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You nailed it. It is a Grundfos 15-18 pump. There is no timer or thermostat that I can see, so it runs 24/7. The return line is very hot, goes through the pump, through a check valve (at least that's what I think it is), through a Tee (with the drain) and back into the bottow of the water...

There is a check valve right next to the pump. Also, the pump is quite hot. I don't know how you check a check valve?! Dave

I have a very wide home with the water heater on one end. I have had a hot water recirc. pump for two years and it is fantastic. A couple of months ago, I noticed that hot water was coming out of several faucets near the hot water heater (and pump). I have checked all valves in the house to...