Unvented Gas Heaters Still Gaining Ground

Ten years ago, we expressed concern over the increase in sales of unvented gas heaters (see EBN Vol. 5, No. 3). At that time, sales totaled about 520,000 units per year. In the intervening decade, sales have risen to over one million units per year.
...

To read the complete article, please login below.

BuildingGreen.com