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: Nov 11, 2026
@jamespa Hello James. I am a little "under the weather" literally and metaphorically, so delayed response. 1 - The approximately 2m of 25mm pipework...
@jamespa There are two 22mm flow and two 22mm returns shortly after rising from the heat pump where 25mm composite material pipework is used. I think ...
@jamespa Hello James and thanks again. The rads are connected in parallel and there are two runs of 22mm running down the sides of the house, in the...
@jamespa Thank you James, both for the comments and removal of my post made in error. Before answering your questions I think I should say that the...
@jamespa Thanks for your comment James. Of course you are correct and I think I was suffering a little brain fog in suggesting that the pumps were bot...
With the input from @f1p and @jamespa I am persuaded that my problems are all related to low available flow rate, particularly as I have a record of a...
@skyecraig Many thanks. Could you please describe where we are after carrying out any mods and what is necessary to restart?
Back working again now and problem was air in system. Flow rate is 17 l/min Answer to question re flow rate put to Mitsu UK (Portugal is useless): ...
@f1p Yes understand that but why. Investigating air in system
@jamespa Regretting I attempted this now. A very small amount of dirt in the filter, but L9 error now and won't start.
Is this a cross post with someone elses suggestion? I'm not sure we wanted to - i haven't checked the Hydrobox schematic as to see if there is a zone ...
SPONSORS
Degrees of Separation
Latest Posts
-
Should I change my cylinder when changing from a gas boiler to a heat pump.
I have 178 L Gledhill unvented cylinder which was fitte...
By David , 6 hours ago
-
RE: Plug and play solar. Thoughts?
Impressions so far from the one I've installed are that...
By EtchedPixels , 7 hours ago
-
-
@batpred The Daikin temperature probe protrudes from th...
By Toodles , 11 hours ago
-
RE: Air source heat pump roll call – what heat pump brand and model do you have?
@editor And as an occasional contributor, may I say wel...
By Toodles , 13 hours ago
-
RE: Should Households Who Can Afford It Pay More for Energy to Help Those Who Can't?
They don't have to try. Our entire system is d...
By EtchedPixels , 13 hours ago
-
RE: Why don't people choose heat pumps?
Fair enough. I guess I was thinking of pipes that run ...
By JamesPa , 13 hours ago
-
RE: How Can I Prove Coal Was My Main Heating Source Without Receipts?
Got excepted for the grant now so thanks for the replie...
By Chilli304 , 17 hours ago
-
Daikin Altherma 3 R F+W, room thermostat control, weath...
By JanHarley , 18 hours ago
-
RE: Buffer tank on a 2 x 14kw Ecodan system
Pretty much as I had guessed in my crude scaling from m...
By JamesPa , 21 hours ago
-
RE: Help me keep the faith with my air source heat pump installation
Well you have a vibration generator running at some fre...
By bobflux , 1 day ago
-
RE: Who's your electricity provider and what's your tariff?
@downfield Thats a decent rate, I’m shocked they hadn...
By Papahuhu , 2 days ago
-
RE: Adventures in heat loss calculations
@toodles thanks! So as suspected, around a doubling of ...
By SusannaSaunders , 3 days ago
-
Six books in three years and I think I’ve now covered j...
By Mars , 3 days ago
SPONSORS
