Ohio Water Heater Authority is an independent, privately owned water heater service company and a Transit & Flow™ company. We are not a government agency and are not affiliated with the State of Ohio or any public utility.
Gallons per minute measures flow. For tankless water heaters it describes how much water the unit can heat at a given temperature rise, so the same model delivers fewer GPM in winter than in summer.
In Central Ohio winter, incoming water can be around 42°F. Heating it to 120°F is a 78°F rise, which is the condition we size tankless units against. A unit that looks large at a 45°F rise can fall short in January.
Compare approaches in tank vs tankless.
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