Luke warm water

Luke warm water

by Walt Perkins
(California)

After complaints about lukewarm water inside my neighbor's house, I started to investigate and found this. They have a Rheem on demand and I started to check for hot water by opening up the pressure relieve valve. Water is only hot if I shut off the valve on the hot side going to the house but if I allow the water to flow to the house the water gets lukewarm.

Another word the water comes from the cold side into the tank thru the PRV then thru the shut-off valve to the house.it's only hot when I restrict the flow by shutting off the valve that's after the tank and feeding the house. Any thoughts?

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