Heat Pumps: anyone have one/thought about it?

jonneymendoza said:
So with that. You don't need a hot water tank? People with combi boilers can just do a swap?
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That is the hot water tank effectively. You can even use it with a gas boiler to improve efficiency, though I'm not sure it would be that financially worthwhile.

It's more like an energy buffer to create hot water on demand. Once the temp drops inside, the heat pump kicks in and keeps the water heated perpetually.
 
200sols said:
Sounds like a small thermal store to me. The small size being the limiting factor which they are selling as a plus point.
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I would say it's more a thermal buffer and heat exchanger system.

The small size in testing means effectively it never ran out of hot water, as shutting the water off meant it regained temperature very quickly for successive showers.
 
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Grim5 said:
Doing my whole house with heatpumps, central ventilation and dehumidification, estimate cost at this point is 15k
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I think I'd have to make 160 years old to make that cost back with the projected savings.

Hopefully this combi style heatpump becomes popular and I can change when my boiler packs up.
 
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I was going to make a post about this when i saw the videos but didn’t get round to it.

It’s a great development for those who don’t have a large space to put a full water cylinder.

I don’t think it’s ground breaking, but clearly they have taken first principles approach to what you can achieve with a modern heat pump and it’s great to see.

Whether it’s a thermal store or not, who cares? All that matters is that it can supply a reasonable amount of hot water to supply a normal sized family home.

Frankly it’s just great work.


robj20 said:
I think I'd have to make 160 years old to make that cost back with the projected savings.
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That sounds like a higher end install, the additions are not required to do a heat pump. A more typical ‘minimum viable install’ will be a fraction of that after the grant.
 
Nutty667 said:
This is going to be a game-changer for people who don't have an airing cupboard, or they have one but it's too small, like what I was told from Octopus.

They have basically inverted the cylinder. The hot water from the heat pump (or boiler) flows into the main body, not the coils.
And hot water on demand flows through the coils and is heated as used, just like a combi-boiler. No expansion vessel is needed, no legionnaires cycle needed as there is minimal water stored, and it's always flushed through the coils.
It will fit inside a standard kitchen cupboard under the worktop. There are a range of sizes available if you have a bit more space.
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My situation too. 100L tank to be replaced with 150L but they require 1.8m height and I only have 1.5m. Heat Geek Mini Store would be perfect and simpler to plumb.

I suggested simply installing it where the existing 2 water storage tanks are for the central heating. Would need another few hundred quid for a structural survey on top of the planning permission for sound and location of the heat pump.

Those regs really need to change so I don't end up with the HP at the end of the garden facing towards the house and neighbours!
 
my potential install hit a few road blocks.

I had to have a survey done testing artex to see if it had asbestos. Luckily that came back clear.

Today the engineering team came to do a visit.

They went around making final decisions on radiator sizes and placement.

Decided where the heat pump would go and that they will board my loft out and put the water cylinder up there.

Things were going so well and he said it was going to be a easier Install than most.


Then they started doing a load test on the electricity which was fine until they discovered my supply is on a loop.

So now I have to wait for the DNO to unloop the house. Potentially having to dig up mine or my neighbours gardens.

Spoke to my neighbour about it after and luckily he was pretty chilled about it.
 
The DNO should sort it but it will take a few weeks. They may come back and clear you to install anyway.

A heat pump isn’t a significant load unless you need a really big one.
 
Anyone put their ASHP in to cooling mode? Tempted to run some cool water through the floor to bring down temps at home, but appreciate that going too cool can cause pipes to condensate where they're not appropriately insulated.
 
PermaChanged said:
Anyone put their ASHP in to cooling mode? Tempted to run some cool water through the floor to bring down temps at home, but appreciate that going too cool can cause pipes to condensate where they're not appropriately insulated.
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It doesn't work very well in cooling mode unlike A2A heatpumps. I couldn't in anycase as a condition of the payment scheme.(heat only). Once the payments stop it would just be a wire connection to be changed.
 
PermaChanged said:
Anyone put their ASHP in to cooling mode? Tempted to run some cool water through the floor to bring down temps at home, but appreciate that going too cool can cause pipes to condensate where they're not appropriately insulated.
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I wouldn’t, all my radiator pipes run through an un-insulated suspended floor, that’s a recipe for disaster if they condensate.

tonys said:
It doesn't work very well in cooling mode unlike A2A heatpumps. I couldn't in anycase as a condition of the payment scheme.(heat only). Once the payments stop it would just be a wire connection to be changed.
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Are you on the RHI?

All is new installs for the grant and don’t have such a condition. That said, I don’t know if my heat pump has the capability
 
b0rn2sk8 said:
I wouldn’t, all my radiator pipes run through an un-insulated suspended floor, that’s a recipe for disaster if they condensate.


Are you on the RHI?

All is new installs for the grant and don’t have such a condition. That said, I don’t know if my heat pump has the capability
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Yes, RHI until next August. Our pipes run under floorboards so not an option.
 
Going through the quoting process at the moment.

Started with octopus, who quoted £800 including 3 slightly larger radiators and 12m of buried pipe to house - but the ugly daiken pump and a very ugly piping job…

Have had a lot of quotes around the 5k mark - which is honestly extortion. Pricing up all the kit, and 3 days of 2 guys at £400 day rate each and it comes out at 2k if I’m being generous. I’m getting a heartloss calc’ done by a heat geek verified guy who is quoting at 3k. Will see how this progresses.
 
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found my self going in circles a bit, the DNO said before they come I need to have the energy supplier upgrade their tails and metre. They also said I need to have a electrician make my consumer unit ready. The company installing the hear pump said no they will sort the consumer unit once it has been de looped etc. The energy supplier came out and he pulled the old metre out, started installing a new smart metre but when he come to feed the new tails in he realised he couldnt get them into the old cut out. So he had to reinstall the old metre and said the DNO need to replace that first.

Have the DNO coming out next week to have a look so will have to see what they say then.
:cry:
 
As a bit of a surprise, I'm getting one fitted next week. Nibe F2050, slimline cylinder going into the loft.

I got a decent heat loss survey done a couple of months ago and there was nothing for a while, then a final survey to confirm locations and routings last week, then checked in on Monday and everything is coming next week and they're starting next Monday.

What is a bit of an unfortunate surprise is the delay with HES grant and loan payment meaning I have to temporarily cover things like the heat pump itself myself then claim back rather than being able to wait for the money to arrive. There also seems to be no consistency between installers on their payment terms. Some people want 30 days, others 7 days and immediately start charging interest on the 8th day.
 
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shroomz said:
As a bit of a surprise, I'm getting one fitted next week. Nibe F2050, slimline cylinder going into the loft.

I got a decent heat loss survey done a couple of months ago and there was nothing for a while, then a final survey to confirm locations and routings last week, then checked in on Monday and everything is coming next week and they're starting next Monday.

What is a bit of an unfortunate surprise is the delay with HES grant and loan payment meaning I have to temporarily cover things like the heat pump itself myself then claim back rather than being able to wait for the money to arrive. There also seems to be no consistency between installers on their payment terms. Some people want 30 days, others 7 days and immediately start charging interest on the 8th day.
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Is your loft insulated on the roof? I would assume if you have a cold loft, it's not the best place to put a hot water cylinder?
 
You just have to make sure every mm of pipe is properly lagged other than that they are all good. You can buy another jacket for them if you are particularly concerned.
 
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