result, these types of water heaters are more energy efficient than typical storage tank water heaters, which may result in a reduction in your monthly energy expenditures. The only snag is that there is a catch. They are only capable of producing a limited volume of hot water every minute. Newer tankless devices, on the other hand, are capable of handling up to 9.8 gallons of water per minute at the same time. This allows you to take many showers at the same time! Pros: More energy-efficient
  • hot water on demand
  • less maintenance.
  • Negatives: Only a limited amount of hot water is available each minute
  • Not suitable for everyone
  • a high initial outlay

Storage tank

  • Tank-style water heaters are significantly more widespread than tankless water heaters. This type of water heater is distinguished by the presence of an insulated tank that reserves hot water until it is required. We’ve all had the unpleasant experience of running out of hot water or having to wait for the water to heat up before getting into the shower. These sorts of events occur because storage tank units have a recovery increase, which refers to the quantity of water they can heat in an hour, which causes them to overheat. The greater the reliance on hot water in your house, the greater the recovery climb that will be required. Pros: Low initial outlay of funds
  • Suitable for large families or groups of people
  • Drawbacks: Only a limited volume of hot water can be produced in a given length of time
  • not as energy efficient

Water Heater Sizes

  • There are many different sizes of hot water heaters available, and you must first assess your usual water use in order to make an informed decision on which size to purchase. Several important considerations should be kept in mind in order to further limit down your search: Choosing your fuel source – Will you be using natural gas, liquid propane, or electricity as your primary fuel source? Is it possible that your water heater will connect to your boiler? Making this determination initially will assist you in narrowing down your selections and making the purchasing experience much simpler
  • Physical dimensions – Make certain that the water heater you choose will fit into the area you have allotted in your home.
  • What is the size of your household? Do you live in a tiny condo or a huge house? Is it simply you and your spouse, or do you have a large number of relatives and friends? When buying for a water heater, the size and occupancy of your family are two of the most critical considerations to make since you don’t want the person who showers last to be stranded with cold water.

When compared to a small condo where you only need hot water for one task at a time, you’ll most likely need a larger capacity water heater to accommodate a household where multiple people shower, run the dishwasher, wash dishes with the faucet, and do laundry at the same time, as opposed to a large family home.

What Size Water Heater Do I Need?

  • For those of you who are considering a storage tank water heater, the following is a general reference to the storage tank capacity: You’ll need a water tank with at least a 30-gallon capacity if you’re cooking for 1 or 2 people.
  • You’ll need a tank with a capacity of at least 40 gallons for two to three persons.
  • It is recommended that you use an electric or natural gas tank with a capacity of 50-gallon (electric) or 40-gallon (natural gas or liquid propane) for three to four persons.
  • If you have a household of five or more people, you’ll need an 80-gallon electric tank or a 50-gallon natural gas or liquid propane tank.
  • Tank for storing items Hot water heaters are scaled based on the amount of BTUs they use and the amount of water they hold in gallons. Again, the more the amount of time you rely on hot water on a daily basis, the greater the amount of BTUs and capacity you will require. Consider, for example, how many showers individuals in your home take as a result of the consequences of their actions. If you have four individuals each take a ten-minute shower over the course of an hour, you will consume around 40 gallons of hot water in total. This can quickly deplete the tank’s capacity, and it may not reheat quickly enough for subsequent applications. It only takes one person to take a longer shower for the tank to be completely empty. When deciding on the tank size that is best for you, keep in mind your normal daily activities. If you’re thinking about taking the tankless way, your purchasing experience will be a little different. Because tankless water heaters do not store water, there is no need to worry about the capacity of the unit. You must, however, keep two considerations in mind: the flow velocity and the temperature rise (see Figure 1). You’ll need to total up the flow rates of all of the appliances you want to use at the same time in order to establish the water heater flow rate that you’ll require (showers, washing machines, etc.). In order to calculate the required temperature rise, subtract the entering water temperature from the desired exiting water temperature and multiply the result by 100. The temperature of ground water can vary significantly across the county and at different times of the year. Before making a purchase choice, conduct some investigation and testing to determine the temperature of your ground water. For example, you may set the entering temperature to 50 degrees Fahrenheit and the target departing temperature to 100 degrees Fahrenheit. In this scenario, a tankless water heater with a temperature increase of 50 degrees Fahrenheit would be appropriate. Based on an average ground water temperature of 50 degrees, the following are the sizes of tankless units you would require based on your usage: You’ll need at least 3.5 GPM to run 1 – 2 fixtures at the same time.
  • If you want to run two or three fixtures at the same time, you’ll need at least 5 GPM.
  • If you want to run three or four fixtures at the same time, you’ll need at least seven GPM.
  • If you want to utilize five or more fixtures at the same time, you may require additional tankless units to be installed in succession.

Making a Decision

We hope that this information has assisted you in better understanding the many elements and sizes to consider when selecting a new water heater.Total Home Supply has a wide range of water heaters, including both storage tank and tankless models, all of which are eligible for free shipment to anywhere in the contiguous United States of America.Please get in touch with us if you require any more assistance before making your purchase.Our in-house specialists would be pleased to assist you in selecting the most appropriate unit for your water heating requirements.

What Size Water Heater Do I Need?

