Gallons per minute gpm is the key when it comes to sizing tankless water heaters.
Whole house electric tankless water heater sizing.
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Tankless water heaters are rated by the maximum temperature rise possible at a given flow rate.
Having a water heater that is too small will result in it not being able to produce enough hot water for your household demand.
In fact it is the most important part of choosing a new unit for your home.
Size matters when it comes to your tankless water heater.
If you want to upgrade your water heater size from 40 or 50 gallons storage water heater or replace it you won t necessarily need a big tankless water heater.
The right size is a tankless water heater that can heat enough gallons of water to a specific temperature per minute to keep up with the demand.
The lowest price you can get for the highest gpm is easily the takagi t h3 dv n that will give you a whopping 10 gpm.
For example you might not be able to run more than one shower at a time without someone getting an arctic blast of cold water.
Therefore to size a demand water heater you need to determine the flow rate and the temperature rise you ll need for its application whole house or a remote application such as just a bathroom in your home.