Renewable Heating Hub Heat Pump Forums

Search with Wattson
Forums
Renewable Heating
Air Source Heat Pum...
How Accurate Is My ...
 
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!

How Accurate Is My DIY Heat Loss Calculation?

 
Page 3 / 3
Air Source Heat Pumps (ASHPs)
Last Post by AndrewJ 1 month ago
28 Posts
8 Users
11 Reactions
1,474 Views
RSS
 kilgorexv
(@kilgorexv)
Active Member Member
Joined: 6 months ago
Posts: 17
Topic starter 30/08/2026 8:44 pm  

@old_scientist i dont but i want to be able to reasonbly replicate what an installer will produce so i can unserstand any proposals.


This post was modified 1 month ago by kilgorexv

   
👍
2
ReplyQuote
 AndrewJ
(@andrewj)
Reputable Member Member
Joined: 2 years ago
Posts: 248
30/08/2026 8:54 pm  

@kilgorexv definitely a larger inverter will help and more PV will help support your usage in winter - we have 10kW of PV split across east and west and even on a cloudy day it would cover background load plus a bit.  DNOs have started restricting both export and inverter sizes so it’s worth upgrading those as soon as.  Our export limit is 3.68kWh but with some planning we can avoid clipping except for an hour or two on the sunniest, mid-summer days.  It all helps towards a -£7 bill last year!



   
ReplyQuote
Batpred
 Batpred
(@batpred)
Noble Member Member
Joined: 2 years ago
Posts: 1190
04/09/2026 7:18 pm  

Posted by: @andrewj
↑

It all helps towards a -£7 bill last year!

That's great! I think we managed to get to that last month (no PV) but the heatpump will easily change that as winter approaches. 

 


8kW Solis S6-EH1P8K-L-PLUS hybrid inverter; G99: 8kW export; 16kWh Seplos Fogstar battery; Ohme Home Pro EV charger; Vaillant Arotherm Pro 7kW; 100Amp head, HA lab on mini PC


   
ReplyQuote
 AndrewJ
(@andrewj)
Reputable Member Member
Joined: 2 years ago
Posts: 248
04/09/2026 8:41 pm  

@batpred I suspect it will be more this year.  I had 9 months at 15p export and just 3 months at 12p.  This year it’s likely to be 12p all the way, although it could come down again I suppose.  3p doesn’t sound like much but it all adds up!  Still,  I pared to £2100 a year, it’s a massive saving.



   
ReplyQuote
Page 3 / 3
Forum Jump:
  Previous Topic
Next Topic  
Related Topics
Topic Tags:  Heat loss (8) , ASHP (88) ,

Currently viewing this topic 2 guests.

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