Pexheat.com, Brian Whitehurst Using a Water Heater for Space Heating Part 1 Using a Water Heater for Space Heating Part 1** We at Pexheat.com get asked this question a lot. I would like to take this chance to outline some of the important details worth considering when select... 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