Forced air outside woodburner?

Ya it can be done but it's not easy as you need to insulate both the supply and return air to keep moisture low, below the dew pooint, so you don't get a mold growth.

Another consideration is your current heat exchanger is 15yrs old and just about the right age to start leaking. May be right after you move the unit outside would be my guess.

I'm not a fan of the liquid to air heat exchangers using antifreeze as a transfer medium as the effeicency is low comparred to a straight water system using a differential controller for freeze protection. Of course area location can cause alot of design changes.

T_Bone

• Outdoor Wood heating

I installed a hot-air wood furnace in it's own room attached to the house and it is connected to the hot-air furnace in my basement. Total run from furnace to furncace is about 40'. I used flexible plastic drain pipe with flexible-insulated heat-duct pipe inside of it - and buried it. It has worked fine.

If you decide to hook hot-water to hot-air it is pretty straight forward. If you decide to hook hot-air to hot-air it gets more complicated. You must fabricate a back-flow device so either furnace can be used independently if desired.

I dismantled several solar systems that used that method to get heat into a forced air system. Looks a lot like a truck radiator. Only saved the one that I'm going to use in our next house. That will be a wood-fired boiler (inside) used as a backup heating system to add some heat to our air system if the primary heat has a problem. My houses don't resemble most in that they require almost no heat (or AC) to start with. But the principle's the same.

Kind of a long trip here, but I have a huge surplus wood-fired boiler. Turned out to be way too large for my needs.