Radiant loops, pumps and more heat

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Old 12-03-08, 03:06 PM
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Radiant loops, pumps and more heat

I have a 4" slab floor in the kitchen with 8 1/2" loops and am concerned about the heat output.

I was told that a fatter tubing size will not increase the heat output so what will?

Will moving the water through the pipes faster increase the heat output?
 
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Old 12-03-08, 03:23 PM
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Heat output is affected by tube size (for better flow rates, longer lengths), flow rate, spacing, water temp and loop lengths.

If it is already in, you can't add tube or change spacing.

Most systems are designed and most efficient with a 15-20 degree temp diff between supply and return so if you are wider than that, yes increased pumping will help.

Higher water temps will help to as long as you don't exceed flooring material limitations and feet comfort level.

Other than above with high heat loss, large exposures or infiltration, it is not uncommon to require supplemental heat such as a baseboard convector or a kick-space heater. Many time people will just beef up an adjoining room if they are open between the two.
 
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Old 12-03-08, 10:12 PM
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What exactly is under the concrete?
 
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Old 12-04-08, 03:40 AM
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Under the concrete is a full basement.
 
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