hot water heater

MT

had a problem with a water heater in a garage on a platform that when I raised the temperature to hot setting my relief valve would blow off. Does this mean that I need a water expansion tank to take up some of the pressure?

kevin coppinger_4

probably...

is there a check valve at the water main or a pressure reducing valve? How high did you raise the temp to and why? Be careful to not scald your self...if you did it to get more hot water output I would do a mixing va;ve to assist in the process....kpc

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hr

It could be

caused by excessive pressure, use a lazy hand gauge to monitor this for a day or so.

Or it could be a high temperature relief. Most T&P valves are set for 210°F relief I doubt that the tanks aquastat allows you to run that hot.

Look for a check or backflow preventor on the incoming line. It could be at the meter if you are on city water.

In the case of excessive pressure a DHW thermal expansion tank, properly sized, will be needed.

hot rod

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