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Second try at this post.
Thanks for all the suggestions. Here is the latest. Idid not find the cause of the problem, but investigated and experimented and here's what I have found:
Recap: When I am hooked up to city water, all faucets are hot/cold reversed, and the toilet flushed hot. When hooked up to my water tank, they are correct. The water tank is gravity fill, it has an inlet and air line on the top, a drain line on side/bottom, and an exit line. There is a shutoff valve on that exit line, then a (I believe) check valve to prevent backflow, then the water pump. There is no "manifold" or "city/tank" switch. There is a switch for the water pump.
1) I thought perhaps the fault lay in an abnormal connection within the kitchen faucet. Hence, I disconnected the hot and cold supply lines and capped them. I then tried the other faucets on both city and tank water. No change, still reversed.
2) I once again tried every possible combination of valve setting in the winterizing area in front of the back of the water heater. No change.
3) AND FINALLY I disconnected the cold supply line from the cold water side of the kitchen sink. I then, while running the water into the bucket, with the water heater on, turned on the city water. Water ran COLD. I then shut off the city water, did the same with the tank water. Turned on the pump, the water out of the blue line was HOT. There's a clue in here somewhere, but I can't figure it out yet. It does appear that (possibly) the kitchen faucet is hot/cold reversed, as city water that is cold runs out of the hot side of that faucet. However, that doesn't answer the question. Why would tank water run hot out of the cold supply line?
Thx for everybody's help. Maybe with all of out time off we can come to some sort of conclusion?
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