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What temp is the water heater set to?
Sounds like piping issue although a 50 gallon tank is pretty small for this type of system. Can you give me a picture of the heater and the piping around it?
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Ok, what I really need a better look at is the piping on top of the tank.
Ok, sorry but they really weren't much help. I can't tell what's under the insulation and I need one shot with all the piping around the top of the heater. Can you take the insulation off? If not the best I can do is speculate that at a minimum you have a missing check valve to keep the cold water from crossing over to the hot. I could also use a wider angle shot that shows the heat exchanger/air handler and the tank in the same frame.
It should. The tempering/mixing valve is just to cool the water off out of the tank so you don't get scalded when you turn on a hot water faucet
In case my answer wasn't clear this type of system seldom works right without a check valve. I know some piping diagrams don't show one but they are a poor design
i have 1200 square feet house and i need to replace my