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 3, 2026
@johnmo absolutely agree. However I've had conversations with heating engineers who categorically take a different opinion 🙃
@johnmo That's fair enough. Although I'm not sure how that rule squares with having to use an immersion for legionella in addition to the heat pump.
Im not sure I follow why you are opposed to using an immersion heater for the very cold days? If the price using off peak energy works out to the same...
@johnnyb Hi. Yes I just use the immersion overnight. Although the heat pump could probably get a DHW COP of 3.5 as the price per unit is 3.5 x less ov...
@johnnyb I think potentially you may be right that 8kW will be too large for your heating although the 5kw may struggle with DHW. Can I ask if you...
@scalextrix When do you intend taking the plunge? Do you have next winter to work with to get some good data? If you have the house area and a feel ...
@scalextrix I think what you are describing is exactly why I am so sceptical of room by room assessments and more supportive of previous use estimates...
@guydeb I'm just in the middle of constructing a 40m2 extention myself and looking at the amount of insulation required now I expect the heat loss to ...
@guydeb Yes. No problem running just UFH from an ashp. The issue I think would be the very low heat loss in a 40m2 new extension. How sure are you tha...
@matwin I believe the degree days calculation is an accurate method of assessing heat pump size. Im not sure how much detail the YouTube video goes i...
@scalextrix As @JohnMo says though at lower temperatures they need to be bigger so that will probably be the worse performing one in the CH. Also they...
@scalextrix I cant help with the CH side but you might look at the plate heat exchanger used with a mixergy cylinder to get a handle on the DHW. By al...
SPONSORS
Degrees of Separation
Latest Posts
-
RE: Questions about A2A for heating as well as cooling
Thank you for that very helpful and thorough response! ...
By donciccio , 52 minutes ago
-
RE: Aircon - in listed buildings
@etchedpixels thanks for giving such a full and helpful...
By GrahamF , 15 hours ago
-
RE: Acond heat pump failed after four years - diagnostic quote £940 plus VAT
Another idea if the above don't work - there are compan...
By downfield , 17 hours ago
-
RE: Love veg, hate watering cans
They have their downsides but boreholes are great in th...
By ian33a , 18 hours ago
-
RE: Who's your electricity provider and what's your tariff?
@old_scientist The service engineer powered down the ex...
By Papahuhu , 19 hours ago
-
RE: Issue with Samsung Cascade System
@jamespa It's a funny system, but was out only option l...
By Renewables345 , 23 hours ago
-
RE: HeatGeek vs Octopus surveys: puzzling disparity - any ideas why?
Thanks, I like the chart, very helpful and this will de...
By baroquebank , 2 days ago
-
RE: Solar Power Output – Let’s Compare Generation Figures
Production resumed to normal once the issue ...
By MK4 , 2 days ago
-
RE: Digest of UK Energy Statistics
That sounds painful. It would be much better to charg...
By Transparent , 3 days ago
-
Hole diameter is small but hole length is also very sma...
By bobflux , 3 days ago
-
RE: Are Wind Turbines Really “Losers”?
We were sailing near a wind farm in the North Sea last ...
By Jeff , 3 days ago
-
@trebor12345 The idea is to ensure that Powerwall knows...
By Toodles , 3 days ago
-
RE: Indevolt Batteries UK Support & Info Thread
'hard limited' could be in 'admin' password protected s...
By JamesPa , 4 days ago
SPONSORS
