Simple Calculation for Determining Tankless Water Heater Size

 To determine the right size tankless water heater for your home or business, you can use a straightforward calculation:

  • Determine Your Desired Flow Rate: Add up the GPM of each fixture you expect to use at the same time.

    Example: 1 shower (2.5 GPM) + 1 dishwasher (1.5 GPM) = 4 GPM.

    • Calculate Temperature Rise: Subtract the incoming water temperature from the desired hot water temperature.

    Example: Desired temperature (120°F) – Incoming water temperature (40°F) = 80°F.

    • Match to Heater Output: Once you know the flow rate and temperature rise, match these numbers to a tankless water heater model capable of meeting those requirements. You can also use online tankless water heater size calculators.

    Consulting a local plumbing company can also help ensure that your system is sized properly and meets your household’s needs.

    Originally published here: https://www.whiteplumbingcompany.com/a-complete-sizing-guide-for-the-ideal-tankless-water-heater/


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