Renewable Heating Hub Heat Pump Forums

Search with Wattson
Forums
Renewable Heating
Thermostats, Volumi...
What is the best ap...
 
Notifications
Clear all

Joining the Renewable Heating Hub forums is completely free and only takes a minute. By registering you’ll be able to ask questions, join discussions, follow topics you’re interested in, bookmark useful threads and receive notifications when someone replies. Non-registered members also do not have access to our AI features. When choosing your username, please note that it cannot be changed later, so we recommend avoiding brand or product names. Before registering, please take a moment to read the Forum Rules & Terms of Use so we can keep the community helpful, respectful and informative for everyone. Thanks for joining!

What is the best approach for primaries in heat pump installations?

 
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Last Post by Judith 2 years ago
3 Posts
3 Users
0 Reactions
1,902 Views
RSS
 AdamK
(@adamk)
Reputable Member Member
Joined: 2 years ago
Posts: 229
Topic starter 17/03/2025 10:02 am   [#2202]

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?



   
Quote
JamesPa
 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 4 years ago
Posts: 5646
17/03/2025 4:54 pm  

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.


   
ReplyQuote
 Judith
(@judith)
Prominent Member Member
Joined: 3 years ago
Posts: 555
18/03/2025 8:49 pm  

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 SCOP >4) open system operating on WC


   
ReplyQuote
Forum Jump:
  Previous Topic
Next Topic  
Share:

SPONSORS

Join Us!

Installer Finder

Degrees of Separation

Latest Posts

SPONSORS

Click to access the login or register cheese
Protected By
Shield Security PRO