Johhny Electriglide wrote:
Super-insulation is great, but total air tightness can lead to poor indoor air quality.
heat recovery ventilation units (HRV) are required for air tight buildings (air-to-air heat exchangers). Also, this video is about Germany so I am assuming a colder climate and very expensive fuel. All new buildings in Germany are required to meet the stringent PassivHaus standards of air-tightness (and must have properly sized HRV) but it should have been mentioned in the video. Here in Canada, open fuel burning in homes is being phased out so new gas stoves will no longer have an open flame but a sealed combustion chamber and an outside air source and a chimney. The biggest problem is the humidity though... without air flow, the humidity rises (even from human breath) and so fuel exhaust needs to be vented to reduce the use of the ventilation system for dehumidification.