Pexheat.com, Brian Whitehurst Using a Water Heater for Space Heating Part 2 * * **Using a Water Heater for Space Heating Part 2** This is the continuation of a look into whether one can and should use a Water Heater to heat their house. Please see Part 1 for a look into heat ... flow rates heat load heat plant heating your house with a boiler,heating your house with a water heater larger tankless water heater selecting a heat source small tankless water heater water heaters and boilers Sep 24, 2021