Water coil retrofit to stove

[mr brightside]

I think it's going to be get rid of the insulated ducting and go with 300degC uninsulated 100mm flexible ally all the way through, with a metal grille at the end instead of a plastic one. I'm not sure what fan to use, though, a small centrifugal with an external motor would be ideal, but other than that the only thing on the market is a high temp inline. I'll also have to insulate the whole lot as a separate operation.

I've retrofitted the new stove pipe with baffles and fins to turn it into a sort of improvised heat exchanger. It's surprising how hot the air gets, it's cooked the inline 12v blower to death so now i've got nothing temporarily.