Thread: Hot water floor heating

As the picture showing (marked by the green arrows), can anyone give an explanation why some area are warmer and others are not. Thanks.

1. Distance from supply
2. Boiler just starting up, water entering the loops will take some time to heat the mass, more so if the tubing is in concrete.
3. Insulation/radiant barrier improperly installed in concrete.

Was the heating system running when you inspected or did you activate the system?

It's only a degree or two different. I would not even worry about it. Like Ray noted, it could be caused many reasons.

If the tubing is fed from a common manifold at the end then the flow rate in each tube will vary. Slab temperature can also vary from sunlight or distance from exterior, etc.

Originally Posted by Raymond Wand

1. Distance from supply
2. Boiler just starting up, water entering the loops will take some time to heat the mass, more so if the tubing is in concrete.
3. Insulation/radiant barrier improperly installed in concrete.

Was the heating system running when you inspected or did you activate the system?

Good points. Thanks.
Yes, it is only 1 or 2 degrees difference, I won't make it a big deal. In the report, I stated " heating source is confirmed". But some clients are asking, we better give them a proper explanation.

Originally Posted by Gordon Lee

Good points. Thanks.
Yes, it is only 1 or 2 degrees difference, ...

That's 1 or 2 degrees difference in Celsius ... surely that is hotter than 22 degrees F.

I would guess that the warmer and cooler rectangles correspond to something on the underside of the floor.
Perhaps a closet for the warmer area?

Originally Posted by Jerry Peck

That's 1 or 2 degrees difference in Celsius ... surely that is hotter than 22 degrees F.

FYy'allsI, Canada, including Upper Canada, adopted Metric and joined the rest of the world about 1968, under Pierre Trudeau.