Forums

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

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 8 months ago
3 Posts
3 Users
0 Reactions
755 Views
RSS
 AdamK
(@adamk)
Reputable Member Member
Joined: 8 months ago
Posts: 166
Topic starter 17/03/2025 10:02 am  

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?


This topic was modified 8 months ago by Mars

   
Quote
 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 3252
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)
Noble Member Member
Joined: 2 years ago
Posts: 424
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 it) open system operating on WC


   
ReplyQuote



Forum Jump:
  Previous Topic
Next Topic  



Share:

Join Us!

Podcast Picks

Latest Posts

Click to access the login or register cheese
x Powerful Protection for WordPress, from Shield Security
This Site Is Protected By
ShieldPRO →