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Last seen: Oct 21, 2026
Glad to hear that you are pleased with the heating of your house and generally happy. It may well be that there is scope for a bit of optimisation of...
Similar really, rads 5C lower than output of ASHP = 10-15% penalty. Difference of 2C on the return possibly a measurement error. I think @toodles mig...
OK, so 41.9 in from heat pump, 37.1 out to rads, drop of 5C = 10-15% efficiency penalty. Not sure how the return to the heat pump is higher than the ...
To the final question yes. If the HP is delivering 43 and through to rads its 37, then you are losing about 12-20% in efficiency as a result of the...
If the rads are sized correctly then I would normally say that it could (most probably, but not certainly, is) be an emitter balancing issue. However...
OK, the most interesting thing is the temperature drop across the buffer measured between flow from HP and flow to radiators. I dont think I can see ...
With a very low loss house running at very low flow temperatures its true that the reduction in efficiency from running at the only slightly higher fl...
FWIW my boiler did the same. Sometimes I heard it coming on at 3am in the morning. It heated as well during these forced 'on' periods. But yes, if...
Yuk (comment on the LLH) In this case surely the secondary must be kept running during defrost, otherwise the only water volume available for defros...
Good luck on the modbus. I think you are in with a good chance, these units are based on aircon units used in commercial settings where modbus will l...
... and the value for air changes. Judging by posts on this forum and elsewhere, and comments from a handful of some more independently thinking ins...
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Degrees of Separation
Latest Posts
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There has been a flurry of activity surrounding NESO ov...
By Transparent , 45 minutes ago
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RE: How quickly would you want/expect heat recovery to take from setback?
Much longer than that here. The heating isn't even on. ...
By bobflux , 3 hours ago
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RE: Passiv Smart Thermostat - Help & Forum Support
Obviously the weather is changeable but there's a defin...
By Singlespeed , 3 hours ago
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RE: Double or Triple Glazed Windows?
It is very comforting to see the condensation on the ou...
By Toodles , 3 hours ago
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RE: The Changing Jet Stream Could Challenge UK Air Source Heat Pumps
@rob-of-york I must admit that when we had a Daikin hea...
By Toodles , 4 hours ago
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RE: Forum updates, announcements & issues
Get the Renewable Heating Hub heads-up on WhatsApp. I...
By Mars , 5 hours ago
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RE: Safety study for plug in batteries out to tender - looks like Q3 2027 at best before legal
@editor I pointed out to the one of the Fuse execs that...
By dansus , 5 hours ago
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RE: 15kw pump for 225m2 1990's house - over kill?
@seaviews As well as loft insulation, there are othe...
By Rob of York , 7 hours ago
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RE: How much of your renewable and home setup would still work if the internet went down?
On the money, @editor. Until manufacturers stop actin...
By Majordennisbloodnok , 8 hours ago
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RE: Indevolt Batteries UK Support & Info Thread
Google Cloud outage: Let's not jump to the conclus...
By Transparent , 8 hours ago
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RE: BT cuts you off, Plusnet blames Openreach... welcome to “seamless” broadband switching
Both of which (in most cases) use Openreach for the las...
By JamesPa , 8 hours ago
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RE: Renewables & Heat Pumps in the News
Yes, this is a swiss and german standard I believe, Vai...
By Batpred , 23 hours ago
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RE: Octopus Cosy 12 Heat Pump Regret: Incredibly Loud, Poor Heating & Constant Hum - Help!
@editor FWIW my problem was resolved, eventually, after...
By BigFish , 1 day ago
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My heating has been off and DHW on throughout the summe...
By DavidAlgarve , 1 day ago
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RE: Anyone concerned about GivEnergy?
The GivE forum seemed to have survived the collapse of ...
By downfield , 1 day ago
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