How Do Tankless
Water Heaters Work?
Tankless water heaters are attached directly to your water line. The burner or heating element in your tankless water heater activates when you open a hot water tap, allowing the water to flow through. As water flows through the heat exchanger, it absorbs the heat and quickly reaches the preset temperature before traveling to the open fixture(s). Because of the direct heat exchange, tankless water heaters provide on-demand hot water.
Start by determining which kind of energy your home currently uses—electric or gas. Then, think through the size of your home and its number of residents. This will help you figure out the maximum hot water usage your home requires, so you can calculate your home’s required energy input.
Gas tankless water heaters can be installed almost anywhere in a home because they’re much smaller than traditional tank options. When choosing an installation location, remember that hot water arrives to fixtures like showers or sinks faster when it is located closer to those fixtures.
Gas tankless water heaters may use different vent configurations than gas tank water heaters. A professional contractor can help you navigate the best venting options for your unique home.