RE:deezler....
An economical design, super insulated, and passive solar....yep you have low heating requirements. You chose to invest $2k in burning equipment and burn $300-$600 a year in wood.
If your heating needs are indeed that low.....don't know why you were figuring $20k-$30k for Geo.
I installed my system myself. Hired the ductwork out. Taking off Federal and local credits.....I came out at $7k or so. But my Geo does two things most people's.wood burners don't. 1. It heata my matter in the winter AND summer. And 2. It cools my house as well. And given your low heating requirements, you probably wouldn't need anywhere near the 4 ton system I installed. As that 4-tons replaced 6 cord a year. So a Geo sized to your house would be even cheaper.
I didn't see you mention air conditioning. .aube you don't need or want that where you live. But that's not the case for most people.
Alot of the proponents claiming how much they save burning wood......ALSO spent the money for an HVAC system with ductwork and all just for cooling.
I save money NOT burning wood. Sure the Geo was a large upfront cost. That's a given. But I needed (wanted) air conditioning anyway, which the house didn't have. And the cost difference between installing a central AC unit.....and the Geo with all the rebates.....was nil.
And at the end of the day....even if I could save $400 or $500 a year burning.....is it really worth the mess in the house, and the hassle? For me...no.
Now before Geo, I heated with wood for two seasons. The alternative was baseboard heat at $300/month more than the wood. So the hassle was worth it then