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: Aug 13, 2026
I didn’t see your earlier reply to @old_scientist which goes a lot further in detail. Which is pretty convincing. ive copied it here for a reminder....
There are some compelling arguments for putting the volume on the flow side and I’m almost persuaded. However the emphasis appears more weighted on de...
@jamespa thanks for the thoughtful reply. Would be interesting how the replies pan out.
Great answers @old_scientist. One other query I have with position G is - the location is on the return side…. after the DHW cycle the system feeds 50...
So... where would you install the volimiser? See choices in the attached sketch. I think this will help to resolve some nagging inconsistencies in pre...
If your UFH is a high mass construction you may be able to store quite a bit of heat so you can run the heating above the cycling temperature or to a ...
I recall some basic maths kwh= LPS X DT X SHC Where the SHC is specific heat carrying capacity (SHC of water is usually quoted as 4.2 whereas glyc...
Hi @jamespa I’ve been travelling for a few days and felt I needed to address some unanswered messages from you. I think and hope we just had some ...
Sorry James the radiator output is governed by temperature of the water inside them and the lower the flow temperature the slower and sustainable the ...
I think Rob Berridge states on this episode that you can’t have “too much” radiator capacity on a HP installetion (if you want the quote try 12 mi...
As per Robs comment @robs this is a R290 model which will operate down to 2kwh output…. ironically R290s are being hailed by some as the high te...
- 27 Forums
- 2,756 Topics
- 64.8 K Posts
- 1,190 Online
- 7,159 Members
Join Us!
Installer Finder
Degrees of Separation
Latest Posts
-
RE: Next steps on my ASHP journey: Radiators and Pipework
The obvious thing that springs to mind is that those ra...
By Old_Scientist , 3 minutes ago
-
RE: 7kW EV Charger Options Advice
Agreed. Fitting structured cabling would be a good idea...
By Majordennisbloodnok , 6 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 , 4 hours ago
-
RE: Adding additional Solar Panels to a DC coupled battery system
@transparent thank you for your reply above. As alway...
By Old_Scientist , 5 hours ago
-
RE: Solar Power Output – Let’s Compare Generation Figures
Possibly useful to look at 3 months Jun, Jul, Aug and c...
By Tim441 , 7 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



