Advice for ground source heat pump in new build with PV and batteries
Even though GSHPs are more expensive upfront, they generally offer a longer lifespan than ASHPs and significantly better SCOPs when well designed.
@barry-sharp, for example, has a system in Scotland achieving a SCOP of over 4.5, and if your budget allows, it’s definitely worth considering ground source seriously.
Yes, heating oil is currently around 50p per litre, but as we head into late autumn and winter, it’s likely to climb back toward 70p or more. In that context, a well-designed GSHP will almost certainly be far cheaper to run in the long term.
Buy Bodge Buster – Homeowner Air Source Heat Pump Installation Guide: https://amzn.to/3NVndlU
From Zero to Heat Pump Hero: https://amzn.to/4bWkPFb
Subscribe and follow our Homeowners’ Q&A heat pump podcast
Posted by: @gcon45open fire in this room to a sealed stove.
When looking at room sealed stoves, you need to ensure primary and secondary air are taken from outside - some only take primary air from outside and secondary from the room.
Room sealed should only need a 100mm hole through the wall and this is then ducted to stove.
Posted by: @gcon45I can try and find any bits of info that anyone thinks would be beneficial though?
The useful bit is the bit that specifies the heat loss at the design temp ( presumably around -3).
It's your choice of course but I genuinely fear that whoever is designing your heating system may be specifying something that you will not be happy with.
I have no axe to grind, I'm not involved with the industry I'm just an interested amateur with a background in phisics who happens to have evaluated carefully what's been said here for the last two years and, as a result, has ended up with a very satisfactory ashp experience mosty by avoiding installers that frankly were talking BS and being very careful about system sizing.
4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.
Posted by: @gcon45Yeah the flue for the fire will be sealed up for about 360 days of the year with a draught excluder.
It’s a traditional house so it’s in keeping with the style.
I’d imagine the fire will only ever be actually lit around Christmas time.
We have a cassette style inset stove, much more efficient than an open fire, which is less than 5kW so doesn’t require any deliberate ventilation. It is a Stovax but the model isn’t important. With the door closed there was no discernible air leakage when we had the whole house leakage measured.
Our MVHR endures ample ventilation if we were nervous about CO with the fire lit. The fire really is just a visitors on special occasions usage and when we feel like it, since the novelty wore off a while ago back.
So your multi-fuel stove will have no leakage to speak of leaving only the open fireplace extra to a well insulated modern house. Our 200m2 50s house needs a 7kW heat pump which keeps us nicely warm. You are unlikely to to need much above 12kW!
2kW + Growatt & 4kW +Sunnyboy PV on south-facing roof Solar thermal. 9.5kWh Givenergy battery with AC3. MVHR. Vaillant 7kW ASHP (very pleased with it) open system operating on WC
@johnmo no external air supply, just the room air. We do have CO detectors and never had any alarms.
But the measured flow on the MVHR system vent provides enough air flow
2kW + Growatt & 4kW +Sunnyboy PV on south-facing roof Solar thermal. 9.5kWh Givenergy battery with AC3. MVHR. Vaillant 7kW ASHP (very pleased with it) open system operating on WC
Posted by: @judith@johnmo no external air supply, just the room air. We do have CO detectors and never had any alarms.
But the measured flow on the MVHR system vent provides enough air flow
Braver person than me. No way I would go down that route.
- 22 Forums
- 2,074 Topics
- 45.5 K Posts
- 85 Online
- 3,350 Members
Join Us!
Trusted Installers
Struggling to find a reliable heat pump installer? A poor installation can lead to inefficiencies and high running costs. We now connect homeowners with top-rated installers who deliver quality work and excellent service.
✅ Verified, trusted & experienced installers
✅ Nationwide coverage expanding
✅ Special offers available
Latest Posts
-
RE: 5 Star Service from Havenwise
@sheriff-fatman Good post. I am also considering Hav...
By Morgan , 37 minutes ago
-
RE: Getting the best out of a heat pump - is Homely a possible answer?
@editor Cobbler’s Mantra that!
By Toodles , 1 hour ago
-
RE: What’s the modern take on advised types of insulation?
Grant was my local MP before he lost his seat. He was ...
By Jeff , 16 hours ago
-
RE: Radiators downstairs are cooler at the bottom after ASHP install
@melonbuffet This is great assuming now the down stairs...
By ASHP-BOBBA , 20 hours ago
-
RE: Commencing on an ASHP Installation Process
@jamespa Thanks for your input into this thread so far....
By Sheriff Fatman , 20 hours ago
-
Pacific Blue reveals ageing Codrington Wind Farm decommissioning plans.
Australia Blue, the first wind farm in Western Victoria...
By Morgan , 20 hours ago
-
RE: Ripped Off: How UK Homeowners Are Paying Gas Prices for Wind Energy
The challenge is who pays, who holds the debt and the i...
By Jeff , 1 day ago
-
RE: Flow rate discrepancy between ASHP and manifold
That's useful thanks, I hadn't seen that table before. ...
By AshRolls , 2 days ago
-
In principle I agree, @johnmo, but with provisos. The...
By Majordennisbloodnok , 2 days ago
-
RE: Heat pump installation and BUS Grant timings
@jamespa Thats how I understood it too. 🙂
By ASHP-BOBBA , 2 days ago
-
RE: Antifreeze top up for my heat pump - is this a rip off?
@sallyl That sounds about right if they are re-filling ...
By Brendon Uys , 2 days ago
-
RE: Enabling WiFi: Samsung ASHP on Smart Things App
I would switch it off and see if anyone noticed. We use...
By Anonymous 5011 , 3 days ago
-
I wouldn't be so sure about that. Heat pump designers ...
By JamesPa , 3 days ago
-
RE: Jokes and fun posts about heat pumps and renewables
@toodles they're a rowdy bunch!
By Mars , 3 days ago
-
RE: Home energy storage & battery register
@jamespa To a certain extent, by exporting to the grid ...
By Toodles , 4 days ago
-
RE: Forum updates, announcements & issues
@editor Fairy Nuff Mars, I doubt that my ramblings woul...
By Toodles , 5 days ago
-
RE: Confusion about heat pump sizing
We’ve published a deep dive into heat pump sizing, and ...
By Mars , 5 days ago
-
We’ve published a deep dive into heat pump sizing, and ...
By Mars , 5 days ago
-
RE: Kensa GSHP finally installed - now to start the optimisation process
Just had a quick scan of the manual and should be weath...
By Anonymous 5011 , 6 days ago