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[Solved] How many people are happy with their ASHP and do you believe them?

 
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Air Source Heat Pumps (ASHPs)
Last Post by JamesPa 31 minutes ago
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Majordennisbloodnok
 Majordennisbloodnok
(@majordennisbloodnok)
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Joined: 4 years ago
Posts: 1799
25/05/2026 8:57 pm  

Posted by: @jamespa
↑

The point I was making about averages (in any region) is that the average of the half hourly, or daily, price over a year is not the same as the average price paid.  If most of the consumption is when the price is highest (which is very likely the case) then the average price paid will be closer to the highest price than the unweighted average of the daily/half hourly prices.

OK, I missed that bit and you're right, of course.

That said, we still can't escape that the prices I provided were a direct comparison of leccy and gas under the same tariff structure on the same day, and so that gives a very real ratio based on actuals rather than averages. However, as you say, the tracker tariffs are not the most common ones chosen so it makes a lot of sense to try to find some similar historical comparison data for a more common tariff. I'll see what I can find.

 


105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

"Semper in excretia; sumus solum profundum variat"


   
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JamesPa
 JamesPa
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Posts: 4909
25/05/2026 9:38 pm  

Posted by: @majordennisbloodnok
↑

I'll see what I can find.

Good luck, I spent a couple of hours and, whilst I found several leads, the 'new' ONS numbers I found (source references in the spreadsheet) were by far the ones I trusted most.  They don't say obviously what the methodology is, but I think it's likely to be consumption weighted.  However even if it isn't that matters less than with a daily varying tracker rate, because the supplier tarrifs on which the ONS data is based will vary relatively infrequently compared to the octopus ones.

I do not dispute that that the ratios from octopus tracker are real and relevant, this does illustrate that choice of tarrif matters.  I do wonder how octopus managed to depart so far, were they playing commercial games (or experiments) maybe they bought ahead the wrong amount by a large margin.


This post was modified 26 minutes ago by JamesPa
This post was modified 23 minutes ago by JamesPa

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.


   
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