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Thanks for the comments - I'm away at the moment but back later today, so I'll try to answer all the questions then - I don't want you to think I'm just ignoring them.

So, the conversation on this thread yesterday has been really useful, as it made me observe the behaviour of the system more closely than usual. I think we are getting closer to the crux of the issue - so thanks for the contributions. So, behaviour is very much, only using the wood burner...

@mcmoby69 Thanks for your reply - as additional info, the recommended temperature of the store, at the control stat is 70-75 degrees. The affect of the 'pumping over' is that it appears to cool the top of the store, so that the store overheat stat at the top of the store will often record a...

Yep - there is a return from the dump rad - I've put this on the diagram as well (I think this is correctly drawn). I've just checked the dump and bled it - there was no air trapped. There's probably a 3m near horizontal run to the dump radiator (flow out from woodburner is on one side of the...

@Johntheo5 As far as I can tell, the stat is opening the valve and starting the pump at 75 degrees - the thermal cut out in the store is 85 degrees (we never get that hot at the top of the store to see if that needs adjusting higher, due to the pumping over). This evening I have tried the...

@oldbutnotdead Here's the schematic - if you let me know what else needs to be added, I can do that. The central heating is missing - I don't know if that is important. But basically, there are two manifolds that are fed from the thermal store. One manifold is next to the thermal store and...

Thanks for the reply - I'll try and draw a quick schematic. I haven't previously considered a loading valve - I'll have to check out that option. You're right though, we do have a pipe stat on the woodburner pump. The pump is also in the feed - not the return (also something I hadn't considered!

I'm looking for help with an open vented central heating system that is pumping over. We have a thermal store that has two heat sources - gas central heating, and a wood burner - both feeds are pumped with a Wilo Smart A 25/4-130 circulation (one pump per feed). When the wood burner kicks in...