Do Tankless Water Heaters Need Expansion Tanks

The water expands as it heats and on a tank you are raising the temp of water trapped in the tank because the water continues to heat after the tap is closed but on a tankless the heating stops as the tap is closed or its suppoesd too so you do not need an expansion tank on a tankless.

Do tankless water heaters need expansion tanks.

New or larger expansion tanks may be needed due to pressure reducing valves check valves and backflow preventers added to the community s water system. As we discussed above a tankless water heater using a recirculation pump and a storage tank or water heater will need a thermal expansion tank to control thermal expansion inside the plumbing system. Below we ve highlighted what size water heater you would need in our example of 6 5 gpm at a 63 f temperature rise. You do need a releif valve so that if the heating does.

Most time no some time yes. Installing a tank water heater might seem easy but homeowners who refinish their basements often create a number of code violations with respect to the water heater. What type of water heater do you have. If you have a tankless water heater you don t have to worry about an expansion tank because you don t have a primary tank to begin with.

Simply locate the appropriate water heater sizes on ecomfort using your information. Electrical even gas water heaters have electrical parts and need to be hooked up to your breaker box. Sizing expansion tanks for water heaters can be a complex engineering challenge but residential expansion tank sizing has been simplified through the use of calculators. For a thankless water heater itself.

7 best rv tankless water heaters mini tank models. Code expert glenn mathewson describes 10 common water heater code issues including confusion about drip pans and drains unsupported expansion tanks and plastic vents lack of combustion air and more. Their is case were you need an expansion tank with a tankless system. Expansion tanks are required if your system fails a water pressure psi test.

This may seem like an easy question but it is also one that many people do not actively think about. By only heating water when it s needed tankless water heaters do not experience standby heat loss which occurs when heat escapes the water tank and needs constant reheating. In this system an unfired tankless water heater may need to recirculate in order to lessen the wait time or prepare for large hot water demands. However if you have a traditional tank style water heater you will most definitely need to consider if an.

If their is backflow prevention device check valve or other similar device installed on the cold water input.