Tankless Water Heaters Waste Water Compared To Storage Heaters
As is well advertised, tankless water heaters save energy. Tankless water heaters do not have a tank full of water slowly leaking out heat energy 24 hours a day. Gas tankless water heaters usually don’t have standing pilot lights.
Endless hot water
One of the benefits, possibly the biggest benefit, is endless hot water. There are pros and cons to endless hot water. Some family members may end up taking much longer showers for instance, causing you to spend more on heating water than you would with a storage heater.
Tankless water heaters do not conserve water
With a tankless unit, there is no hot water ready and waiting to flow off to the tap. The water in the heat exchanger is cold. So first the water must be heated by passing through the heat exchanger, and then make it to the tap. It takes longer to get hot water to the fixture.
This means you are running more water down the drain while you are waiting for the hot water to reach the fixture, and finally stabilize at the desired temperature. Here is more information about tankless water heaters and wasting water. Tankless Water Heaters Test Results
A hot water demand system solves the problem
There is a fix; a hot water demand system would solve the wasted water problem. With a hot water demand system you won’t run any water down the drain, and you don’t wait as long either.
A traditional full time hot water circulating system with a return line from the last fixture back to the water heater will not work with most tankless water heaters and will probably void the tankless water heater’s warranty. It would either keep the heater on all the time, or it wouldn’t pump enough water to turn the heater on at all, depending upon the size of the pump.
By combining a tankless water heater with a demand type hot water circulating system you get the best of both worlds. You save energy and you save water. Perhaps best of all you save time since you don’t have to wait as long for your hot water.