  • That is an excellent question. What is the solution? It is necessary to determine how much hot water you use on a regular basis during your busiest ″hot-water-using″ hour in order to get an accurate result. However, if you simply want a rough estimate of the size you require (rather than a precise calculation), the following rules should be followed: Approximately 30-40 gallons per person
  • 40-50 gallons per person for 2 to 3 people
  • 50-60 gallons for 3 to 4 people
  • 60-80 gallons per person for 5 or more people

We’ll explain why the numbers in the table above are only ″rough estimates″ and why they may not be precise enough to satisfy your hot water requirements.We’ll also demonstrate how to calculate the precise water heater size that will fulfill your requirements (and saves you money).Please be advised that this essay will focus on the size of tank water heaters.If you’re considering a tankless water heater but aren’t sure what size to choose, check out our blog post on tankless water heater sizes.Looking for a plumbing company that will expertly size and install a water heater that is ideal for your house?

Simply get in touch with us and we’ll take care of everything.

Only need a loose estimate for now? Start here…

  • Homeowners may simply require a general understanding of water heater dimensions in order to obtain a better sense of how much their water heater installation will cost in order to budget accordingly. Prediction: the size of your water heater has a direct relationship with the cost of running it
  • the ″larger″ your water heater, the more expensive it is to run it. Depending on how many people live in your household, you may estimate the size of the dumpster you’ll need (see below). Warning: The values in this chart are intended to be used as very broad guides only, and they may not exactly reflect your hot water requirements. The same 30-gallon tank water heater might comfortably serve a family of 5 or more people, yet the same tank water heater might not be adequate to meet the demands of a home of two people (or less). As you can see, the size of the tank you require is entirely dependent on your hot water use patterns. If you consistently use three or more hot water appliances in the same hour, you may require a tank that is significantly larger than the one shown in the table above. In contrast, if you only seldom use more than one hot water device at the same time, you may only want a considerably smaller tank. That being stated, before purchasing a water heater, you should be certain that the tank capacity is appropriate for your needs. The reason behind this is as follows: A water heater that is too small could result in never having enough hot water and/or a water heater that is overworked, resulting in frequent repairs or premature breakdown
  • a water heater that is too large could result in higher-than-necessary energy bills (for heating water that you don’t even use)
  • and a water heater that is too large could result in frequent repairs or premature breakdown.
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Are you ready to find out what size water heater you require? Take a look at this…

Want to know the exact size water heater you need? Do this.

1. Determine which hour during a typical day is your busiest “hot-water-using-hour”.

To figure out what size water heater your home need, you must first figure out how much water is used during ″peak hour demand.″ Peak hour demand refers to the largest quantity of hot water you use (measured in gallons) during the busiest hour of your normal day, which is usually the morning.Keep in mind that showers, out of all hot water activities/appliances, are the ones that consume the most hot water.That being said, if everyone in your home showers in the mornings on a regular basis, your ″peak hour″ is most likely to occur around this period.

2. Use the chart below to add up the gallons of hot water you need during this hour.

You should consider all of the hot water activities that you would ordinarily fit into that specific hour once you’ve identified which hour is your busiest hour. To determine your approximate peak hour usage for electricity, utilize the chart below. Source

3. Find a water heater that has a “first hour rating” within 1-2 gallons of your peak hour demand.

Every water heater is equipped with an FHR (first hour rating).Using a full tank of hot water as a starting point, this number represents the amount of gallons of hot water the unit can supply in a single hour of operation.So, in general, if your FHR and peak hour demand are the same, your water heater will provide enough hot water to suit your demands.If you’re visiting a manufacturer’s website, you can discover the FHR of a water heater under the ″specifications,″ ″features,″ or ″performance″ sections, depending on the manufacturer (see below).Source If you’re looking at the water heater tank itself, the FHR is mentioned in the top left corner of the EnergyGuide label in the top left corner of the EnergyGuide label.

It will be referred to as the ″Capacity (first hour rating)″ in the report.Source

Need help from a Florida plumber?

Simply get in touch with us. Upon request, we will provide you with a free estimate in which we will determine the precise tank size you require. For more than 50 years, we’ve been providing high-quality water heater installs in Florida, all of which are guaranteed by our 100 percent satisfaction guarantee! View a map of our service area in Florida.

Related reading:

  • Which is better, repairing or replacing my old water heater? Which is better, repairing or replacing my old water heater? There are three things to keep in mind:

What Size Tankless Water Heater Do I Need? (For Family Of 2,3,4,5,6)

An expensive tankless water heater that is not powerful enough to meet our demands is one of the most common blunders people make when purchasing a tankless water heater.Tankless heaters should not be purchased based on their size.Neither should they be purchased based on their size, since this will waste energy.The size of your tankless water heater should be as close to your household’s hot water requirements as feasible.In what size tankless water heater do I need to invest my money?

In order to determine how many GPM tankless water heaters I require for the gas unit and how many kW I require for the electric unit, I must first determine how many GPM tankless water heaters I require for the gas unit.Here’s how it works: Before you can accurately answer the question of what size tankless water heater you require, you must first determine two things:

  1. What is the greatest amount of hot water you require?
  2. What is the maximum amount of water per minute (measured in Gallons Per Minute or GPM) that a particular tankless water heater can heat, and by how many degrees?

It is necessary to establish a preliminary estimate of our maximal hot water requirements at any given point in order to properly design the tankless water heater.From 9 11 p.m., most families have the greatest demand for hot water.That is the time of day when we shower, brush our teeth under a hot faucet, and perhaps even have the dishwasher on.We need to keep track of how much hot water we’re using.

