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Last seen: Oct 16, 2026
Some observations: 1. I for one don't know the Vaillant jargon and that makes it difficult to comment, or even understand what the problem is. I thi...
Yes, but that is in cold weather. If you look at my chart, you will see that I was using around 4kW in the middle of the night (ouch!), but middle of ...
A different heat pump (Midea 14kW) but a stark reminder of what a difference a change in OAT makes to the trailing 60 minute COP (blue line in lower c...
Ideal conditions to collect the data! Although the left hand side of the scatter plot will be empty, the right hand side should be nine and tight, inc...
Good point.
It is the IAT (Indoor) , not the OAT (Outdoor), which needs to be stable! See my paragraph that you quote, it says IAT. Using degree days data inste...
We have discussed this technique in considerable depth in other threads. One important thing, given the underlying premise (energy in to the property ...
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Degrees of Separation
Latest Posts
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The installer visited yesterday and suggested the noise...
By JamesChatz , 8 minutes ago
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RE: Heat Geek installations: share your experiences
I struggled with this problem as well. An independent t...
By L8Again , 43 minutes ago
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RE: Heat pump branding. Clever, contemporary… or a bit too much?
I am not here to defend Heat geek or anyone else, but I...
By JamesPa , 52 minutes ago
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RE: HeatGeek vs Octopus surveys: puzzling disparity - any ideas why?
Your house sounds a lot like mine. 2 surveyors each sp...
By JamesPa , 2 hours ago
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RE: Heat Geek Zero Disrupt: Are We Sleepwalking Into Another Race to the Bottom?
Thats true only if you do the wrong experiment. Done c...
By JamesPa , 3 hours ago
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RE: How should the Boiler Upgrade Scheme be reformed?
@temperature_gradient Isn't that just describing a regu...
By Prunus , 3 hours ago
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@etchedpixels I thought about that too, and between ...
By RonV. , 6 hours ago
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RE: battery storage without solar
As of October 1st they need specific qualifications to ...
By EtchedPixels , 16 hours ago
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RE: Renewables & Heat Pumps in the News
With regards to the BUS grant raid, I gave it more thou...
By ASHP-BOBBA , 17 hours ago
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RE: Why are ASHP installs so expensive?
The whole system seems to work on the basis of...
By ian33a , 17 hours ago
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RE: Missing flow temperature in Heat Geek proposal
Good plan. If you can get half hourly meter readings a...
By JamesPa , 23 hours ago
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RE: Heat Pumps Without Grants: Would You Have Installed One & Will You Now?
@editor Most certainly. The heat pump was an ideal s...
By Abernyte , 23 hours ago
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RE: Does anyone have experience of a smart water meter?
Yep I caught our slow leak from a £100 bill rise 8)
By EtchedPixels , 23 hours ago
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RE: Do You Need a Buffer Tank or Low Loss Header for Underfloor Heating in a Large Property?
@jamespa in some cases, failing the Turing test might b...
By GrahamF , 1 day ago
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