kevin wrote:I agree with JackBob, except for one point-
Replace the electric water heaters with solar heating systems... no problem. Solar thermal systems are by far and away the best investment in terms of solar energy.
HOWEVER,
They most definitely do not last as long as PV panels. Most PV panels now are covered by a 25 year performance warranty (80% output after 25 years). A huge majority of the PV produced in the 60's and 70's are still working. I have several customers with this equipment.
The evacuated tube systems that I've installed are overkill for domestic hot water systems. A regular flat plate collector works very well, if sized and installed correctly.
Remember, comparing solar thermal systems with solar electric systems is apples and oranges. They do two different things.
Solar is still cool!
I'd be interested in knowing more about the evacuated tube systems. Our cottage currently has an oil-fired AGA (cooking plus domestic HW)plus an oil-fired central heating boiler which we rarely click on. I am wondering if the tube systems would provide enough hot water for domestic AND central-heating rads - any links that might take me further or any personal experience?
JackBob