WV Mountaineer
ArboristSite Lurker
On power outage the primary air damper shuts down thereby slowing down your combustion considerably.
You could force it open I presume but with the forced air pushing the heat it'll just sit in your ductwork.
You could do like the Amish. Remove the blower and build a large inverted funnel like plenum with a large floor grating to get the heat upstairs.
Last solution is a generator backup.
Convection will carry the heat up through the duct in an emergency to at least keep everyone from freezing. I was more concerned about damaging the firebox by holding the damper open and then voiding any warranty.
I actually did something like that last season only without the funnel like plenum. I ran the return to right above the wood stove and just opened it up. Not the best solution but could heat my entire house with an old hunter wood stove. I had no idea it was an Amish concept.