Here’s a handy table that shows how many GPMs are required by different types of water fixtures:

Fixture Gallons Per Minute (GPM)
Shower 2.0 – 3.0 GPM
Faucet (kitchen, bathroom) 1.0 – 2.0 GPM
Dishwasher 1.5 – 2.0 GPM
Washing Machine 2.0 – 2.5 GPM

For example, if you’re taking a shower (with 100 percent flow and 110°F hot water) and concurrently using two faucets (both with 100 percent flow and 110°F hot water), you’ll need a tankless water heater with at least 5 GPM flow rate.It is possible to get anything from 2 GPM to 12 GPM of hot water using a tankless heater.How many gallons per minute do you require?The ones with a flow rate of 5-10 GPM are the most suitable for the majority of houses.As previously stated, the cost of a tankless water heater grows in direct proportion to the capacity of the unit.

It should be noted that electric tankless hot water heaters are suited for modest water demands up to 8 GPM.Choosing one of the top gas tankless hot water heaters from this list is recommended for larger requirements (8 GPM or more).

Difference Between Maximum Water Flow And Realistic Maximum GMPs

When comparing the specifications of different tankless heaters, you will see that they all list the maximum GPMs.When it comes down to it, the highest GMP that your tankless heater will truly reach might be far lower.What is the source of the discrepancy?Because the maximum water flow in GMP is calculated by heating water to 77 degrees Fahrenheit, The inlet temperature of the water that is currently in your pipes is quite important.For example, in south Texas, the inflow water temperature is 77 degrees Fahrenheit.

In Minnesota, for example, the temperature of the input water might be as low as 37 degrees Fahrenheit.That represents an additional 40 degrees Fahrenheit differential that a tankless water heater must overcome.Calculation in a few words: Consider the following scenario: we have a tankless heater with a maximum water flow of 10 GPM.Because the input temperature is 77 degrees Fahrenheit in Texas, we can really obtain 10 GPM of 110 degrees Fahrenheit water.The heater must heat water from 77 degrees Fahrenheit to 110 degrees Fahrenheit, a difference of 33 degrees Fahrenheit.

In Minnesota, on the other hand, the inlet water temperature is 37 degrees Fahrenheit.In order to heat water to 110 degrees Fahrenheit in Minnesota, a tankless heater must overcome a temperature differential of 73 degrees Fahrenheit, rather than the 33 degrees Fahrenheit difference in Texas.You don’t come from Minnesota or Texas, do you?Here’s an infographic developed for the Rinnai RU160iP SE+ Series 9 GPM tankless water heater that will give you an idea of what the maximum water flow rate is in your state (legal for the United States of America).

  1. An additional example based on the infographics shown above is as follows: If you reside in Florida (inlet temperature of 77 degrees Fahrenheit), the Rinnai RU160iP SE+ Series tankless heater will have a maximum water flow of 7.1 GPM at its maximum temperature.
  2. The water pressure is sufficient to run numerous showers at the same time.
  3. If you reside in New York, on the other hand (with an intake temperature of 52 degrees Fahrenheit), the same tankless water heater may deliver a maximum water flow of 4.5 GMP.
  1. That is a direct outcome of the temperature differential between the input and outlet.
  2. In New York, the heater must contend with an additional 25 degrees Fahrenheit.
  3. You will be able to operate two or three showers at the same time using the same heater and the same amount of energy consumption.

It’s important to consider the operating costs as well, especially with larger units.You can find out how much power larger electric tankless water heaters consume by visiting this page.The amount of propane that these on-demand hot water heaters consume is another useful piece of information regarding propane units to read.

What Size Tankless Water Heater Do I Need For A Family Of 2, 3, 4, 5, Or 6?

When it comes to tankless water heater sizing, one of the most often asked topics is how much of a unit you need for a household of multiple people.Obviously, a tankless water heater designed for a family of three will be smaller than one designed for a family of five.But what are the specific GPM (for gas-powered engines) or kW (for electric-powered engines) figures?Because of the changing temperature of the water entering the tankless hot water heater, determining the correct size of the tankless hot water heater is difficult.A table containing estimations may be seen below.

Unfortunately, the confidence ranges are extremely wide.Those in the Northern United States will require larger units than homes in the Southern United States, for example, as follows:

Number Of Family Members: Gas Tankless Heater Size (GPM) Electric Tankless Heater Size (kW)
What size tankless water heater do I need for a family of 2? 6-8 GPM 10-18 kW
What size tankless water heater do I need for a family of 3? 7-9 GPM 15-23 kW
What size tankless water heater do I need for a family of 4? 8-10 GPM 20-28 kW
What size tankless water heater do I need for a family of 5? 9-11 GPM 25-34 kW
What size tankless water heater do I need for a family of 6? 11+ GPM 34+ kW

These data are provided just as a point of reference. The size of your tankless water heater is determined by a number of crucial criteria, such as the temperature of the water entering the tank and the amount of hot water you use on a regular basis.

Looking At Specifications Sheets

It is common to find manufacturers specifying a maximum water flow number in GMP or a maximum electric power number in kW on specification documents for their products.The GMP number for gas-powered tankless water heaters is often found on the product label, whereas the kW number for electric tankless water heaters is found on the product label.As we’ve shown, the maximum GMP is a function of context.It is dependent on where you live in the United States (because that affects the inlet water temperature).Power, on the other hand (measured in kW), is absolute.

