A Wood Stove in a Passive House: Feeling Warm Already!
Have a look at the stove in question below, the Walltherm gasification boiler (www.waltherm.ca). The picture below illustrates the back of the stove.
It has a sealed combustion chamber with an air intake at the bottom that is ducted to the outside. It is a closed combustion system. This is a necessity in a passive house for several reasons
1. Draft in the chimney requires air to be pulled into the stove. In a super tight house, the draft necessary to keep the stove going will be hard to make up if the walls are too tight, required a window to be opened while burning the stove.
2. Dangerous backdrafting could expel dangerous carbon monoxide into the space. With normal code built homes this is dangerous enough. If the natural air exchange rate is 10 times less, you'll be feeling sleepy pretty quickly!
Having a carbon monoxide monitor is a necessity for most homes and a passive home is no exception.
Below is a schematic of the living room. The wood stove was meant to sit adjacent to the kitchen/living room wall. The air intake duct was going to be poured under the slab and out to the south side of the house where it would come up from under ground. It would work but coordinating the air intake with the chimney placement proved to be more complicated than originally planned.