“I do not recommend wood burning stoves in a building as efficient as a
Passivhaus because of the dangers of overheating, but clients are quite often
insistent and these may be more controllable.”

– taken from http://www.building.co.uk/technical/sustainability/passivhaus/incentives-key-for-passivhaus-in-uk/5019141.article

So it seems that I’m not alone in wanting a wood or multi fuel burning stove in a Passivhaus.

I guess this means it’ll be key to pick a smaller than you’d normally go for “wood burner” so that it can get up to operational temperature, but not cause the house to over heat.