PINE GROVE, PA. — On the pressurized side of the heat exchanger, insulated pipes drop into a covered manhole in the floor of the mechanical room. From here, water heads to the buildings. There are three Rehau radiant manifolds throughout the shop, and seven radiant manifolds located in the office building across the parking lot about 300-ft. away.  To deliver the water safely and economically, flexible, pre-insulated tubing was buried below the frost line. The blue, corrugated ...

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