You are always going to get some change in pressure while using the stock water pump. They are adjustable, but are usually set for 30 psi on and 50 psi off. The expensive fix is to install a variable speed water pump. The cheep fix is to install an accumulator in the output line from the water pump. The longer pipe run to for the hot water to the faucet is responsible for the temper change at the mixing valve. Low water pressure and the water heater restriction (piping) means less hot water and more cold water.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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