On May 25, 10:02*am, The Natural Philosopher
wrote:
Martin Brown wrote:
On 25/05/2012 09:45,www.GymRatZ.co.ukwrote:
On 25/05/2012 06:42, harry wrote:

Such a device is pointless. *You don't need any house heating when the
sun is shining. Heat collected in Winter is minimal in the UK climate..

But if the cooling of the PV increases their output and can provide a
20+ (?) degree temperature rise to pre-heat mains cold water before it
goes through the combi. that could in it's self could make quite a
reduction on gas consumption during summer months for DHW would it not?

(throwing ideas in the air for discussion and dissection)

The problem is one of cost effectiveness and complexity.

There is no point in saving power usage to create vast quantities of
lukewarm water that you don't need in mid-summer if it makes the whole
installation a lot more expensive and prone to failure.

A rough rule of thumb is that summer DHW is less than 10% maybe as low
as 5% of peak winter space heating requirements. We are just too far
north for solar power to be sensible without market distorting FITs.

I calculated that my annual DHW costs are about £100 quid. My annual
heating costs are now getting on for £2000 of which about £1200 is
between November and March. Plus a couple of hundred for wood.

That's on a fully insulated house run as cold as I dare.

--
To people who know nothing, anything is possible.
To people who know too much, it is a sad fact
that they know how little is really possible -
and how hard it is to achieve it.- Hide quoted text -

- Show quoted text -

My PV array is worth £2200/year to me taking into account tax.
I have no heating bill & my electric bill is around £400.
Not very smart are you?