Comparing the maximum wattage of different tankless heaters (as we have done in the table of the best tankless heaters below) allows us to determine how powerful they are in comparison.All things considered, you must also consider certain financial calculations, for example.It is advised that you check here to see if a tankless water heater is actually worth the investment (we did some calculations).Let’s take a look at two real-life situations.For example, if you want to replace your current 50-gallon water heater, the first question you should ask is what size tankless water heater you need.

Second, the number of people who live (and utilize) hot water in your home is taken into consideration.What size tankless water heater would be appropriate for a household of five, for example.

What Size Tankless Water Heater Do I Need To Replace A 50 Gallon Water Heater? (Example1)

  • Here’s how things work in this situation: You now have a tank-style water heater that holds 30, 40, 50, or even 80 gallons of water and wish to upgrade to a tankless water heater. The most significant distinction, of course, is that a water tank provides, say, 50 gallons of hot water, but a tankless water heater provides water heating on demand. For example, during a typical 10-minute shower, you use around 10 gallons of hot water on average. Taking 3 showers, running a few of faucets, running a dishwasher, and so on will easily deplete those 50 gallons in no time. When it comes to tankless water heaters, though, things are a little different. Instead of storing hot water, the tankless heater’s strong heating exchanger warms the water as it is needed, up to a particular maximum GMP limit, depending on the model. You would, roughly speaking, require the following items to replace a 50-gallon water heater: a 10 GPM gas tankless heater or at least a 27 kW electric tankless water heater if you live in the northern part of the United States
  • a 7 GPM gas tankless heater or at least an 18 kW electric tankless water heater in the southern part of the United States
  • and a 50-gallon water heater replacement kit.

As a result, Rinnai, the world’s leading manufacturer of gas tankless heaters, provides a broad range of models ranging from 7 GPM to 11 GPM: Please keep in mind that this is simply an approximate estimation. The prudent course of action is to get a tankless heater that is somewhat more powerful than the anticipated need. It is preferable to be safe than sorry.

What Size Tankless Water Heater Do I Need For A Family Of 5? (Example2)

If five individuals reside in the same house, they can use multiple faucets or showers at the same time.This must be taken into consideration while determining the appropriate size of a tankless water heater.Showers are the home hot water user that consumes the most hot water the fastest.5 persons can also operate many hot water taps at the same time, as well as a dishwasher and do laundry, among other things.In summary, if you live in the northern portion of the United States, where the input water temperature is lower, you would require a 10 GPM gas tankless heater or a 27 kW electric tankless heater.

The tankless heater needs to work extra hard to raise the water temperature to 110°F or 120°F, depending on the situation.For those who reside in the southern part of the country, the tankless water heater’s capacity might be lowered by up to 30 percent.As a result, for a family of five in the southern United States, a 7 GPM gas tankless heater or an 18 kW tankless heater should be more than adequate to meet all of their hot water demands.Keep in mind that, especially with larger units, tankless water heater circulation pumps can save you a significant amount of money on hot water.These pumps come in handy when you need hot water from a faucet or shower in a short amount of time.

You won’t have to wait for hot water to start flowing, squandering all of the cold water that would have been wasted in the meanwhile.

How Many Tankless Heaters Do I Need?

This is a rather typical topic, especially when it comes to larger homes.Here’s how it works: In the majority of situations, one tankless heater is sufficient to heat an entire house.For those who live in really large homes (2 or more bathrooms), even the largest Rinnai gas tankless water heater with a flow rate of 11 GPM will not be adequate to meet all of their simultaneous hot water demands.It makes logical in these situations to install two tankless water heaters.The most common combination is as follows: The largest gas unit (11 GPM, 199,000 BTU) and the largest electric unit The large tankless water heater meets the majority of the household’s hot water requirements.

During times when we require a large volume of hot water, the electric tankless water heater is activated to provide assistance.Alternatively, you might utilize two units for different parts of the home, one for one section and another for the other section of the house.Specifically, the plumbing for each units is separate in this instance.I hope this has been of assistance.

How many gallon water heater do I need for a family of 5?

Based on the number of people living in the residence, you may estimate the required tank capacity (in gallons) as follows: 23 to 36 gallons per person for one or two individuals. 2 to 4 individuals require 36 to 46 gallons of water. 3 to 5 individuals require 46 to 56 gallons of water.

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How long does a 50 gallon water heater last?

Several factors influence the lifespan of a 50-gallon water heater, as listed below. The heating element of an oil or gas water heater has a normal life expectancy of 8 to 12 years, depending on the manufacturer. Electric tankless water heaters, on the other hand, may provide hot showers for up to 18 to 20 years, depending on the model.

What size residential water heater do I need?

Sizing a Residential Water Heater – A Guide

Family Size Demand Gallon Capacity
1-2 people High Regular/Low 40 to 50 gallons 30
2-3 people High Regular/Low 40 to 50 gallons 40
3-4 people High Regular/Low 50 to 75 gallons 40
5+ people High Regular/Low 75 gallons 50 gallons

How many showers can you get out of a 50 gallon water heater?

Showering for 8 minutes is considered a national average, thus a 50-gallon water heater will provide enough water to take two showers. Based on a 17-minute hot water run time at 2.1 gallons per minute shower head flow calculation from a 50-gallon water heater, as well as other assumptions.

