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Last seen: May 18, 2026
That seems high. Do you know what your WC settings are (even if you cant change them and even roughly?)
Very much agree with this! Sometimes the way to get things to operate in pure WC mode is to set the curve on the controller, then just turn all the ...
Thats sensible then Most heat pumps seem to limit adjustment of the WC settings to installer mode, although some do expose something to ...
Fair enough and Im not trying to circumvent regulation, I was just checking that I understood the underlying cause for your comment and that I hadn't ...
Assuming your house was heated previously your oil consumption indicates a loss of more like 4-7kW, so an 8kW unit would probably have been perfect as...
So thats a regulatory matter not technical? The Sunnyboy has no CT. If the CT for the battery inverter is on the incoming main then it does know th...
@transparent Thanks perhaps mine is G83, cant actually recall (I will check). Its a SunnyBoy SB4000 I have PV, Im considering a...
I think it is most unlikely indeed that it cant run on pure WC, there will almost definitely be a config/wiring option to disable room influence entir...
Firstly you need to recognise that December through February are very cold and so you will inevitably have MUCH higher bills in these months, probably...
@transparent thanks thats really helpful, particularly the diagrams. In the G100 case I presume that the inverter must be specifically G100 certified...
In this case you need to use average OAT and energy supplied to the house (as opposed to energy consumed) to do the calculation. You then get the los...
If you consume 10kWh in 3.5 hours at a COP of 2.5 then the 'calculated heat loss' is 10/3.5*2.5=7.1kW which quite plausible. However 3 Hours is pro...
Latest Posts
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RE: UK warm homes plan - how can it be delivered?
@bobflux My view is that regulation for consumer pro...
By Batpred , 2 hours ago
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Hi Mars, I've sent you a request to connect me with a...
By sttpd1917 , 3 hours ago
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RE: Sizing an ASHP; Heat loss and kW
Annual consumption is almost certainly better than an E...
By JamesPa , 7 hours ago
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Grant Aerona R290 (15.5kW) - How is DHW Target Temp calculated?
Hello all, We have just had a Grant Aerona R290 insta...
By TaffontheTaff , 8 hours ago
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RE: Setback savings - fact or fiction?
Indeed, I can well imagine that a heat-pump based syste...
By PeterWurmsdobler , 11 hours ago
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Loud noises in the night - and one for the toolbox?
I was woken at 5am on Sunday to a very loud noise, akin...
By JamesPa , 12 hours ago
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RE: Advice on Vaillant Sensocomfort
The latest Vaillant announcement I saw said that they w...
By JamesPa , 13 hours ago
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RE: Debugging my legionella immersion heater
I notice this (66 is rather hot) with my legionella cyc...
By JamesPa , 1 day ago
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RE: DIY Heat Pump Installations: Navigating Legal and Regulatory Hurdles
@transparent I thought you would spot that wind turbine...
By Batpred , 1 day ago
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RE: Octopus Cosy Heat Pump Owners & Discussion Thread
@swwils there is no logic to oversizing a heat pump. It...
By AgentGeorge , 1 day ago
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RE: Vaillant Sensocomfort Time
Thank youy for the pointer. I think I have managed to ...
By ispookie666 , 2 days ago
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RE: Forum updates, announcements & issues
I have been doing a lot of work on the site lately and ...
By Mars , 2 days ago
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@majordennisbloodnok good advice, thanks for that.
By David999 , 2 days ago
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RE: My Grant R290 9kW Heat Pump Installation
I am following this thread with great interest and than...
By TaffontheTaff , 2 days ago
