Plenty of threads here here about UFH.
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Be careful about the UFH/radiator combination. In an UFH system, the water temperature in the pipes is about 30 degrees Celcius - much lower than conventional radiators. So your upstairs rads will need to be optimised for this. You can get fan-coil radiators which operate with a low temperature supply, but require a small electric fan to help distribute the heat. This complicates your wiring somewhat so your electrician will need to know about it. There are other types of radiator available too.
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this advice is wrong . you dont need to do anything to your rads . the ufh ystem would have a thermostatically controlled valve/mixer set which reduces to the temp in the ufh circuit to 25-40 by pumping the same water round and round each ufh loop , only letting small amounts of water as required from the main rad/boiler circuit (60-70 degs) to maintain the set ufh pipe temp.
Just at first floor level on a 3000 sq. ft ICF self build, would love UFH, but have been put off by running costs of same when using oil or geo-thermal heat pumps. UFH on oil seems to cost a fortune, and having researched UFH via geothermal, lots of horror stories about ESB costs and system configuration. Have ruled out Wood Pellet Burners for reasons of poor pellet supply/product quality. Anyone had experience of UFH via geo thermal, particularly interested in actual running costs of heat pumps.
I am running a 30 KW wood pellet boiler to heat just under 3000 sq foot of UFH. Its on 24 x 7 at the minute as I am trying to dry out the house before putting down floors etc. I am using bagged pellets at the minute as I am awaiting an outdoor silo which will allow me go bulk. My DHW is not connected up yet so its only the UFH thats calling the boiler for heat (Solar will take care of DHW alot of the time anyway).
I am burning less than 1 bag of pellets a day at the moment. Thats 15kg of pellets a day. Thats 3.50 euro per day at bagged prices and once I go bulk this will drop to 2.50 a day. I am well impressed. A self modulating pellet boiler works very well with UFH.
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