Ground source - new extension

[Adman101]

Ok, so i thought ground source was gonna be the way to go. But i am doubting that now after reading some posts on here.
I am planning to extend our house - part single storey part two storey on the rear elevation. I want to install underfloor heating downstairs and keep rads upstairs. We are currently on oil with no gas in the village. The house is 1830s ish and is solid stone walls about 400mm thick on two elevations and cavity walls on the other elevations. I have the space for ground loops but i am worried the house will not get up to temperature in the winter. Looking for some advice on whether ground source is the right way to go? Oil is costing me £1K a year and it is only going one way.

I would think a ground source system and underfloor heating would cost me around £17k to install but with a grant for £2.5k available and ongoing renewable energy payments, plus the saving on my oil bill i thought this would be the most viable option. A conventional oil boiler and new underfloor heating is gonna cost around £12k so it would pay for itself within 3 years.

What are peoples thoughts?

 

[Agile]

UFH is very cheap to install when a new floor is being constructed!

A heat pump is very expensive to buy and install and the operating costs are probably going to be little different to oil.

You can do the calculations based on a COP of about 2.5

If you had much UFH then that's good to heat with a heat pump. Radiators are questionable in my view as when its -1 C outside a heat pump is usually struggling and particularly after the second week and most find it difficult to heat rads to above 60 C.

Of course those who sell it will tell you its fine.

I listen to those who use it!

Another think that I find annoying is the very short guaranty given on heat pumps. I have seen a faulty ( but new ) one being sold by a supplier on Ebay. Obviously to me there is no proper repair facility available.

Now for those that sell them!

Tony

 

[ianmcd]

Tony is correct and some will tell you to go with air source but Im afraid that in my humble opinion that both are the emperors new clothes and both do actually offer some savings but neither have convinced me that they are worth investing in