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I have a customer with a Bradford white direct vent water. It is serving a 35x35 garage with 5 lops of radiant 1/2 tube installed. It is unknown the legnth of the tubing. When we started the system the return water temp was around 50 degrees. It seems like it is taking forever to heat the slab. After 30 hrs the slab is now about 65 degrees. The input on the heater is 38,000 btu. The circulator return is pipd to the " hot" out on the water heater and the return piping is piped to the "cold" inlet. Not sure of the heat loss in the building.....
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