Thanks guys, I have two separate sets of hoses running forward from these 4 valves. It looks as if each set has a valve on the top or front of engine and the other valve is lower. I shut off the set going through the circulation pump (on the side of engine) and will drive it soon to see what gets hot. Hopefully the bedroom heater is not on the same set as the water heater. If it is then I'll add two valves to shut this off.
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