The 1980s brought forth the first condensing gas-fired appliances we dealt with: 92% efficiency furnaces. Those first-generation condensing furnaces had more than their share of glitches, which gave us a few more gray hairs while customers chewed us a new behind on more than a few occasions! Having not dealt with combustion=produced condensate previously, we either piped that to a nearby floor drain or to the outdoors using a condensate pump. That first winter, we learned — the hard ...

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