My grandmother is thinking of having a woodburning boiler installed.
The idea being that this will (a) give a safe fire that can be opened at
will to reveal an open fire and (b) heat dhw & ch to supplement her existing
oil burner.
I've had a look around but most woodburners seem to be just that,
woodburners or room heaters. Many of these can have heat exchangers fitted
to provide heat to water.
My parents have a dedicated woodburning boiler. Swedish design but 25-30
years old and the makers long defunct. Superb and still going very strong.
Basically a steel tank filled with water which is connected into the
plumbing. Inside the steel tank is a firebox with flue, riddling, ash
removal arrangements and a glass front door.
Does anyone know of a similar decent product that is available today?

Also, any pratfalls or other recommendations that we should be aware (or
beware) of?
Also considering a Dunsley neutraliser but don't know if this is neccessary.
Spark arrestor at top of flue. Good or bad idea and insurance implications.
The property concerned is thatched.
Thanks
Jonny