How big of a water heater do I need for a family of 4?

A 50-gallon capacity tank (electric) or a 40-gallon capacity tank (gas) will enough if your family’s size is between three and four people (natural gas or liquid propane). In order to accommodate a family of five or more people, you’ll need an 80-gallon tank (electric) or a 50-gallon tank (natural gas or liquid propane).

How big is a 50 gallon water heater?

Keep in mind that only 70% of the hot water stored in the heater’s tank is really accessible for usage at any given time (50-gallon tank size has 35 gallons of hot water for use). The following computation is based on a family of four members:

How big does a solar water heater need to be?

Active systems have a solar storage tank that grows in capacity in proportion to the size of the collector — generally 1.5 gallons per square foot of collector for active systems. When the demand for hot water is minimal, this helps to keep the system from overheating and breaking down.

How big of a wire do I need for a hot water heater?

Current and wire gauge sizes that are often used.Installing a hot water heater requires the use of wire that is large enough to handle the current demand of the heater.Typical hot water heater sizes are as follows: a 20-amp hot water heater requires 12-gauge wire, a 25-amp hot water heater requires 10-gauge wire, and a 30- to 40-amp hot water heater requires 8-gauge wire.To view the complete response, please click here.

Water Heater Sizing Calculator: What Size Water Heater Do I Need?

It is not always simple to determine the proper size of a water heater. It is very typical for people to make the following mistakes when selecting a water heater capacity for a household of 2, 3, 4, 5, or 6.

  1. Purchasing a water heater that is too small (undersizing). If the capacity of your water heater is insufficient, you will most likely run out of hot water while bathing. An illustration of a water heater that is too small: For a household of five, a 30-gallon water heater is being installed. That equates to more than half of the water heater capacity that you actually require.
  2. Purchasing a water heater that is too large (oversizing). If your water heater’s capacity exceeds your hot water requirements, you will incur unnecessarily higher water heater expenses. An example of a water heater that is overly large: Water heater installation for a two-person family of sixty-gallons. That is almost 20 gallons more than you require, and you have unnecessarily spent an extra $150 dollars on the heater as well as wasted space.

Neither of these mistakes can be made if you know how to correctly select the appropriate water heater capacity for your hot water requirements.The problem is this: When it comes to sizing your water heater, you only have one chance.You don’t want to make the mistake of purchasing a unit that is either too large or too tiny.The next section will discuss how to choose the appropriate water heater size for your home.This comprises elements that raise or decrease the amount of water heater capacity that is necessary (size of your family, hot water needs, etc.).

Our basic rule of thumb for sizing any water heater is included (it’s quite simple to use, but you must accurately predict your peak hour hot water use).On top of that, we created a ‘Water Heater Sizing Calculator’ to make sizing a water heater as simple as possible.You just enter the size of your household and the amount of hot water you want, and the calculator will provide a general estimate of the size of water heater you will require based on your normal hot water usage.The following is an example of what the results look like (screenshot): Consider the terms ″first hour rating,″ ″water heater capacity,″ and ″peak hour hot water demand″ in order to get more familiar with water heater size principles in general.With this understanding, you will be able to readily comprehend the following table, which contains water heater sizes for families of 1, 2, 3, 4, 5, and 6 members:

How To Estimate The Size Of A Water Heater You Need?

The capacity rating of a water heater is a critical specification that allows us to properly size a water heater.Water heaters with capacities of 30 gallons, 40 gallons, 50 gallons, and 60 gallons are discussed.The ‘water heater capacity rating’ is the number of gallons that the water heater can hold.This is frequently referred to as the ‘first hour rating.’ When starting with a tank full of hot water, it is the volumetric quantity of hot water that a heater can provide within the first hour of operation.What is the first hour rating and how can I find out?

Simple.In accordance with FTC (Federal Trade Commission) regulations, every conventional storage water heater manufacturer is required to display this rating on the EnergyGuide label.Simply look at the label to determine the real size of your water heater.The following is a general rule of thumb for sizing a water heater: Rating for the first hour (Heater Capacity) Demand During Peak Hours (We shower for an average of 1 hour.) In other words, your water heater should be large enough to handle your household’s most stringent 1-hour hot water demands at the very least.As an illustration, three persons take a shower from 10 PM to 11 PM.

We utilize 20 liters of hot water in a single shower (according to US Energy Saver).That implies you’ll need a water heater with a capacity of at least 60 gallons.As we shall see later, the actual size of a water heater is determined by the amount of hot water you require.The size of your family can be approximated by this number.

