Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

gpm on tank water heaters

Snowmelt
Snowmelt Member Posts: 1,415
in Plumbing
is there a chart or can anyone tell me instead of sizing water heaters to the gpm of whats needed is there a chart that can give an estimate of how much water comes out of lets say 2 - 75 gallon water heaters and 1 65 gallon storage tank. that way I can say with 2 - 75 gallon i can give you 250 gallons of water in an hour and with a stage tank i can give you ex amount of water.

Comments

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,517
    Look at the manufacturers instructions. There are many variables:

    Inlet domestic water temp
    Outlet domestic water temp
    DHW temp is usually figured at a 100 deg rise

    Then you have to look at the boiler side:
    variables are boiler water temperature
    TD on boiler water temp
    GPM flow

  • Larry Weingarten
    Larry Weingarten Member Posts: 3,289
    Hello, Tank type heaters should have a "first hour rating". It combines the stored hot water with what the unit can produce in an hour. That's your answer. ;)

    Yours, Larry

Categories