Spinny Posted March 5 Share Posted March 5 UFH in 120mm concrete slab. Two pipe runs in one room/one zone. How accurate are mixing valve dials - are the temp markings on the dial arbitrary or do they accurately reflect the actual temp of the mixed water ? And what flow rate would people recommend and how would you optimise it ? (presumably if flow rate is too low the heat dissipates in the first half of the pipe leaving the far end cooler?) Link to comment Share on other sites More sharing options...
Spinny Posted March 5 Author Share Posted March 5 Reckon one pipe is about 95m, the other about 60m. Link to comment Share on other sites More sharing options...
JohnMo Posted March 5 Share Posted March 5 4 hours ago, Spinny said: How accurate are mixing valve dials Generally ok, but could be rubbish, depends on make really. Ivar good and very adjustable, ESBE electronic good, most other not so good. Set the flow initially to match the pipe length and adjust up and down there. Plenty of calculators online. Thick slab is best heated by batch heating to a very low (0.1) hysterisis thermostat, or running continuously, all on a single zone. Link to comment Share on other sites More sharing options...
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