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: Sep 23, 2026
Unfortunately I didn't resolve it. #value cells include E1-AA1, D14, 16-18,20,23,24,31,32,36... but opening it in Libre office calc seems to have f...
About 50% of the play sheet. I'm guessing they all rely on or derive from one 'problem' cell. I have an old version of Excel (2003) it could be tha...
@newhouse87 OK sounds more reasonable then, you are most likely heating the slab. As @derek-m says there is no 'right' figure, it depends on the hous...
I downloaded your modelling tool but there are lots of '#value' in the playroom. Is there something I need to dial in to start it working?
An average 2kW consumption (if that is what it is) at this time of year is a lot. You should be getting a COP of 4 ish or more, which means that the ...
One vital question I should have asked. Is '2kwh per hour' energy consumed (as measured eg by your electricity meter) or energy delivered (as measure...
1kW=1kWh per hour (kWh = kilowatts times hours, ie 1 kilowatt for 1 hour. Kilowatt hours per hour is thus kilowatts times hours divided by hours, ie ...
Consumption is entirely dependent on house construction. My house, a 1930s solid wall build with about 70% retrofitted IWI, 30cm loft insulation, d...
I agree with those who say don't/you cant do it, see regulation 5.4. The only 'get out' is that this is guidance which, 'in the opinion of the Sec...
I don't have the full specs to hand (Grrant don't publish them AFAIK, but Chofu, the oem, might) however a 4:1 turn down for an a2w pump is a good fig...
All a2w heat pumps work this way so far as I know, because it makes sense, Vaillant is no different. Ditto gas boilers with weather compensation. O...
I guess that in principle, with the right plumbing, you could run both together at the ft of the dhw. Lousy efficiency and the output is divided betw...
SPONSORS
Degrees of Separation
Latest Posts
-
RE: Solar Power Output – Let’s Compare Generation Figures
@downfield I was seriously considering Tide Lifestyl...
By Papahuhu , 4 hours ago
-
RE: Passiv Smart Thermostat - Help & Forum Support
Thanks Will. I'll probably be a week or so before get...
By Singlespeed , 6 hours ago
-
RE: Cooling using an air to water heat pump
From experience this summer, a single-split A2A unit on...
By Rob of York , 13 hours ago
-
@mrkfm, I’m definitely not trying to put anyone off get...
By Mars , 1 day ago
-
RE: Why are ASHP installs so expensive?
Posted by: @springswood I confess to becoming a litt...
By Rob of York , 1 day ago
-
Analysis of the economics of switching to an A2W ASHP compared to other heat sources
This post aims to analyse the economics of installing, ...
By Rob of York , 2 days ago
-
RE: Cooling with air to water heat pumps
@editor does that mean you have to have two separate ex...
By mrkfm , 2 days ago
-
RE: Starting Our Heat Pump Journey: 1962 build 3 bed detached house
Posted by: @ian-s Could always use the money saved o...
By Rob of York , 2 days ago
-
Depends on what controls the pump! Thats the whole poi...
By JamesPa , 3 days ago
-
The positive reviews keep coming in for Britain's Heat ...
By Mars , 3 days ago
-
RE: Next steps on my ASHP journey: Radiators and Pipework
I have one of these fitted which also allows you to reg...
By Old_Scientist , 3 days ago
-
RE: Recommendations in Ely (Cambs) area for Full setup checks on Nibe HP setup for House.
If they can't don't give up. Heat pumps are, in reali...
By JamesPa , 4 days ago
-
RE: Missing flow temperature in Heat Geek proposal
Yes that's what would happen by turning down the lsv to...
By JamesPa , 4 days ago
-
RE: Grant R290 DHW Cycle Interuption
It looks like some sort of short pre-run. The question...
By JamesPa , 5 days ago
SPONSORS
