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: Oct 26, 2026
I agree that the close alignment of the theoretical and practical heat loss calculations that I did for my house may be rather fortuitous. However,...
Thank you all for the positive comments. I have made a simple spreadsheet that implements the practical heat loss calculation that I hope will be of...
There is another estimator that you could use, a formula from Michael De Podesta's , which is simply annual gas usage divided by 57.3 multiplied by th...
@kilgorexv I think you are missing something in your heat loss calculations - the effect of thermal bridging. Thermal bridging is when you have joins ...
@Mars Good questions! The downstairs unit did the majority of the heating in winter, as this was overnight taking advantage of cheap rate electricit...
@toodles I would recommend an A2A system. We have Daikin Comfora units (2.5 kW and 3.5 kW). On the hottest day of 2026 the system dumped 36.5 kWh of...
@donciccio I would suggest that you take a "fabric-first" approach before embarking on your journey to get an A2A for A2W system installed. There ar...
SPONSORS
Degrees of Separation
Latest Posts
-
RE: The Changing Jet Stream Could Challenge UK Air Source Heat Pumps
And for a bit of context 1962-63. The winter of 196...
By hml1827 , 4 minutes ago
-
RE: Electrical works for air to air heat pump
Electrical works are well regulated and most installers...
By JamesPa , 35 minutes ago
-
Are there any comparisons of DHW heat stores around?
I'm now starting to look for a replacement for my gas c...
By SarahEmmm , 2 hours ago
-
RE: 15kw pump for 225m2 1990's house - over kill?
@seaviews I have read you latest response re buffer ...
By JamesPa , 16 hours ago
-
RE: How will removing the standing charge on gas bills benefit heat pumps?
The BUS grant funding for 2026/27 will run out at the c...
By Rob of York , 1 day ago
-
-
@editor Ouch, sorry to re start the tick. I had assume...
By DavidB , 3 days ago
-
RE: Say hello and introduce yourself
@e-a-west as the good Major said, welcome to the forums...
By Mars , 3 days ago
-
RE: How much of your renewable and home setup would still work if the internet went down?
Yes I actually have a copy of a tool that whenever a ce...
By EtchedPixels , 3 days ago
-
RE: Indevolt Batteries UK Support & Info Thread
@editor Hi, To resolve this, please tap on the A...
By Indevolt Tech , 3 days ago
-
RE: Double or Triple Glazed Windows?
Posted by: @singlespeed With 9 years repairing windo...
By Rob of York , 4 days ago
-
@transparent we’re still running a secure version of PH...
By Mars , 4 days ago
-
RE: How quickly would you want/expect heat recovery to take from setback?
Much longer than that here. The heating isn't even on. ...
By bobflux , 5 days ago
-
RE: Passiv Smart Thermostat - Help & Forum Support
Obviously the weather is changeable but there's a defin...
By Singlespeed , 5 days ago
SPONSORS
