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Tiling on Underfloor Heating
is wet underfloor heating expensive to run?
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[QUOTE="Ajax123, post: 842907, member: 12267"] wet underfloor heating works on the principal of radiant heat rather than convected heat. for this reason it is more efficient than traditioanl radiators. it is however important to take consideration of a number of factors. 1. heat loss to the outside. the more insulation you have underfoot the better. typically a U value of less than 0.21 will offer a good level. the lower the u value the better. also the fewer drafts there are the better. 2. the heat transfer medium. the more responsive the better and the lower the required flow temperature the better. i other words low temperature and fast response is good. you need to use as little energy as possible to create thermal inertia. once you have the inertia it needs to stop reasonably easily if you get too hot. the best materials in the market are the anhydrites. i would say that eh... but there a plenty of independent studies to confirm. these are followed by the self compacting concretes which have a lower conductivity and larger mass so its more difficult to create inertia and response. the diffuser plates and low mass systems are the least efficient. 3. controls. think about zoning and mixing valves as well as the heat source. an air or ground source heat pump will be more efficient than a gas boiler but the gas boiler will be more efficient than oil for example. 4. pipe sizing and spacing. the less wate you have to heat the better so this is direcrly related to the above. 5. floor coverings. every time you add a layer to e floor you reduce its efficiency. the more intimate the covering the more efficient so the most efficient would be a polished anhydrite screed. a tiled floor is probably next and carpes and wood floors are the least efficient there is no reason why, if designed correctly and installed properly, a wet underfloor heating system should give you a saving. i can give figures specific to anhydrite. the flow temperatures can be reduced by up to 20 degrees C and for every 1 degree you should save around £10 a year on your gas bill (defra figures) if you have a choice go wet heating in high response anhydrite screed. e.g. [URL]http://gypsol.co.uk/media/1256/18-gypsol-htc-sheet.pdf[/URL] [/QUOTE]
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Tiling on Underfloor Heating
is wet underfloor heating expensive to run?
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