What size water heater do I need?
logo hot water heaters reviews

» Home
Water Heaters Types
» Reviews
» Best
» Electric
» Gas
» Solar
» Tank
» Tankless
» RV

Reviews by Brands
» American
» AO Smith
» Bosch
» Bradford White
» GE
» Noritz
» Paloma
» Rheem
» Richmond
» Rinnai
» Ruud
» State
» Takagi

Water Heating Help
» Parts
» Troubleshooting

Boilers
» Vaillant

Applications
» Radiant Heat
» Water Dispensers

About
» My Blog
» Privacy Policy
» Contact Me



[?] Subscribe To This Site

XML RSS
follow us in feedly
Add to My Yahoo!
Add to My MSN
Subscribe with Bloglines




What size water heater do I need?

by Joyce
(Milwaukee)

I am thinking between tank water heater and tankless unit. But with an abundance of info online I am confused.

Please suggest how to select the right water heater. I don't know how to size a water heater. Is it the tank capacity, water flow, or efficiency that will determine the appropriate unit size?

Comments for What size water heater do I need?

Average Rating starstarstarstar

Click here to add your own comments

May 17, 2010
How to size a water heater
by: Shridar

As you probably know, the first thing what you should do is to answer the following questions:

- What is the size of your family and for how many application you will use hot water? Determine is your family low demand or high demand.

- Do you have teenagers living with you as they use more hot water for shower and cloth washing?

- Do you have a whirlpool bath or tub? If the capacity of your tab is 75 gallons for example, your water heater should provide enough hot water which is 100 % or more of the tub capacity.

Here is the recommendation when sizing the tank type water heater; the heater's output requirement relative to the family size:

For 2-people family size you are looking at 45-55 gallon size water heater.

For 4 people you will need from 65 to 75 gallons water heater.

For the family size of over 6 people you need 85-gallon tank size and up.

Keep in mind that the size of the storage tank is not the only criteria when buying the water heater. On the EnergyGuide label you can find another, more important figure which is the first-hour rating. Estimate your household peak hour demand and find the water heater with the first-hour rating close to that number.

If you are looking for the gas water heater, first-hour rating is higher that electric, so what can happened, you can meet your needs with a unit with the smaller storage tank than an electric.

Next criteria you will use to determine what is the right water heater for you is the EF, energy factor. With the higher EF, water heater is more efficient.

And finally, the cost. What is the price for a new water heater, installation cost, maintenance cost and operating costs.

To size a tankless water heater you have to determine the flow rate and the temperature rise. Temperature rise is the difference between outgoing and incoming water temperature.

As you can see when sizing a water heater, you should not select and buy a water heater solely based on the capacity of its tank or flow rate.

Click here to add your own comments

Join in and write your own page! It's easy to do. How? Simply click here to return to Water Heater Review .




Copyright @ 2012. All rights reserved.