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I take it you mean vertically. Roughly the height of the fire-box of the stove itself, ie about 500mm. The difference in height at the heat store end is as you see in the photo, probably about 1m between flow and return tappings. Otherwise all pipe runs are pretty much parallel and...

Tony ("Agile") said: The swept tee is now my equal favourite with another idea I've had, which is to add a zone valve to where the CH flow meets the heat store. This zone valve would normally draw from the heat store, but in the situation I've described it could switch to suck direct from...

Woodwarm "Fireview" 20kW stove with saddle, back and roof boilers.

Bog standard 210 litre direct HW cylinder

doitall says Impasse I'm afraid. It does happen, and short of inviting you round to see for yourself I can't offer any avenue for progress. I don't want to sound rude, but 30 years experience of Engineering has taught me that when my perception conflicts with the evidence it's usually...

I seem to have stirred up a bit of a hornet's nest here! Many responses ask for more detail, so here is some. Firstly the system design. Here is the original schematic diagram which was how I designed it and, in fact, is pretty much how it got built. (Sorry about the size, I'm still using...

This shows the control panel, and helps to clarify the way the system works ... I hope

This was the original design, and is pretty much as it was built

Well guys, it may or may not be possible but I assure you that it happens: the return flow to the stove is hotter than the flow from the stove to the heat store. There are also horrible bumping and rumbling noises from the boilers as the water boils at their base and can't escape upwards...

Oilman wrote Thanks, that's more or less what I thought it would be. I think I can design and make something which will do that - probably open the 28mm flow out to 35mm around the Tee to preserve area, and inject with 15mm or so from the pump, taking the pump inlet from further back along...

Cider wrote: I thought about this, but my long-term fear is that the valve will eventually stick partially or fully closed. Also any sort of valve is going to be an impediment to gravity flow. But it's a possibility. Agile wrote: I think I understand this (sorry for my ignorance...

Firstly thanks to one and all for their responses, taking them in turn: <From Cider> The stove is on the ground floor, and the heat store is in the roof, 2 floors higher, with its outlet about 6" under the tiles, so I can't increase the height. Also the floor is solid (onto rock!) so I can't...

Last December we fitted a fully boilered wood-burner to our central heating system. It's a really simple setup: - Wood-burner heats store (210 litre direct copper cylinder) in roof by gravity convection. - Thermostat on heat store says "I'm hot" when it reaches about 55 deg C. - When...