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Then & Now from Environmental Building News
May 1, 2006
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....
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