Ideally we want to only ever heat water from 45 C through to 65 C to maintain underfloor heating. temperature of 55˚C max.
Typically, the temperature of the water in an underfloor heating system is between 35 and 55 degrees Celsius-depending on the floor construction. Efficiency Can Be Improved. The efficiency of an underfloor heating system can be improved by lowering the water temperature and increasing the amount of pipe in the floor. Underfloor heating systems with pipe at the correct spacings can operate effectively with flow temperatures as low as 35 degrees Celsius. A typical underfloor heating system might be designed to operate at a maximum underfloor temperature of 55˚C for a screeded floor and possibly higher for a suspended … Read more. Posted by: Ben Jones March 23, 2013 Underfloor Heating.  With underfloor heating one only needs a flow temperature of 55 C max. The lowest temperature in the system is the underfloor return, at between 30 and 45 C, so ideally we want to only ever heat water from 45 C through to 65 C to maintain underfloor heating (assuming 20 C rise is suitable for boiler).  ... boiler fed radiant heat under wood floors and in a new cementer kitchen floor. Under the wood floor, we often run the water at 125-130 degrees.... You should have a tempering valve installed on the output of the boiler that mixes some of the returning water with the boiler output to lower the water temperature. If the floor is required to be much over 80n F the design will not work well. The boiler temperature is rarely the actual circulating temperature, and if you boiler is only running at 115F it is not going to have a long life unless it is a high end unit with a stainless steel heat exchanger. I have boiler fed radiant heat under wood floors and in a new cementer kitchen floor. Under the wood floor, we often run the water at 125-130 degrees-- Of course, the surface of the wood is nowhere near that hot-the tubes are suspended below the flooring. If the floor is required to be much over 80n F the design will not work well. The boiler temperature is rarely the actual circulating temperature, and if you boiler is only running at 115F it is not going to have a long life unless it is a high end unit with a stainless steel heat exchanger. 1 RADIANT HEAT TEMPERATURES-CONTENTS: What is the optimal temperature for radiant heat piping. 2  Radiant heat temperature settings under tile, hardwood, carpet, laminate floor choices. Under wood floors nailed right to the subfloor and tubing below, radiant heat temperatures are typically at the middle of our 85-135 °F. temperature range, or about 105-115 °F. Yes, radiator systems will operate at a boiler flow temperature of 82°C and a temperature drop of 11°C, but an underfloor heating system will run at temperatures in the range of 35°C to 60°C depending on floor conditions and the type of building. Depending on the exact design and installation, an underfloor heating system is between 15% and 40% cheaper to run than a conventional radiator system. The temperature at ceiling level could be nudging a tropical 30C, but the floors might remain a chilly 15C. With underfloor heating, the heat is much more even. Floor thermostats are ideally set at 21C-a pleasant temperature for stockinged feet-and the air, walls and furniture will reach that temperature as well. Second, underfloor heating stops wall space being taken up by radiators.  How much does it cost to run an underfloor heating system? No matter which heat source is used, underfloor heating is the most economic heating system available. Depending on the exact design and installation, an underfloor heating system is between 15% and 40% cheaper to run than a conventional radiator system.
http://centralunderfloorheating.com/water-underfloor-heating/how-underfloor-heating-works.html http://thegreenhome.co.uk/heating-renewables/underfloor-heating/what-are-the-temperature-limits-of-underfloor-heating/ http://www.heatweb.com/techtips/Underfloor/underfloorheating.html http://ths.gardenweb.com/discussions/2458773/floor-temperature-range-for-radiant-heat http://ths.gardenweb.com/discussions/2458773/floor-temperature-range-for-radiant-heat http://inspectapedia.com/heat/Radiant_Heat_Temperatures.php http://www.u-u-h.com/frequently-asked-questions/ http://www.telegraph.co.uk/finance/property/3345024/Will-you-really-feel-the-heat-under-your-feet.html http://www.u-u-h.com/frequently-asked-questions/
what temperature should underfloor heating be