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Ever since I plumbed in a hot water return line I get instant hot water but the shower seems to have hot water for less time. Occasionally hot water starts to come from the kitchen sink cold side after about the same amount of time it used to take to get hot water from the hot side.
There must be some crossover somewhere. This is a no pump loop DIY system 3/4 copper to 1/2 inch return.
Is there a super low pressure check valve I can install? Is it better to run a pump?