Response to I have a Ray Pak 2100, it ignites and gives off an excellent flame, produces a lot of heat but it only raises the water temperature 5 degrees from 71 intake to 76 going back to the pool. I was told by Ray Pak it could be the "Unitherm Governor" which is similar to the thermostats in a small block Chevy, I removed it and it made no difference, I would be greatful for any suggestions you might have? Phil
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