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: Jul 9, 2026
This is part of the Grant's 'frost protection' system (as opposed to the 'defrost cycle' which we're all familiar with in this type of weather!), whic...
Same to you. Thanks for providing this forum for people to learn from and to teach each other. Here's to a higher COP and a lower energy bill in 2024!
@heat_help Hi. You seem to be saying "flow rate" at some points and "flow temperature" at others? As you probably know, the flow rate on a Grant is fi...
@jwilliams89 The house is around 150m2, split 110/40 (it's a converted bungalow, which is why the split is so unbalanced). Hence the K3s are downstair...
@jwilliams89 From my experience, the radiators were sized correctly. I have 5 (I think) large K3s downstairs. One is 84Kg empty, so you need something...
@allyfish This sounds very positive, although I'm a little sceptical at the moment. I hope they can retrofit these better controls, as the current one...
I believe 'holiday mode' achieves the same thing i.e. during the times you mark as holiday, a fixed temp target is set. This tends to be controlled by...
Good that they are discussing EPCs and how they don't favour ASHPs. The whole EPC rating system is a joke at the moment - no training, no standards, ...
@jwilliams89 As someone who's had a Grant installed under ECO4, part of the problem (I suspect) is in the company trying to tick all of the required b...
I'd echo what @allyfish said. I too have a 10kW Grant, and about 150m2 to heat. During the cold snap I was consuming 50-60kWh per day, and this didn't...
@editor I think it's important to focus on "energy used" rather than COP. HP owners tend to focus on COP, which is quite a novel concept for non-HP pe...
I've been bending my brain trying to balance my LLH (Grant install one by default these days it seems - I suspect to ease the installer's job from wha...
SPONSORS
Degrees of Separation
Latest Posts
-
RE: Volumisers in Heat Pump Systems: Does Placement Matter?
@dave, I think @jamespa has probably identified the mos...
By Mars , 3 hours ago
-
@kilgorexv, I actually think doing your own calculation...
By Mars , 3 hours ago
-
RE: Plug and play solar. Thoughts?
My thought is simple. Bring it on and bring on plug in...
By JamesPa , 17 hours ago
-
RE: Heat Geek mini store vs pump size
Yes I agree, that’s why Heat Geek have most likely sele...
By Tomtheheatingengineer , 1 day ago
-
RE: Who's your electricity provider and what's your tariff?
@chandykris Swings and Roundabouts, you win some…. ...
By Toodles , 1 day 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: Do I add Air Con or MVHR to existing A2W ASHP?
There is scope for product development here. I for one...
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 , 2 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 , 5 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 , 5 days ago
-
RE: Is it the house or the equipment?
...which, I've found out, is pretty much impossible to ...
By Majordennisbloodnok , 6 days ago
SPONSORS
