>> You really expect 1700 quid solar payback in two years? I really doubt that.
ok ok - maybe a bit exagerating I know. ;-)
Mind you as a rough calculation :
I don't know what gas costs per KWh as I can never make sense of the bills I get. But say it were electric at around 10p/KWh. On a sunny day that means 5KW of solar is around 50p / hour - say 4 hrs gives approx £2/day for say maybe half the year - that's about £500 per year. So more like 3-4 years. Still not too shabby.
>> You dont need pressurised hot water gravity is fine and where you need pressure -
>> in the showers - have a 1.5 bar pumped circuit.
Well that is an option and a good one in many situations. You can either have pumped shower circuits or whole-house circuits. In the case of a shower pump you also have to have a separate shower circuit.
The other thing is that many modern fancy taps only work well with pressurised water. We had some nice Hansgrohe taps in an upstairs bathroom and one would have to wait for ages to get hot water out of them. Usually I gave up waiting. (Ok I know you can have live hot water circuits to solve this too). But then it also delivered only a dribble on hot while cold (on mains) was a jet - even with all the adjusting flow regulators removed on the hot side. Now the tap works in a nice balanced fashion and I am still not used to having hot water coming out of it. The thought of a whole-house pressure pump just didn't appeal.
The only thing is that we also had to renew the cold water main to the house as this had to go from 15mm to 25mm. Lots of digging for someone...
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