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: Oct 1, 2025
@kev-m Sorry My mistake re The COP, I missred the graph. 😖 That sounds great, I think you will find a huge diffreance. @morgan, 25 - 45 is 2...
No, it is still like driving a car in to a 100 mile an hour head wind. This is what they look like inside and this is how they work, the water ...
@kev-m Thanks Kev, I will try to be gentle!! 😀 You have just given me all the evidence I need to prove that you are running your system incorrectly....
@markc You only need 1 valve to divert the water from heating to hot water. I have left the one in your anex as you may not use it all the time and wi...
@batalto Nice indication of the implacations of flow temperature, try to drop your curve even further and disable all you other levels of control by t...
@markc do not expect to improve your COP very much, if you do not do anything. By the way, you only need 1 valve and about 3 hours of a good plumbers ...
@markc So changing the synchron valves for diverter valves makes the change that the hot water flow is no longer stopped, but allowed to keep flowin...
@markc Your system is very cloce to what it should be. Here are the alteratins that need to be done, chiange your control to full weather compensation...
@editor Looks an interesting system. From to pictures it appears that you have 3 pumps running in addition to your pumps in the heat pump and boiler. ...
@editor Yes, yours is a combined unit, Hot water cylinder at the top and buffer on the bottom. A good cylinder, I use them sometimes if the system i...
@editor Mars, can you give me a picture of the pumps and valves ect cut from your picture.
@editor Yes it is possable, ther are some combined units on the market.
- 27 Forums
- 2,749 Topics
- 64.7 K Posts
- 1,741 Online
- 7,157 Members
Join Us!
Installer Finder
Degrees of Separation
Latest Posts
-
RE: Do I add Air Con or MVHR to existing A2W ASHP?
@rob-of-york Thank you, I’m thinking along these same l...
By Toodles , 37 minutes ago
-
@Mars Good questions! The downstairs unit did the maj...
By Rob of York , 37 minutes ago
-
RE: Questions about A2A for heating as well as cooling
@donciccio I would suggest that you take a "fabric-fi...
By Rob of York , 1 hour ago
-
RE: How Accurate Is My DIY Heat Loss Calculation?
Any idea how efficient your gas boiler is? Is it a 50 y...
By Old_Scientist , 6 hours ago
-
RE: Volumisers in Heat Pump Systems: Does Placement Matter?
@dave, I think @jamespa has probably identified the mos...
By Mars , 18 hours ago
-
RE: Plug and play solar. Thoughts?
My thought is simple. Bring it on and bring on plug in...
By JamesPa , 1 day ago
-
RE: Heat Geek mini store vs pump size
Yes I agree, that’s why Heat Geek have most likely sele...
By Tomtheheatingengineer , 2 days ago
-
RE: Who's your electricity provider and what's your tariff?
@chandykris Swings and Roundabouts, you win some…. ...
By Toodles , 2 days ago
-
@tomtheheatingengineer, thank you, and welcome to the f...
By Mars , 2 days ago
-
RE: HeatGeek vs Octopus surveys: puzzling disparity - any ideas why?
@majordennisbloodnok @tomtheheatingengineer For my ...
By JamesPa , 2 days ago
-
RE: Is the "divide by 2900" rule still valid?
Really flow rate is a pipework limitation not a water p...
By JamesPa , 3 days ago
-
RE: The good, the bad and the not that great – my heat pump installation
@burtis, I’ve followed this thread pretty much from the...
By Mars , 6 days ago
-
RE: Starting Our Heat Pump Journey: 1962 build 3 bed detached house
First time poster here but I can share my experience as...
By SCH , 6 days ago



