What Size Water Heater Expansion Tank Do I Need

If you have more than one heater on the same or connected system you can either have an expansion tank for each heater or a single larger expansion tank.

What size water heater expansion tank do i need. Pmc sizing chart for residential water heaters water heater capacity in gallons inletwater pressure 30 40 50 66 82 100. The first is your hot water heater s or boiler s capacity in gallons. For a tank style heater household size is a simple indicator of hot water needs. This can be a problem in any closed system where water is heated.

Expansion tanks are pre charged with a 38 psi air charge. What size expansion tank do i need. If the inlet water pressure is higher than 38 psi the expansion tank s air pressure must be adjusted to match that pressure but must not be higher than 80 psi. The first permit is for the water heater itself.

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. The decision will be based on two factors. The first of these will be the size of water heater that you have. Choosing the right size for your expansion tank.

You can look for this information on the factory label of the water heater itself. Before purchasing an expansion tank you should find out how large of an expansion tank your system will require. 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. You can estimate the necessary tank capacity in gallons based on the number of people in the house.

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. There will be two factors that impact the size of expansion tank that your house requires. Both water heaters and boilers for home heating systems can be prone to this kind of damage unless measures are taken to prevent it. You re only looking at 20 to 100 out of pocket as opposed to several hundred dollars to call in a plumber.

The second factor is the water pressure in your system. In a closed plumbing system a standard tank water heater can stress your plumbing pipes and fixtures through the normal thermal expansion that happens when water is heated. One 50 gallon water heater for instance can be served by a 2 gallon expansion tank. Free slots for orders with water heaters boilers and other bulky items only available in select areas of.

Monday thursday 8am 7 45pm et friday. 1 or 2. How much does a water heater permit cost. Expansion tank size calculator.