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Radiant Floor Heating in Custom Homes: Two Industry experts discuss Modern Radiant Heating.
Recently there has been a great deal interest in all electric hydronic heated homes across the country, spurred by California’s commitment to all electric homes powered by renewable electricity and now being discussed and built across the country. The collapse of solar electric panel and storage costs and the rise of superefficient heat pumps make this possible and cost effective.
The goal is to provide a building design with integrated highly efficient electric heating, hot water and cooling solution whose electric demand is low enough for a solar electric system to meet the entire load (and fit the roof).
Air-to-air forced air super-efficient mini split systems with a separate electric hot water heat pump have been available for some time now. Similar solutions are now available for hydronic systems that include hot water supply without the sound, lower efficiency and space demands of standalone heat pump water heaters, or the visual impact of wall mounted mini split terminal units.
Hydronic heat pumps provide far more efficient electric domestic hot water supply than stand-alone heat pump water heaters. (COP 4+ vs COP2), are quieter and require no makeup air. Hydronic distribution is also far more efficient than forced air.
Hydronic Heat pumps provide very efficient electric hot water heating and domestic hot water plus chilled water cooling.
Most manufacturers publish this data or it is available in this format from third-party engineers and manufacturers. The chart demonstrates the supply water temperature required to meet a given heat loss (BTU/Sq/Ft.) with a certain finished floor assembly resistance (R-Value). A low R-value of R=.05 would be tile, while a carpet with a carpet pad might be R=2.5. So for example, start at 20 BTU/Sq/Ft. on the X axis, go over to R=1 (hardwood) and go down and it will read about 105F.
ThermalBoard can heat a typical space using 90F–105F water temperature for floor systems and using wall and ceiling configurations in the 80F–95F range. Look at the heating capacity chart to see what a difference it makes for increased hydronic heat pump capacity and efficiency! Thermalboard. A perfect match!
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