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 17, 2026
Fair enough. Obviously you understand that you will take a running cost hit but all designs are a trade off. 45 is often a good compromise for radia...
I still am not sure you get the point of volumiser tanks. They add water volume to the system. They don't need power. Grant and others take the op...
Are you saying your design flow temperature (at the lowest oat) for the ashp system is 55C? Fans on fancoils do run constantly, but with a decent...
I'm sorry but I don't understand your maths. If you need 2.4-3kW output then you will need a radiator rated for about 6kW at 50C DT. That's a very bi...
I think that's very likely. Thus if you set all external controls to be permanently on you should be able to optimise the wc curve to the lowest poss...
Please post back on how you get on. You need to give some thought to those ufh loops, they can't be allowed to suck energy out during dhw cycle. Re...
They will run without a fan but output is then less than a radiator of same size. I thought you were struggling to fit a passive radiator in hence w...
Could a fan coil be suitable. I had a similar problem which was solved with a fan coil.
Ok that's clearer. It's a pity about the manifold pumps, they effectively stop the ashp having the control it needs to make sure everything works pr...
Thanks, thats helpful. There seems to be a circular path around the upper volumiser, is this correct (it could be, perhaps the upper heat pump is the...
Only to the extent that the heat has been produced at a lower COP than your space heating. But as you are probably talking 1-2kWh max per day, who ca...
I hope and think so. this stuff is quite complex to describe!
SPONSORS
Degrees of Separation
Latest Posts
-
RE: Starting Our Heat Pump Journey: 1962 build 3 bed detached house
@Ian-S, I think @JamesPa’s latest comments are probably...
By Mars , 8 hours ago
-
@jamespa, I think we agree on about 80% of this. Where ...
By Mars , 8 hours ago
-
RE: 'Chinese Diesel Heater' to heat the home .....
Old thread but I'm new to the forum so new to me. How...
By BlizzardGreen , 14 hours ago
-
I'm not sure why you would want to make it more difficu...
By JamesPa , 18 hours ago
-
RE: Mitsubishi Ecodan FTC6 settings
I was just replying when i saw your edit drop in! 🙂 ...
By F1p , 19 hours ago
-
RE: Wood burner with ASHP - direct air?
@lucia FWIW installed a woodburner some years ago. ...
By JamesPa , 21 hours ago
-
RE: Who's your electricity provider and what's your tariff?
@toodles I invested on Miele a pair of frodge frozor wh...
By AgentGeorge , 2 days ago
-
RE: Flushing system, cleaning and inhibitor
Flush and fill all complete. Octopus kindly gave us a...
By Old_Scientist , 2 days ago
-
RE: Do I add Air Con or MVHR to existing A2W ASHP?
I think I saw a diagram for an exhaust air dhw tank wit...
By JamesPa , 2 days ago
-
RE: Indevolt Batteries UK Support & Info Thread
Thanks, however that's an answer to a subtly different ...
By JamesPa , 4 days ago
-
RE: Solar Power Output – Let’s Compare Generation Figures
@toodles Such elegant symmetry. look at my lumpy bag of...
By Papahuhu , 5 days ago
-
RE: PV and battery long payback - sense check query
Quite probably not, but you can get a 32A relay and a S...
By JamesPa , 6 days ago
SPONSORS
