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Ideal Supply & Return Temp for Radiant Under 3 1/4\" QS Oak??

hot_rod Member Posts: 22,158
that can meet the load and heat the space.

If you have a heatload and design on the system it should provide the temperature requirements. Generally at design (coldest) day.

The Quiktrac design guide will show outputs for that system at various S&R temperatures.

So you can back into the answer or go forward in for the answer.

Is it working now and maintaining a comfortable room tempreature?

A good idea to watch the floor surface temperature. most agree below 85F is a safe number.

Be sure the boiler and the piping is correct to work at those low temperatures. If it is a cast or copper boiler it would need a mixing device and low return protection device, or control.

hot rod
Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream


  • Underfloor Fred
    Underfloor Fred Member Posts: 9
    Ideal Supply & Return Temps for Radiant Under 3/4\" QS/RS Oak?

    Hello Folks -

    Can someone please adivse on the ideal water temp at the supply manifold to service my underfloor radiant system? Flooring is 3/4" QS/RS white oak.

    5 loops (avg. 225 - 240') of 5/16" pex laid down in quicktrack over advantex subfloor with spray on foam icencne insulation beneath subfloor.

    Currently running approx 110 at supply and about 85 on the return.

    Many thanks
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