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HeatGeek vs Octopus surveys: puzzling disparity - any ideas why?

 
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Air Source Heat Pumps (ASHPs)
Last Post by cathodeRay 47 minutes ago
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 baroquebank
(@baroquebank)
New Member Member
Joined: 3 days ago
Posts: 4
Topic starter 29/07/2026 7:35 pm  

All, thank you for your constructive and helpful comments.
One thing I need to correct is the thought that Heat Geek are looking to downgrade 2 radiators. I don't believe this is the case - they are saying to upgrade at least 2 bedrooms from single to double panel units, my added puzzlement being that the existing units are already above the heat loss for the rooms. Octopus suggest nothing upstairs but propose downstairs upgrades, which difference is the basis of my query here.
FYI I have put the respective Octopus and Heat Geek measurements and suggested changes into a spreadsheet and attach a screen shot so you can see the figures.
The Heat Geek figures do refer to 2 calculations, because their initial one overstated the output of the kitchen designer radiator. On recalculating with the corrected, lower, figure for the kitchen their outcome changed to a requirement to upgrade 2 rather than 1 bedroom radiators (2nd and 3rd bedroom upgrades were originally optional).
PS: just noted an error in the chart - kitchen radiator is 1800x445, not 188x445

Octopus v Heat Geek calculations and changes

This post was modified 56 minutes ago 2 times by baroquebank
This post was modified 52 minutes ago by baroquebank

   
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cathodeRay
 cathodeRay
(@cathoderay)
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Joined: 4 years ago
Posts: 2966
29/07/2026 7:49 pm  

Posted by: @baroquebank
↑

One thing I need to correct is the thought that Heat Geek are looking to downgrade 2 radiators. I don't believe this is the case - they are saying to upgrade 2 bedrooms from single to double panel units, my added puzzlement being that the existing units are already above the heat loss for the rooms.

Mea culpa, I was the one that started the downgrade myth, in my post at 8:47am yesterday, apologies for that.

The side by side comparison is useful, one thing I have noticed straight away is the design outside air temps are different, -2.5 vs -3.3°C and that will make a difference. I will look in more detail at the rest of the numbers, probably sometime tomorrow morning, and post back, unless someone else gets there first!  


Midea 14kW (for now...) ASHP heating both building and DHW


   
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Topic Tags:  heat geek (6) , Octopus (10) , survey (3) ,

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