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Old 01-02-2010, 11:39 PM   #1
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In Floor Heat Flow Adjustment


Hello,

Is there a correct way adjust the water flow in my in floor heat system for best efficiency? I have 2 loops (about 200' each, pex tubing) connected to one pump. There is a manifold where the tubes return with 2 valves on it that control water speed?

Always wondered what the most efficient "flow" is. Let the water flow quickly or slowly?

This is heated by a electric on demand boiler and the temp maxes out at about 110 F

Also what pressure should I be running in the system? Right now it's at 40 psi

Thanks,
Dustin
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Old 01-03-2010, 07:56 AM   #2
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In Floor Heat Flow Adjustment


GPM requirement is determined by the heat load of the loop/zone.
Need to know that, with entering water temp(which you said is 110) then determine proper temp delta of the returning water.

This should have been done during the design process.

Little to no reason to run 40PSIG in the loops. Unless they are 80 foot or so above your boiler.
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Old 01-03-2010, 02:11 PM   #3
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In Floor Heat Flow Adjustment


Quote:
Originally Posted by beenthere View Post
GPM requirement is determined by the heat load of the loop/zone.
Need to know that, with entering water temp(which you said is 110) then determine proper temp delta of the returning water.

This should have been done during the design process.

Little to no reason to run 40PSIG in the loops. Unless they are 80 foot or so above your boiler.
Good to know on psi, the loops are only slightly elevated above the boiler, like 1 foot. I'll drop the pressure in there.

There was no design on this system. Was a 1890's house I remodeled and put concrete in for main floor. I installed the pex myself and had plumber add the boiler. The main reason was to make sure the floor doesn't get too cold in winter but it ended up being primary heat source with gas forced air furnace as back up.

Not sure if you can determine anything with that info. The house is about 1500 sq ft total
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Old 01-03-2010, 02:55 PM   #4
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In Floor Heat Flow Adjustment


Yeah. Hard to tell you anything from that.

Check your loop temp difference. If its greater then 20, you can increase your flow rate.

If its less then 10, your a bit too high in flow rate.

Check your boiler to see how high of a pressure relief valve is on it.
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