Yes. Brett Singer, a scientist with the Indoor Environmental Group at Berkeley Lab explains how pollutants get into the air from cooking and his group's research to clear the way for a rating system for range hoods.
Calcium carbonate builds up at the bottom of the water tank and reflects the heat back against the glass lining. This reduces the efficiency of the heater and shortens its life.
Two packages for high-performance homes. Vented and unvented roof insulation retrofits and exterior wall insulation details, along with rainscreen wall details for furring strips.