Property Ladder - kitchen supplier

[StealthUK]

Magnet mark up all their stuff at ridiculous prices in the first place. Even after their discounts I've found the same stuff much cheaper elsewhere.

[Pete C]

With a typical GSHP it would be 3:1 or 5:1 for a very good one.

What makes it worthwhile for a building with a lot of thermal mass is that you can heat overnight on economy 7 and the building will keep warm in the day.

Also the thick walls will average out the outside temp to around 5°C for NI winters, averaging out the heat load which helps heat pump capacity and efficiency.

AFAICS the economy 7 rate in NI is 3.44p and the gas rate is 2.1p, so with a 4:1 heat pump running overnight it comes out at 3.44/5 = 0.688,

3x cheaper than gas.

Electricity will lag behind a bit, so the saving will increase slightly as gas prices rise.

True, if they dry line the walls that would make a big difference as heat is released through the floor so can only escape through the walls, windows and roof.

cheers, Pete.

[IMM]

It was a church that burned down in 1904. The empty shell was there for 100 years. It was of no merit in looks. I would have ripped it down and used the stones for cladding on a new house.

[IMM]

10,00 euros. So, 10,000 divided by 6 divided by 52 = 32 per week. That is 416 per quarter. Not cheap at all. It didn't say how they calculated the payback. So after 6 years it will still cost a fortune to that uninsulated structure., I saw no insulation in the roof. None whatsoever in the wall. A total waste of time. and this sort of conversion gobbling energy should be discouraged.

[IMM]

What? The best of them x 4. So 1 kW to get 4kW of heat. Some may be x 5 as heat pumps are getting more efficient.

In the UK it is about the same as natural gas. The church was in Ireland and fuel prices may be different. An Irish guys to give us a clue?

[IMM]

There was ample land around that church to have installed a freestanding solar array. This could generate low grade hot water stored in a large thermal store. This would then heat the UFH of the church. That would not have been more expensive than the heat pump.

[IMM]

That makes sense only if you have heavy insulation on the cold side of the mass.

It was in the republic.

That's if you can store all that heat in the mass and hope it last all day and evening. Superinsulation is essential.

Forget the silly church. Using a heat pump overnight to heat thermal mass. The house would need to be superinsulated. The heat pump would need to heat large sections of thermal mass. In short, the ceilings and walls over night, not heating the air. The floor during the day if the temperature drops. Depending on the size of the house, the superinsulation would eman that only a small heating system, if at all, need be installed.

[Ian Stirling]

Agree totally, if planning permission could be obtained for it. Personally, I'd not go for a large thermal store, but an effin huge one, if possible.

At the very least a weeks worth of heating, with the collectors double or triple the nominal heat requirement.

And as a bonus, you've got a 'free' olympic sized pool. (well, maybe not quite that much)

[IMM]

You size it accordingly. You may be on about an inter-seasonal store.

A very large array of cheap collectors can deliver a lot of low grade heat, which is what UFH operates on. The odd high efficient collector for DHW may be handy.