  1. As an illustration, a family of five will need less hot water than a family of three.
  2. It is important to note that after the first hour (when we started with a tank full of hot water), the output of a water heater is influenced by three key elements.
  3. These are the ones:
  1. Heat source (gas versus electricity)
  2. this might be a burner (gas water heater with tank) or an element. Capacity of the water heater tank (electric water heater with tank). Electric water heaters are the topic of discussion.
  3. The size of the aforementioned heat source, that is, the size of the burner or the size of the element

Of course, after the first hour, any water heater will be able to provide less hot water in the 2nd, 3rd, and so on hours after the first.For example, if you have a 50-gallon water heater with a first-hour rating of 50 gallons, you will receive 50 gallons of hot water during the first hour of operation.However, it is likely that you will receive far less than 50 gallons of hot water in the second hour (about 16 gallons on average in this case).To determine how much hot water we will require during our peak showering hours, we must first determine how much hot water we will require during the preceding rule of thumb for sizing a water heater.Here’s a little assistance in accomplishing that goal:

Estimating Peak Hour Demand: This Is The Key Step

  • In principle, sizing a water heater is quite straightforward (using the rule of thumb). Simply put up all of the hot water you’ll need during the most intense hot water hour of the day. That is often the time of day when a substantial proportion of the entire household showers. It is recommended that the size of the water heater correspond to that capacity, with an additional few gallons added on top of it. The most important task now is to make an accurate estimate of the peak hour hot water demand. This implies that you must tally up all of the hot water you used within that hour, including bathing, brushing your teeth, hand washing, shaving, dishwashers, and other household appliances like dishwashers. In order to assist you, we have included below some of the most typical tasks that necessitate the use of hot water, along with the hot water requirements: Showering consumes 20 gallons each shower
  • brushing teeth consumes 0.5 gallons
  • hand washing consumes 3 gallons
  • shaving consumes 2 gallons
  • top-loading clothes washer consumes 25 gallons
  • H-Axis clothes washer consumes 15 gallons.

In reality, here’s an example of how to estimate the peak hot hour requirements in advance.Consider the following scenario: you have a four-family home with two bathrooms.The family takes a shower from 10 PM to 11 PM, one person shaves, and all four family members brush their teeth at this time.It takes 320 gallons (3 showers) plus 12 gallons (for shaving) and 40.5 gallons (for brushing teeth) to equal 64 gallons of hot water.The capacity of your water heater must be at least 64 gal.

in order to meet this requirement.In this situation, a 70-gallon water heater is widely available, but a 60-gallon water heater will most likely be too little for your needs (undersized).In most cases, an 80-gallon water heater for a household of four is excessively large.If you use this ‘peak hour demand’ rule of thumb to predict your hot water requirements, you will have a little wiggle room in the higher direction.You may increase the capacity of your water heater by approximately 10% to 15% beyond the predicted capacity.

That implies that if you estimate your peak hour hot water use to be 64 gallons, you may get away with a 70-gallon water heater.However, you should avoid selecting a water heater with a reduced capacity.In practice, if you anticipate that you use 64 gallons of hot water during peak hours, you should purchase a water heater with a capacity of 64 gallons or greater.Never get any smaller.

  1. It is important to note that undersizing a water heater will cause more problems than oversizing a water heater.
  2. Don’t be concerned if all of this appears to be a bit complicated.
  3. There is a more straightforward method of determining the size of a water heater.
  1. It is founded on three fundamental principles:
  1. Average hot water use per person per hour, depending on the size of the family. Approximately 10 gallons of hot water are consumed every hour by the average human, according to Engineering Toolbox. Of course, we’re talking about the demand during peak hours.
  2. The average home uses 15 to 20 gallons of water on a daily basis. Regardless of the number of people that reside in the house, every household has certain fundamental hot water requirements.

Based on these three concepts, we can make an educated guess as to what size water heater you will require based on the size of your family:

Water Heater Sizing Calculator (Based On Family Size)

Calculator to determine what size water heater you require.It will provide an approximate estimate of the size of the water heater that you require.To use the water heater capacity calculator, simply enter your family size and hot water requirements (below average, average, or above average), and the water heater capacity calculator will dynamically calculate the water heater capacity in gallons: On the basis of this technique of water heater sizing, you may get an approximate idea of what size water heater you need for your family:

Family Size Water Heater Size (Gallons)
Family of 1 25 Gallons
Family of 2 35 Gallons
Family of 3 45 Gallons
Family of 4 55 Gallons
Family of 5 65 Gallons
Family of 6 75 Gallons

When purchasing a water heater, keep in mind to look for the Energy Star logo as well. Water heaters that are energy efficient pay for themselves in the majority of situations. You may learn more about the requirements for receiving an Energy Star designation by visiting this page. We hope you found this information to be useful.

Solved! How to Select the Right Water Heater Size

  • Major Systems

If a new water heater is in your future, take some time to figure out whether the size of your current heater meets your needs. These pro tips will walk you through the process.

Image courtesy of Q: Our water heater is nearing the end of its useful life.I’ve turned up the temperature on the tank to its highest level, but the water that comes out of the faucet is no longer hot at all.It is therefore necessary to purchase a new water heater.Our present tank has a 30-gallon capacity, which was plenty when we purchased the property ten years ago.However, our family has expanded, and we are now consuming more water for bathing and laundry than before.

What type of water heater do I require?A: Based on your description, it appears that you will require a bigger water heater this time around.And you’re absolutely correct: Increased people in the family means more water consumption.As a result, ″the number of users is critical for tank-style water heaters since the output is more or less fixed,″ says Daniel O’Brian, a technical specialist for online plumbing shop″The output is more or less set,″ he adds.

Whether you’re looking to replace your old water heater with a tank or a tankless type, O’Brian can help you choose what size water heater would best match your needs and budget.

For a tank-style heater, household size is a simple indicator of hot water needs.

  • Based on the number of people living in the residence, you may estimate the required tank capacity (in gallons) as follows: For one or two people, 23 to 36 gallons are needed, for two to four people, 36 to 46 gallons are needed, and for three to five people, 46 to 56 gallons are needed
  • for five or more people, more than 56 gallons are needed (add 10 gallons for each extra person).

