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 26, 2026
So if I understand it correct while in DHW mode, the main ASHP pump (1) has to go through the DHW circuit in the cylinder and then pull through the no...
To add red circuit is DHW and blue is heating
@cbrenewable Lets get to the modes and setting a bit later, sorry to ask but I need to make sure I understand the circuit that has been made. can you ...
Try to find a very good company that can teach you the basics in general heating and plumbing, try to then get on a couple of courses that specialise ...
@editor I thought it was great, I was more focused on what questions the other experts were issuing and wondering what questions I would have offered ...
@cbrenewable Can you look on the side of the pump body, should be an arrow showing direction? please have a look at both pumps if you can, TBH even if...
I thought I would take your test and support you with £5 🙂 Please to say I scrapped past the 80% lol cert attached for fun.
I am initially thinking it looks like you have one pump pushing through the other if the flow and return are as I placed the arrows?
@cbrenewable So just to make sure, from the picture it look like the arrow I have drawn?
@cbrenewable is the return pipe to the external unit the pipe with the filter showing in the picture?
Hi CB, everything you are describing here is a lack of heat transfer, it will not matter if you have 24,21 or even 12/Lpm flow rate at the optical sen...
@grantmethestrength Oh sorry to hear that, there should not really be leaks and clunking valves from a new installation, I assume its new as you have ...
- 27 Forums
- 2,767 Topics
- 65.2 K Posts
- 727 Online
- 7,169 Members
Join Us!
Installer Finder
Degrees of Separation
Latest Posts
-
RE: Who's your electricity provider and what's your tariff?
@old_scientist Yes but those predictions were based ...
By Papahuhu , 23 minutes ago
-
RE: Starting Our Heat Pump Journey: 1962 build 3 bed detached house
By Ian S , 39 minutes ago
-
RE: Is it the house or the equipment?
Thanks for that @rob-of-york. The two way split I descr...
By springswood , 41 minutes ago
-
RE: Next steps on my ASHP journey: Radiators and Pipework
If it's a separate contract then it would not be zero r...
By JamesPa , 3 hours ago
-
RE: Siting of the external sensor on a heatpump
Of course had the heat source been a heat pump it would...
By JamesPa , 13 hours ago
-
Never assume, it makes an ass of u and me! OK, tha...
By JamesPa , 14 hours ago
-
RE: Recommendations in Ely (Cambs) area for Full setup checks on Nibe HP setup for House.
In fairness all heating has cost a lot to run in recent...
By JamesPa , 16 hours ago
-
RE: Navigating the World of Refrigerants In Heat Pumps: A Guide for Homeowners
Indeed we are invvestigating AC at present and are havi...
By Toodles , 2 days ago
-
No, but the heat pump must be capable of delivering a S...
By JamesPa , 2 days ago
-
RE: Daikin ESPAltherma and Home Assistant installation
It's laziness lol The PV system is very chatty, meter...
By bobflux , 3 days ago
-
RE: Problems with sizing a replacement for a Viessmann Vitocal 200-S
R (The R Project for Statistical Computing, I use it wi...
By cathodeRay , 3 days ago
-
RE: Vaillant Arotherm Plus 7KW need a service on it
booked it with Vaillant. will use them until i can find...
By AdamK , 3 days ago
-
RE: Adventures in heat loss calculations
I have seen it stated that the declared calorific value...
By JamesPa , 3 days ago
-
RE: Two heating zones to one zone
@transparent Many thanks. The garage is fairly well ...
By Profzarkov , 4 days ago


