On Sat, 12 Mar 2011 00:40:43 -0800, harry wrote:

Heat pumps and electricity are the way to. Zero maintenance and little
to go wrong. Run off PV panels on the roof if you like. Don't be a
lemming, be ahead of the proles.

Oh dear. So, having dug up your garden or drilled boreholes for ground
source so you can use your heat pump in the cold bits of the winter, and
having ripped out all your radiators and installed UFH or fanned rads to
work with low flow temperatures to get a COP of circa 4 for a well-
designed and correctly installed system, and having insulated your house
to the gunwhales so you can manage with about 10kW heat input when it's
below freezing outside, you're going to get the c. 2kW electrical power
the heat pump requires to operate from your PV on the roof? On a grey
winters day? Or night?

--
John Stumbles

Eagles may soar, but weasels don't get sucked into jet engines.