Reply To: leaking water heater inlet

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Where is the pressure reducing valve located? Does it only reduce the pressure to the hot water system or whole house?
You have answered your own question when you say that the valve still leaks when the system is turned off even when you replaced it. If there is no water going in to the water heater nothing can come out unless it is coming from somewhere else. It could be a cross-connection from a faucet. Get a pressure gauge on the hot water system and find out what the pressure actually is!! I would suggest the valve is only doing its intended job which is to releive a buildup in pressure (over 850 kPa).

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