Combining a wood burner with lpg boiler - ideas?

[SimonG]

There's no need to reinvent the wheel. Systems exist already that are proven and safe.

 

[Best]

Pumps don’t use much electricity and nothing beats their ability to push heat around radiators.
However, if a log burner is installed on a floor level below rads, then carefully installed gravity circuits will work well.
A failing open zone valve is also a possibility

 

[Plumbagain.]

Old house gravity heating....
Gravity hot-water heating | Old House Web

No electric needed.
But if you are off grid, how will you power the lpg boiler?

 

[Best]

I actually like the simplicity of a gravity system. Makes sense on a solid fuel system on a compact house, so that you have heat even in a power cut.
The flow will constantly put air into radiators if pipes are wrongly teed off from primary flow pipe vertically.