Joining the Renewable Heating Hub forums is completely free and only takes a minute. By registering you’ll be able to ask questions, join discussions, follow topics you’re interested in, bookmark useful threads and receive notifications when someone replies. Non-registered members also do not have access to our AI features. When choosing your username, please note that it cannot be changed later, so we recommend avoiding brand or product names. Before registering, please take a moment to read the Forum Rules & Terms of Use so we can keep the community helpful, respectful and informative for everyone. Thanks for joining!
Last seen: Sep 1, 2026
Of course weather compensation will lower the LWT as the OAT rises, but that rise in that chart is over 12 hours, while an individual defrost lasts mi...
Thanks, that is very kind of you.
I think you will find that the person who introduced the idea that lag might explain some of what we see was me!
But is it rising? Looking at my composite image, it isn't rising at the relevant time. And even it it was, which it isn't, how could a rising OAT supp...
@jamespa — thanks. But the coal is added during the defrost, the shark's fin in energy in happens while there is still 'negative' energy out, ie heat ...
I did try to visualise how the water circulation might somehow influence things eg by mixing, but got stuck on the old train idea, the flow is a serie...
Forgot to post this earlier (wrote it this morning then forgot about it), still worth posting, I hope. Exactly, indeed, as I said earlier: ...
SPONSORS
Degrees of Separation
Latest Posts
-
My wife is in the process of purchasing a BEV, this wil...
By Rusty , 14 minutes ago
-
RE: Problems with sizing a replacement for a Viessmann Vitocal 200-S
OK. If you had two different flow temps and were going ...
By bobflux , 18 minutes ago
-
RE: Adding additional Solar Panels to a DC coupled battery system
@transparent thank you for your reply above. As alway...
By Old_Scientist , 1 hour ago
-
RE: Solar Power Output – Let’s Compare Generation Figures
Possibly useful to look at 3 months Jun, Jul, Aug and c...
By Tim441 , 3 hours ago
-
RE: How Accurate Is My DIY Heat Loss Calculation?
@kilgorexv definitely a larger inverter will help and m...
By AndrewJ , 2 days ago
-
RE: Adventures in heat loss calculations
@rob-of-york — thanks for posting this, all very useful...
By cathodeRay , 2 days ago
-
RE: Surface mount or bury primaries for heat pump installation?
The installation is almost done! I've written up two ...
By tomasmcguinness , 2 days ago
-
RE: Glass lined Cylinder for private water supply
This has turned into a fascinating little rabbit hole. ...
By Mars , 3 days ago
-
RE: Switch suitable to change between two inverter CT's
Last winter my battery ,32KWh, could run the house com...
By Jancold , 3 days ago
-
RE: HeatGeek vs Octopus surveys: puzzling disparity - any ideas why?
Agree with Major. And even if I was very happy with ...
By Batpred , 3 days ago
-
RE: Is the "divide by 2900" rule still valid?
There is another estimator that you could use, a formul...
By Rob of York , 3 days ago
-
RE: To re-pipe or not to re-pipe? Moving from oil boiler to air source heat pump.
@penval, really useful update. After all the discussion...
By Mars , 5 days ago
-
RE: Who's your electricity provider and what's your tariff?
@papahuhu I prefer to look at it simplistically. We d...
By Old_Scientist , 6 days ago
-
RE: Questions about A2A for heating as well as cooling
@rob-of-york I would concur with the underfloor insulat...
By Toodles , 6 days ago
SPONSORS
