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I have an oil fired peerless boiler with tankless coil. Just recently I have had a drop in to water temp in house. The pressure level is fine but temp is waaay to low. The coil was just replaced 1 month ago. The water is very hot coming out of the coil but cools drastically on way to and through coil. As a result ; the hot water temp is cold rather than hot. What could it be