A 40-gallon water heater, such as A. O. Smith’s ProLine Power Vent Gas Water Heater (available from SupplyHouse), should be sufficient for the average household of four. However, it should not be your only factor to consider. It is possible to obtain a more realistic picture of your family’s hot water requirements by delving a bit further.

In addition to tank capacity, consider a water heater’s first hour rating.

  • When a tank is fully heated, the first hour rating (FHR) specifies how much hot water it can generate in a single hour when fully heated. At peak consumption, this statistic indicates the appliance’s efficiency (how rapidly the water heater can reheat the water) and provides an indication of how much water it can manage in a given amount of time. If you buy a 50-gallon A. O. Smith ProLine Power Vent Water Heater (available at SupplyHouse), it has an FHR of 90 gallons, which means it can deliver up to 90 gallons of hot water in an hour. You want to seek for a hot water heater that can provide the number of gallons of hot water required for all of the activities that might be carried out concurrently during the busiest time of the day, or even more. Make use of the statistics in the table below to help you predict peak hour use and establish the best FHR for your situation. Bathing or showering (per person) requires 20 gallons
  • washing hair (per person) requires 6 gallons
  • washing hands (per person) requires 2 gallons
  • washing dishes by hand requires 6 gallons
  • shaving requires 3 gallons
  • running the dishwasher requires 14 gallons
  • running the clothes washer requires 30 gallons.

Consult with a professional Find qualified plumbing professionals in your area and receive free, no-obligation estimates for your plumbing project on HomeAdvisor. + Image courtesy of

If a larger tank won’t fit in the existing space, consider a tankless heater.

Tankless heaters, which are often wall-mounted, are able to fit into smaller spaces since they do not require a large storage tank, as O’Brian points out.Typical tank water heaters may be up to six feet tall and 22 inches in diameter, with a capacity of 50 gallons.In contrast, a tankless water heater that produces equivalent output (for example, the Takagi Tankless Natural Gas Water Heater (available from SupplyHouse)) is just 20 inches high, 14 inches wide, and less than ten inches deep (see Figure 1).If you have a limited amount of available space, a tankless water heater may be the best option.Image courtesy of

To select the right tankless water heater, estimate the necessary flow rate based on hot water usage and the required change in temperature.

Tankless water heaters do not have a storage tank to hold hot water. Instead, they heat it only when it is required. ″Flow rate is the most important factor to consider when sizing a tankless water heater,″ O’Brian explains. The following information will assist you in estimating the flow rate requirements for your family.

To begin, figure out how much hot water you use during peak hours. Peak consumption is defined as the period of time during which you consume the largest amount of hot water. You may use the following table to calculate the maximum amount of hot water you would consume at one time based on the typical flow rates (per fixture) in gallons-per-minute (gpm):

  • Water flow rates for sink faucet: 1 gpm
  • bathtub: 3 gpm
  • shower: 2.5 gpm
  • dishwasher: 3 gpm
  • clothes washer: 3 gpm
  1. You’ll need a tankless water heater with a minimum flow rate of 5.5 gpm if, for example, your peak consumption comes after dinner when you’re running the dishwasher and having a shower at the same time (three gallons per minute plus two and a half gallons per minute).
  2. Next, find out what the temperature of the water is that is entering your home. Simply turn on a cold water faucet and allow it to flow for a couple of minutes before measuring the temperature of the cold water using a thermometer.
  3. To calculate the needed temperature rise, subtract the cold water temperature from 110 degrees Fahrenheit (the typical home hot water temperature) and multiply the result by 100. For example, if the cold water temperature is 65 degrees Fahrenheit, the water heater will need to heat the water 45 degrees Fahrenheit in order to reach 110 degrees Fahrenheit, resulting in a temperature rise of 45 degrees Fahrenheit being required.
  4. Increase the flow rate by the amount of temperature rise that is necessary. As O’Brian points out, ″all units should be equipped with a chart that depicts the flow of hot water at various temperature increases.″ One such tankless water heater, the Takagi T-D2-IN Natural Gas Tankless Water Heater (available through SupplyHouse), has a maximum flow rate of 10 gpm, with the emphasis on the term ″maximum.″ The Takagi has an efficient flow rate of 10 gpm in a warm area where just a temperature increase of 20 degrees is required. Alternatively, if you require the water heater to raise the temperature of the water by 45 degrees Fahrenheit, the flow rate drops to around 7 gpm, as stated on the flow rate chart given by the manufacturer.

Check out this video from SupplyHouse on how to properly size tankless water heaters for a more visual explanation.It is with great pleasure that brings you this is the source of the information and viewpoints presented.Consult with a professional Identify qualified plumbing professionals in your area and receive free, no-obligation estimates for your plumbing project.+

Sizing Guide: What Size Water Heater Do I Need for My Home?

When it comes to water heaters, the typical lifespan varies depending on the sort of system you have.However, the kind of water available in your location will have an influence on the performance of your water heater system.A conventional gas water heater is designed to last between 8 and 12 years, depending on how well it is maintained.An electric water heater, on the other hand, is meant to have a life cycle of 10 to 15 years, depending on the manufacturer.Your water heater may need to be replaced if it is leaking or making loud noises.

A new energy-efficient system may be the best option.It’s crucial to become familiar with the different water heater sizes available before making a decision on which system to purchase.

