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December 1 2021 7.36pm

Air Source heat pumps

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View CPFC1965's Profile CPFC1965 Flag Warrington 20 Oct 21 12.48am Send a Private Message to CPFC1965 Add CPFC1965 as a friend

I was quoted 15000 max for an installation and could claim back on govt grant, but no official figure set as not yet available in my area of UK. Not really an incentive.

 

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View BlueJay's Profile BlueJay Flag UK 20 Oct 21 1.08am Send a Private Message to BlueJay Add BlueJay as a friend

Originally posted by CPFC1965

I was quoted 15000 max for an installation and could claim back on govt grant, but no official figure set as not yet available in my area of UK. Not really an incentive.

Limited to 90,000 grants too (out of 20 million+ homes).

 

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View BlueJay's Profile BlueJay Flag UK 20 Oct 21 1.09am Send a Private Message to BlueJay Add BlueJay as a friend

Originally posted by Mr Palaceman

That is such an excellent post on so many levels...

I had the very same thought

 

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View dannyboy1978's Profile dannyboy1978 Flag 20 Oct 21 6.50am Send a Private Message to dannyboy1978 Add dannyboy1978 as a friend

Originally posted by cryrst

The main problem is that the temperatures aren't the same as gas boilers deliver. Typically 82*c flow (out water temp)
and 71*c ( back water temp) return water temperature to the boiler. Hence the present radiator sizes required to heat the space ( room volume). Heat pumps deliver about 65*c flow which will mean up sizing radiators by at least 50%.
Ie a single will be a double and a double will be a treble. That's if they are sized correctly of course. Later for the basic calculations.
The outdoor units are much quieter than the older ones but take up a lot of space and still need power to run. An average of 8kw at the low end. That's 32 amps and many fuse boards are at the limit now so compared to a boiler at max 5 amps there are problems with the 'load' already.
The calculations for radiator sizing which I use are.
Living and dining rooms 5 BTU per cubic foot.
Bedrooms 4 BTU per cubic foot.
Bathrooms and ensuites 3 BTU per cubic foot.
BTU = British thermal units
3412 BTU = 1 kw or 1000 Watts.
Ie a lounge 10ft long x 15ft wide x7ft tall.
10 x 15 x 7 = 1050 x 5 = 5250 BTU or thereabouts
Different calcs for different rooms but same process.
If your heating with a boiler needs to be on longer than 20 minutes to warm your drum your rads are undersized I'm afraid.
I oversized mine by 20 % so 5 minutes and my place is steaming.
Most merchants brochures have radiator sizes and outputs so check if your rads are the correct size for a boiler system.
A rough measurement and type of radiator ( K1,K2 etc) will be close enough.
Then add 50% to the correct size for a boiler system to a heat pump system and watch your wall disappear for when you get a heat pump.
That's aside of an electric element in your hot water cylinder at
12amps (3 kw) to trim your hot water to 55*c and the problems gets bigger. Sadly hmg have not done any presearch or spoken to the pros and the tree huggers don't even get it either I'm afraid.
Pm me if you have any questions ref your rads.

The first batch of people will give their thoughts of how rubbish the idea of heat source boilers are

 

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View Palace Old Geezer's Profile Palace Old Geezer Online Flag Midhurst 20 Oct 21 9.48pm Send a Private Message to Palace Old Geezer Add Palace Old Geezer as a friend

We've got underfloor heating in our gaff down here in Sussex so I don't know how that would work with a heat source pump.

To suggest that gas boilers will be obsolete in about 15 years time and replaced by heat source seems like the stuff of dreams. Cryst is either in the trade or has done his homework: either way the issues he describes are substantial. As I understand it these systems require an enormous amount of work to install at the cost of thousands of pounds.

To convert the entire population is an almost unimaginable task and expense that the government don't appear to have worked through at all. Nice idea, but surely not yet viable.

Anyway, where's all the electricity coming from to power just about everything in our lives from kettles to cars to heating?

Frankly, it's unlikely I'll still be around to see how all this pans out, but I do worry for my grandchildren.

 


Dad and I watched games standing on the muddy slope of the Holmesdale Road end. He cheered and I rattled.

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