By Sergio Ferreira / Published on Wed, 2008-05-21 17:18
Heat pumps are driven by fairly large electric motors. Such motors work best with a 3-phase electrical supply. Unfortunately, this supply is not common for most houses in Europe. Having said that, small heat pumps (say up to 8 kW output) work just as well on single phase. Multiple compressor systems are available.
A 3-phase unit will arguably last longer, or may be a little more reliable than a single phase unit, so we favour that type.
It may be worthwhile asking your electricity supplier the cost of installing a 3-phase supply.
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By Sergio Ferreira / Published on Mon, 2007-07-09 14:56
The PV system, installed on the south facing roof, consists of 24 panels of 160 W each from Shell and covers 30 m2. The cells are made of polycrystalline silicon and have a 25 year guarantee.
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