Water Heater Sizes

What size water heater do you require to meet the needs of your household?If you have a large number of children, the answer to this question will be different for each one.For example, a household of three to four people should acquire a water heater that holds 50 to 60 gallons.A home of 5 to 7 people, on the other hand, may require a water heater with a 60 to 80 gallon water tank.An 80 gallon water heater will offer you with adequate hot water to shower, do laundry, and wash dishes if you live alone with your spouse.

These are approximate measurements for your residence.The size of your water heater will be determined by a variety of factors, including the number of people in your household and the length of time you spend in the shower on average.

Hot Water Usage Habits

The procedure of determining the appropriate size for a water heater will vary from family to family.If a family of 5–7 people lives in a 60–80 gallon water heater, for example, this may not be necessary.If you have a household of this size, a 50 to 60 gallon water heater may be sufficient for your needs in some instances.In addition, a water heater with a water tank that is bigger than 30 gallons may be required for a household of two people.It is dependent on your water use patterns that the size of your water heater will be determined.

In the event that you frequently use two to four water appliances at the same time, you should consider purchasing a larger water heater to guarantee that you have enough warm water to shower while the appliances are running.The process of determining the appropriate size of a water heater for your home is quite crucial.Purchase a water heater that is too tiny, and you may find yourself needing to take a shower with cold water.As an added bonus, a water heater that is too small for your household will have to work harder to keep up with your demands.This will result in the need for expensive repairs and tune-ups.

Alternatively, a water heater that is too large for your home may result in a rise in the overall cost of your energy bills.If you need assistance choosing what size water heater you require, contact a local specialist in your region who can assist you in identifying the most appropriate type for your home.To find out more, see What Size Condensing Furnace Do I Require?

How to Determine How Much Water You Use

While the estimations provided above can be used to get an approximate idea of the amount of water heater you will want, there is a more exact technique of determining the size of a water heater.First and foremost, you must examine your water use patterns in order to estimate your peak water consumption hour.If your family showers from 8:00 9:00 a.m.every morning, this is the time of day when you use the most water.

You’ll need to figure out how many gallons of water you use throughout this period of the day to be accurate.The average quantity of warm water used for showering is 10 gallons per person each day.Showering in the morning for a total of 5 members of your home will require you to multiply 10 gallons by the total number of water use sessions, which in this case is 5.This means that a family of five would consume 50 gallons of water each morning from 8:00 9:00 a.m., assuming that they were in the shower at that time.

However, it is probable that you will consume more than 50 gallons of water to wash the dishes from your meal.When it comes to cleaning your dishes, a conventional dishwasher uses a total of 6 gallons of water to remove oil and food.Your total water use will be equivalent to 56 gallons once you have finished washing your dishes, assuming that each member of your household takes a shower.Additionally, if you opt to wash laundry in the morning, you will need an additional 7 gallons of hot water in the process.

  1. 63 gallons of water have been consumed by your family after everyone has done bathing, cleaning dishes, and doing laundry.
  2. This means that you will need to invest in a water heater with a tank capacity of 60–80 gallons in order to avoid running out of hot water every morning.
  3. The First Hour Rating (FHR) of a water heater should be more than the entire volume of water consumed during your highest water usage hour, which you should look for while comparing different water heater sizes at the store while shopping.
  1. The FHR rating of a water heater specifies the total number of gallons of warm water that it is capable of producing in one hour.
  2. This rating may be obtained on the website of the manufacturer.
  3. In order to determine the FHR Rating of your present water heater, you must first locate the EnergyGuide label on the unit.

It will be situated at the top of this sticker on your water heater, and it will read ″FHR Rating.″ More information may be found at: Reasons Why It’s Critical to Replace Your Lead Pipes

Other Factors to Consider While Sizing Water Heaters

The size of your water heater may be increased if one or more persons in your household choose to take a bath in the morning instead of showering.A basic little bathtub has a capacity of 40 gallons of water on average, which is plenty for most people.A huge bathtub, on the other hand, may be able to accommodate up to 140 gallons of water.We propose that you have your children reuse the same bathwater in order to save money on your water costs.If you choose to acquire a tankless water heater rather than a typical water tank, you will be required to follow a new set of rules when determining the appropriate size for your water heater.

A tankless water heater, in contrast to a standard water heater, is designed to heat incoming water from your pipes rather than producing vast amounts of warm water at once.The Flow Rate and Temperature Rise should be calculated in order to establish the size of the tankless water heater that you will require.It is important to understand that flow rate is a statistic that relates to the total amount of warm water that an individual will use every minute.Giant gallons are used to measure the entire volume of water.When it comes to temperature rise, on the other hand, it’s a meter that shows you how many degrees your water will need to be heated before it gets to your shower fixture.

If you want assistance in determining the appropriate size water heater for your home, please contact our staff at (484) 206-8594.Residents of Pennsylvania may rely on the qualified plumbers and technicians at WM Henderson to deliver reliable water heater repair, replacement, and installation services to their homes.We also provide a variety of additional services, including water line installation, air conditioning tune-ups, furnace repair, and drain cleaning.In addition to West Chester, Broomall, Coatesville, and Conshohocken, WM Henderson provides plumbing and HVAC services across Pennsylvania.

  1. Since 1977, we’ve been offering trustworthy plumbing, heating, and air conditioning services to people of the Commonwealth of Pennsylvania.

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