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: Feb 7, 2026
@vinceprince our company supplies heat pumps, and have been doing biomass systems for much much longer. What you're describing is called a hybrid or b...
@jennyross a totally blocked filter will stop the heat pump from working (it would give a "flow fault") so I guess that wasn't happening. And it's goo...
@jennyross I like your descriptions, they're helpful. Sounds like metal deposits to me. It's not uncommon to find some in most systems tbh. Are you fi...
@jennyross it's helpful to have a list isn't it! Cleaning filters should be on that list - it's probably one of the most vital parts really (as well a...
@jennyross out of interest did you get an RHI grant? Was your existing system flushed and cleaned out originally? Because building regs Part L, page 5...
The Eddi has nothing to do with the black gunk - this is either caused by the system not being correctly flushed and/or the system not being tested an...
@clairelp I'd expect the primary pipes - which is the ones that connect your heat pump to to the volumiser, to that black and red Esbe valve, and to a...
Additional to all those good comments, especially the pipe clipping one, it might also be worth checking with the installer what the velocity in the n...
@editor my copy arrived at the weekend - I haven't read it back to back yet but I have skimmed through each page. Like you say it's an ideal grounding...
@elton and here's a link
@editor just ordered my copy.... we'll probably recommend it to our local sustainability groups. Until "low temperature heating system design" is full...
@editor I'll defer to Brendon/Heatcol's encylopedic knowledge here when and if he responds in terms of how many compressor starts per hr is too many.....
Latest Posts
-
RE: Air-to-air heat pumps - best models and installers
@ashp-bobba, do I remember correctly that you install A...
By Mars , 7 hours ago
-
RE: A2A vs A2W: Which Heat Pump Would You Pick?
There isn’t as far as I know, @djh, but you’re welcome ...
By Majordennisbloodnok , 11 hours ago
-
RE: Can anyone explain the following behaviour with a Grant Aerona 3 R30 / Smart Controller?
Final Update. Yesterday, I was going through the moti...
By Unsure , 12 hours ago
-
RE: How much can an east/west solar solar system be oversized?
Best performance occurs with PV string near inverter no...
By bobflux , 12 hours ago
-
RE: Forum updates, announcements & issues
Thank you Mars for all your dedication to improvements;...
By Toodles , 15 hours ago
-
RE: Who do I complain to about a poor ECO4 installation, can anyone advise?
Take it one step at a time. If you can get the dhw and...
By JamesPa , 22 hours ago
-
RE: Selling 2 x Kensa Shoebox 7kw GSHP (New)
Hi Jain, we’ve got an ashp so I’m afraid we won’t be yo...
By Judith , 22 hours ago
-
No buffer or low loss header Grant controller in sens...
By JamesPa , 1 day ago
-
RE: Are We Sleepwalking Into Another Race to the Bottom?
That's an amazing job to get all that in there! A truly...
By Batpred , 1 day ago
-
RE: Anyone concerned about GivEnergy?
Thanks for your advice - I'll keep trying with the inst...
By JohnDwyer , 2 days ago
-
RE: Plug and play solar. Thoughts?
I am also yet to find a case where an installation that...
By Batpred , 2 days ago
-
RE: British Gas vs Octopus Energy vs Heat Geek vs EDF vs Aira vs OVO vs EON.Next vs Boxt
This is what I got from OVO. At least it was quick.. ...
By Batpred , 2 days ago
-
RE: IVT greenline HT Plus E - Circulation Pump Constantly On
Welcome to the forums. Irrespective of which brand yo...
By Mars , 2 days ago
-
RE: 7.5kW Heat Loss, But Quoted a 10kW Midea. No Re-Pipe, No Buffer Tank. Does This Add Up?
Oh, how I love these old scientists!I'm in with your 5 ...
By LeJamaisContent , 2 days ago
-
RE: Jokes and fun posts about heat pumps and renewables
@jamespa Someone who is not easily phased I suppose.
By Toodles , 3 days ago
-
@downfield Once OE had removed our gas meter and capped...
By Toodles , 3 days ago
-
Living with a Low Loss Header (Or Measure For Measure, it’s All About the Pump)
I know, low loss headers (LLHs) aren’t necessarily ‘low...
By Toodles , 3 days ago
-
RE: What is the main ‘dictator’ of Agile’s unit price?
After seeing umpteen negative price slots again today, ...
By ChandyKris , 3 days ago
-
RE: The Reality Behind a Failed Heat Pump Installation – and an IWA Insurance Rejection
@ian-w Getting back to the problem in hand, what do yo...
By JamesPa , 3 days ago
-
RE: Solar Power Output – Let’s Compare Generation Figures
@papahuhu Generally, I leave Homely to take care of mat...
By Toodles , 3 days ago
-
@judith, glad you found the story interesting. On eff...
By Mars , 4 days ago
-
RE: New Vaillant aroTherm Plus in black - When will it come to the UK?
The vaillant controller and app do all of that (and mor...
By JamesPa , 4 days ago
