What is the best approach for primaries in heat pump installations?
Was speaking to my builder this morning and he was saying about putting the primaries in the cavity when he rebuilds a rear wall, think hes trying to eliminate the need for trunking/insulation on the rear of the house. Im not sure about this as although there will be fibre glass insulation in the wall and themalite type block work internally im not sure it would be as good as using the zero loss insulation and trunking?
Personally I would want them inside the heated envelope if possible. Then the heat loss is useful during the heating season. Obviously its a bit situation dependent. Inside the cavity (preferably near the inner leaf) is, I guess, better than outside!
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: @adamk…….. block work internally im not sure it would be as good as using the zero loss insulation and trunking?
Don't forget there is no such thing as zero loss insulation and trunking! So inside the envelope is best everything else looses some heat to the external world rather than heat the house.
Don’t let your builder run the primary pipes in the space between the insulation and the external wall, it’s nearly as bad as running them uninsulated outside! Under the insulation in specially carved channels is not too bad
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
- 26 Forums
- 2,255 Topics
- 50.3 K Posts
- 527 Online
- 5,918 Members
Join Us!
Podcast Picks
Latest Posts
- 
                        RE: Are We Sleepwalking Into Another Race to the Bottom? The Toyota plugin hybrids are very similar to their reg... By Temperature_Gradient , 22 minutes ago 
- 
                        RE: Midea ASHP – how to set weather compensation @cathoderay comments duly noted. I don't disagree with ... By pash44pump , 2 hours ago 
- 
                        RE: Daikin Altherma 3 / HomeAssistant I don’t have a Shelly EM on my heatpump, so only see th... By DCSH , 9 hours ago 
- 
                        RE: Help me keep the faith with my air source heat pump installation have you got an ebus adapter on yours? By AdamK , 10 hours ago 
- 
                        RE: When will fusion be producing energy? From the time I was a physics undergraduate it’s been 2... By Judith , 10 hours ago 
- 
                        RE: Is it mad to think there should be a minimum SCOP for UK heat pump installs? Sadly I think it is mad. If the BUS is not granted for ... By Judith , 10 hours ago 
- 
                          RE: Who has a V2G EV installation Perfect, @agentgeorge. I’m always up for some edificati... By Majordennisbloodnok , 11 hours ago 
- 
                        RE: My experience with 3 heat pump surveys: Heat Geek, British Gas & Octopus Yes but... The evidence is that many heat loss survey... By JamesPa , 11 hours ago 
- 
                          What Adam Chapman gets up to in his Spare Time. Ok, so this just appeared on YouTube (don’t blame me th... By Toodles , 12 hours ago 
- 
                          RE: Radiator Sizing Dilemma: Vertical vs Type 33 for Low-Temperature Heat Pump Systems That's my main concern too. On top of that, I ... By DREI , 13 hours ago 
- 
                        RE: Grant 13kW Aerona3 - issues getting zones to temp Thanks, patience is something I’m trying to ma... By Crimson , 15 hours ago 
- 
                        RE: Solar Power Output – Let’s Compare Generation Figures 2025 - now a record year of Solar PV Generation. Octobe... By AllyFish , 19 hours ago 
- 
                        RE: Mitsubishi Ecodan R290 10kW performance Totally agree that any system is reliant on the ability... By Sheriff Fatman , 20 hours ago 
- 
                        British Gas Heat Pump Installation Complaint In 2024, my wife and I thought that we would try to do ... By BGNO , 22 hours ago 
- 
                          Erm... no we can't! The issue first raised by the OP ... By Transparent , 22 hours ago 
- 
                        RE: Testing new controls/monitoring for Midea Clone ASHP Thx, but Sven did the hardware development. My role (as... By Mosibi , 1 day ago 
- 
                        RE: PV Panels on roof in Conservation Area @majordennisbloodnok Fnaargh, I was thinking about try... By colinc , 1 day ago 
- 
                        RE: Electricity price predictions @jamespa Ah, you mean MPs that have not pro... By Batpred , 2 days ago 
- 
                        RE: Buying large amp bidirectional RCD and RCBO Exactly @transparent , this type of RCBOs are not easil... By Batpred , 2 days ago 


 
                                 
                                 
                                 
                                