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Estimating true heat loss from twelve months of consumption data

 
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Air Source Heat Pumps (ASHPs)
Last Post by ian33a 26 minutes ago
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 Travellingwave
(@travellingwave)
Trusted Member Member
Joined: 3 years ago
Posts: 62
20/05/2026 5:45 am  

We have one of these, displays flow in m3/hr to 0.1 accuracy.

https://www.bes.co.uk/wilo-yonos-pico-25-1-8-130-central-heating-pump-27551/



   
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 Travellingwave
(@travellingwave)
Trusted Member Member
Joined: 3 years ago
Posts: 62
20/05/2026 5:51 am  

@ian33a 

link to heat meter

https://shop.openenergymonitor.com/axioma-qalcosonic-e4-heating-cooling-meter-m-bus-dn25-qp3-5/

and Mbus dongle

 



   
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 Travellingwave
(@travellingwave)
Trusted Member Member
Joined: 3 years ago
Posts: 62
20/05/2026 5:53 am  

https://shop.openenergymonitor.com/m-bus-to-usb-converter-heatpump-monitoring/



   
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 Travellingwave
(@travellingwave)
Trusted Member Member
Joined: 3 years ago
Posts: 62
20/05/2026 5:59 am  

I would imagine you can integrate this to home assistant - however I would recommend OEM as it will just work out of the box - and if you then subscribe to heatpumpmonitor.org there are good tools available for calculating heatloss based on real data over a heating season.

Welcome to to the sad retired engineer club by the way.



   
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 ian33a
(@ian33a)
Active Member Member
Joined: 3 years ago
Posts: 7
Topic starter 20/05/2026 6:04 am  

Thanks - that's certainly very useful.

I'll need to think carefully about these options in the context of our dual circuit UFH system with a thermal store. 

I can see another DIY project coming !



   
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 Travellingwave
(@travellingwave)
Trusted Member Member
Joined: 3 years ago
Posts: 62
20/05/2026 6:10 am  

Note this version is suitable for up to 17kw heatpump - which is practically all heatpumps you are likely to install.

Note also it is not calibrated for use with glycol in the system.



   
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 Travellingwave
(@travellingwave)
Trusted Member Member
Joined: 3 years ago
Posts: 62
20/05/2026 6:11 am  

@ian33a 

suspect thermal store and heatpump may not play nicely but not sure about that- do you have solar thermal as well?



   
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 Travellingwave
(@travellingwave)
Trusted Member Member
Joined: 3 years ago
Posts: 62
20/05/2026 6:26 am  

By the way we are very pleased with our heatpump in a 250 year old stone house. The thermal mass is massive so long low and slow works well - we just let it run 24/7 during the winter. We have mostly rads but if you have UFH even better providing you have good insulation underneath. Thermal mass is huge and you really see it when first switch on heatpump - takes 24 hours to reach steady state. I would imagine cob even more so.



   
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 ian33a
(@ian33a)
Active Member Member
Joined: 3 years ago
Posts: 7
Topic starter 20/05/2026 6:38 am  

I've heard that heat pumps and thermal stores are not ideal too. We don't have solar thermal.

The system was installed by a previous owner. I've gradually modified controls for it to improve efficiency. I'm reasonably confident that it was decently installed and, yes, thermal mass really makes a very positive difference. We run the system 24/7 in the winter too - 18 degrees during the day and a 2 degree set back at night using a flow temperature of around 45 in each circuit. In the summer I turn it off as the mass of the house keeps things nice.

The front third of our house is about 300 years old (cob), the rear third is victorian stone and the two ends are 20th century block cavity. Insulation is reasonable but I don't want to fit more and ruin the character of the house. 



   
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