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Considering ASHP in old property
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I have had so much conflicting advice, it's not giving me any confidence. With older property, insulation is often limited, but its equal whatever your heat source. If you only have electricity as fuel, its going to cost money, either in fuel or capital investment. I'm doing an appartment, one "expert" says insulate floors, another says use the heat from below. The bulk of the UK housing stock is older, but even for new builds, its rare to find ASHP's - capital cost. Storage heaters are still mainly used where there is no gas - they dont give you heat when you need it, electric boilers are even more costly to run.
paceinternet is right - find a combination that works at a reasonable price.0 -
paceinternet wrote: »It shows a COP of up to 4.1 at:
*Outdoor temperature 25℃, Inlet water temperature 30℃, Outlet water temperature 50℃
(tell me why they quote 50 when the big selling point for CO2 is that they can achieve 65+. Yes you are right. The numbers look better at 50 than 65. Outdoor 25, thats a very good summers day here in the UK)
That is one of many 'unknowns' in the Sanyo documantation.
On a warm summer's day in UK with the inlet water at 30C and only raising it by 20C? What would the COP be on a average UK winters day of 6C or so to raise water to 65C?
What about the affect of de-icing cycles at lower outside temperatures?
Surely if a system gives you an average annual COP of around 3.0 it is excellent, but like so much advertising 'blurb' this website does try to imply the ASHP equivalent of a car getting 40mpg at 140mph;)0 -
I have had so much conflicting advice, it's not giving me any confidence.
There is no question that ASHP is by a long way the best method of heating with electricity.
The point some of us have been trying to point out is that the manufacturer's claims have to be viewed very carefully.
The principle 'lesson' is that ASHPs are at their most efficient producing 'low' temperature water. This is why they are ideally suited to underfloor heating.0
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