Indirect Water Heater Backflow Preventer

Make sure that the pipes don t go upwards in an incline before they reach your preventer.

Indirect water heater backflow preventer. Since early on the pressure release valve on the water heater has been leaking when heating 125psi 210f valve replaced to test. Think of it as a one way gate that allows water from the city s public water supply to flow into your home s piping but stops water if and when it ever tries to flow backwards into the main water supply. Fit before the heater. Tlo ct i ve searched the forum and haven t found the answer so here goes.

Don t place the backflow preventer between a heater and an expansion tank. Now that opens up the question why the vacuum breaker. Indirect hot water heater plumbing. A backflow prevention system prevents backflow.

You should fit the backflow preventer a short distance from the heater so that it is not affected by the warmth of the heated water. The 2018 uniform plumbing code also calls out in section 603 4 5 hot water backflow preventers. Backflow preventers for hot water exceeding 110 f 43 c shall be a type designed to operate at temperatures exceeding 110 f 43 c without rendering a portion of the assembly inoperative. You need to fit the backflow preventer onto the pipes before they reach the heater.

I had a new gas boiler and indirect water heater installed a year and a half ago. The cold water supply to the indirect heater may contain a check valve pressure reducing valve or backflow preventer creating a closed system as the heated water expands it builds up pressure in the closed system and this may cause the t p temperature and pressure relief valve to weep or discharge water. First the valve then an expansion tank then a vacuum breaker. Fix it home improvement channel 1 163 233 views.

Lf909 qt 3 4 fnpt bronze reduced pressure backflow preventer 175 psi lead free with quarter turn ball valve watts. Then overpressure in the water heater could push the contaminants into the city supply lines. In the installation manual for my system they suggest piping and anti backflow valve in the domestic side of the indirect. That would mean that if there was a rupture in the hx wall and the house potable had no pressure at the time because of a broken main or repair work being done at the time that the potable water system would be safe from boiler water.

For a better idea of how backflow preventers work take a look at this diagram. A backflow preventer is required on a water service water normally flows in one direction from the public water system through the customer s cold or hot water plumbing to a cold hot water heater t p relief valve drain test lever. Water heater pressure relief valve prevent water heater explosion replace a relief valve duration.