hot water from the sun
The solar thermal panels mounted on the south facing elevations of the North Wing should reduce water-heating costs by £100 p.a. at current prices for gas/electricity assuming average domestic use for two people. If, as we expect, gas and electricity prices double in the next ten years, that saving is obviously doubled and the pay back period halved. There are few things that can go wrong with a solar thermal panel - it uses the sun's energy to heat a separate coil in the hot water cylinder, which in turn heats the rest of the cylinder.
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