In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Radiant Heat Return Lines are Cold but floor is hot
I have a 2-story dual climate controlled system (upstairs, downstairs) with a gas furnace and radiant heat. Even with the thermostat off downstairs the floor is still warm all of the time. I initially thought it was just a bad thermostat but when I go to the furnace and feel the return lines and manifold they are cold to the touch except for one of the 6 1/2" lines but the manifold is cool above it. The pump motor is not running.
The output from the furnace goes to a Tee (one line going upstairs, one going down). I turned on the upstairs thermostat and both sections of the tee get hot, the one going upstairs and hte one going into the slab downstairs but again, the return lines from the floor are cold.
The system was installed last year and last winter it was butt-ass cold downstairs unless I had the thermostat on. If I turned it down or shut it off the floors remained cool. Since the return lines coming out of the floor in the basement are cold I can only assume that somehow the hot water is not only entering through the input line into the slab but somehow circulating but not returning to the return lines/manifold/pump.
How can it get warm and ciruculate if the water is not coming back through the return lines and pump? Could there be a leak and hot wate is spilling out somewhere under the slab? If there is a leak, does the system re-fill itself?