We heat one of our buildings with a 4 ton water-to-air heat
pump, and it has worked very well for the past seven years.
In the winter, we pipe steam into the duct system to
humidify the building.
The heat pump has a small drain that empties into a pump
that (during the AC season) moves the condensate from the
unit into a slop sink in my shop.
Yesterday, in the cold of our New Hampshire winter, I was
surprised to hear the sink gurgle as about a pint of water
I watched as it came out of the heat pump drain tube...
But, where would such water be coming from during heating
season? It would seem that the would be no condensate, but
what else would it be?
Many thanks for any thoughts,
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