I have a check valve on the output line of my water heater. Hot is hot, cold is cold, never the twain to meet.
I have a 5 gallon water heater, very inexpensive. It was the source of stinky water. I just replaced it. Pretty easy and cheap. just for fun I cut the old one apart. It was about one third full of a stinky calcium looking grainy residue. No way flushing would have gotten it out.
I have thought of having an engine heat loop in the system but those tanks are expensive. I like the "throw away" 110 volt kind.
pete
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