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The trouble is that the only way for me to have the boiler come on is by using the Warmflow boiler thermostat (see image below). This connects to HW ON terminal 3. That is the only way to invoke the boiler as far as I can tell. Terminal 4 (CH ON) connects to both Wilo pumps to push water out to...

Thanks again for the detailed reply. There are 13 radiators with TRVs in the house and 2 without (which will run constantly whenever the CH is on as there is a damp problem in that room). Our first month's oil bill was £300, hence the urgent need to look at this. All radiator TRVs are old and...

Firstly, thank you everyone for the responses. They've been extremely helpful and I really appreciate you taking the time to post. The above quote is exactly what we have I think. We can have Hot Water (HW) without Central Heating by hitting the "Summer switch" as this turns off the Wilo 2...

Thanks for the quick reply! Ok, here goes...

If anybody could offer some insight into what the previous owners did to this central heating system I’d be grateful. Have just moved in and cannot figure it out. How can I fix this mess and just have hot water and heating separated, as they should be? Anyone have a clue what is happening here?