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: Mar 20, 2026
@cathoderay For what is worth, it was recently pointed out to me, in a Greek heat pump forum, that certain high-end manufacturers, like Hitachi or Dai...
I think I am short of radiators, as I have not done any changes after switching to heat pump from oil burner. Or I am doing something else wrong. &n...
Yes, it does not cycle and I use a buffer, as shown in Midea's diagrams for 2 zones. To use LWT below 35, you could "fool" the system by defining UF...
I do actually, but I don't yet run it in an "unconventional" way. This is a latest plot of operation: I have switched to UFH mode to see what happ...
Hi all. I have made some progress regarding cause of cycling. First thing I noticed, is that cycling is exaggerated when set LWT is less than 40 C....
@benson thanks a lot.
@benson My system is a "simple" one: no DHW, no defrosts, no decontamination. So it is rather easy to decipher control logic. Would it be possible to ...
Please excuse my persistence, but I am struggling to understand what triggers the pump on-off. I presume it is some internal check or external signal....
@mosibi I confirm this and the value in my machine (R290) is 35. But this is for radiators, If you tell it you use UFH, it will get lower. In fact it ...
@cathoderay How come water at 35 ish C flows through an IAT of 21 C and does not lose heat ? Is there a buffer or a secondary network with its own p...
@cathoderay If I can see correctly, there are periods on the graph where LWT equals RWT and during those periods the unit shuts. If this is the case, ...
I wonder why it is cycling ? I thought this should be avoided. Is some thermostat intervening ? Is the unit oversized ?
SPONSORS
Degrees of Separation
Latest Posts
-
RE: Where heat loss surveys seem to go against practical reality
@cathoderay I started to record oil usage per month on ...
By ian33a , 2 hours ago
-
RE: Next steps on my ASHP journey: Radiators and Pipework
@bobflux The hydraulic simulator is very interesting...
By Rob of York , 6 hours ago
-
RE: 7kW EV Charger Options Advice
Thanks. Yes, we have patchy 4G. The only option we had ...
By Rusty , 11 hours ago
-
-
RE: Being screwed over by Volkswagen Audi Group
Thanks, @batpred. That integration is the one I have in...
By Majordennisbloodnok , 1 day ago
-
RE: How Accurate Is My DIY Heat Loss Calculation?
@batpred I suspect it will be more this year. I had 9 ...
By AndrewJ , 1 day ago
-
RE: Surface mount or bury primaries for heat pump installation?
@jamespa It's rusting 🙂
By tomasmcguinness , 1 day ago
-
RE: Glass lined Cylinder for private water supply
Thank you, once again, for your replies. Yes...
By ian33a , 1 day ago
-
It’s been out a few days and Amazon has already attache...
By Mars , 1 day ago
-
RE: Missing flow temperature in Heat Geek proposal
Yes, and this is another point I agree. We did find a f...
By Batpred , 1 day ago
-
RE: Problems with sizing a replacement for a Viessmann Vitocal 200-S
A very good point. In effect, the DHW pipework is an em...
By cathodeRay , 2 days ago
-
RE: Solar Power Output – Let’s Compare Generation Figures
@tim441 Here are those same three month periods for 202...
By Toodles , 3 days ago
-
RE: Adding additional Solar Panels to a DC coupled battery system
@transparent thank you for your reply above. As alway...
By Old_Scientist , 4 days ago
-
RE: Adventures in heat loss calculations
@rob-of-york — thanks for posting this, all very useful...
By cathodeRay , 6 days ago
SPONSORS
