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: Jan 7, 2026
@gary I get where you’re coming from. But I don’t think you’re undersized . You’re trying to cram in all the heat your house needs into certain peri...
Hi, I'm saying this from my experience, not as a heating expert: Your compressor is turned off for too long periods. You may think the UFH is at ...
@gary how much UFH and how much rads are you? Whats your screed depth and pipe size?
@jamespa yeah, i agree. The time required to fine tune a system is not economical. I absolutely understand why heat pump companies oversize, stat ...
@jamespa yeah, I agreed. My son’s bedroom is on the ground floor with his sisters room above. I need to keep his room all night to over 20 so the fabr...
@jamespa yep, and this is what I'm doing it's the eveness of the spec. If your going to oversize, do it evenly. BUT, and it's a big BUT, having...
@gary Its not the integral tank, so I have a separate pump. My data from the second 1/2 of the winter is that 11.2 should be OK to cover this ho...
@sunandair I can't get my system higher than 35 or 36 degrees, The only way to do that would be to start to close more of the secondary system off.
@sandman1600 What I mean is, your UFH power is 79wm2 I think, at mean water temp 50, so in your house that is 9. something kw of power. they desi...
@sandman1600 If your heat loss is really 14, and your UFH capacity at mean water temp 50 is 9kw, if they are right, the the pump won’t be your prob...
More like “the heat loss report is the heat loss report” The actual heat loss, well, you’ll have live evidence. if increasing primary flow withou...
Latest Posts
-
RE: Renewables & Heat Pumps in the News
@editor, I hear that too. I can confirm that out of ...
By ASHP-BOBBA , 5 hours ago
-
End-of-Life Heat Pumps: How Do You Dispose of an ASHP in the UK?
As many of you know, our Global Energy Systems heat pum...
By Mars , 5 hours ago
-
@derbygraham fully agree with James, and it’d be good t...
By Mars , 6 hours ago
-
RE: Indevolt Batteries UK Support & Info Thread
Finally got around to installing and setting up the Sol...
By Mars , 6 hours ago
-
Unfortunately its a function of the physics. Max heat ...
By JamesPa , 7 hours ago
-
RE: Microbore heat pump installs
In principle you are almost certainly right, but in pra...
By JamesPa , 7 hours ago
-
RE: Electricity price predictions
@old_scientist We are a low mileage home, so bulk of ou...
By ChandyKris , 8 hours ago
-
There are just too many unknowns for me to comment on p...
By Transparent , 10 hours ago
-
RE: What is the main ‘dictator’ of Agile’s unit price?
@toodles I keep an eye on wholesale prices and energy m...
By ChandyKris , 10 hours ago
-
RE: Brand and installer questions for ASHP
Strange, perhaps it doesnt use modbus which the third p...
By JamesPa , 12 hours ago
-
RE: Upgrading my system, how far do I go?
For comparison, my PW3 with 11.04kW inverter, will char...
By Old_Scientist , 15 hours ago
-
RE: Changes to Tesla Powerwall Charging Regime?
Elon gate - legendary! I take my hat off to you @toodle...
By Old_Scientist , 18 hours ago
-
RE: Mitsubishi Ecodan not good enough ?
Thanks @goody, appreciate the feedback and sorry you ha...
By marcexec , 1 day ago
-
RE: Minimum and Zero Disrupt Heat Pump Installations
True (first sentence) Thats the reason to consider th...
By JamesPa , 2 days ago
-
RE: High air source heat pump running costs – Vaillant AroTherm Plus
Quite right. I was using a rough guesstimate of doublin...
By Majordennisbloodnok , 2 days ago
-
RE: My Grant R290 9kW Heat Pump Installation
Again, really don't know how accurate this is! &nb...
By petch , 2 days ago
-
RE: MCS Quality Audit – Has Anyone Had One? Did It Lead to Remediation?
@toodles The whole scheme is a shocking waste of money....
By Papahuhu , 2 days ago
-
RE: Anyone concerned about GivEnergy?
Many thanks for your, and the subsequent, answers tk qu...
By KevH , 2 days ago
-
RE: DIY or Don’t Touch? Solarman Smart Meter Install
Yes, and these guys would probably be my preferred inst...
By Batpred , 3 days ago
-
RE: Hot water tank lose heat rapidly on random days
@jamespa Hopefully their reasons are well intended! ...
By Bash , 3 days ago
-
RE: Ecoflow UK Support & Info Thread
As mentioned above, we’ve got our full review of the Ec...
By Mars , 3 days ago
-
RE: Say hello and introduce yourself
@sonosppp welcome to the forums. I see you've posted in...
By Mars , 3 days ago
-
RE: Guidance with installing a new heating system
@bobflux Great, thanks for the advice. The pipe has an ...
By Hamilton , 4 days ago
-
RE: Daikin Altherma 3 LT compressor longevity question
@optimistic-optimiser I have has a Daikin for a few yea...
By madsid , 4 days ago
-
RE: UK DIY Battery: SEPLOS 48V 200Ah x2 + Sunsynk 8K – Safe Installation for Garage Conversion
The rule of thumb is to ensure that you can isolate any...
By Transparent , 4 days ago
