Don't know about those specific brands, but apparently there are dryers
that use a heat exchanger for the air. Incoming cool air is used to
cool and condense the moisture out of the exhaust air. Yes, there must
be a condensate drain somewhere.
I don't know of any ventless dryers as stand alone units but they
probably exist. I do know that the above companies plus Equator, Thor
and Spendide make single tub front loader combo washer/dryer units
that are unvented.
The tub washes the clothes and then changes function to a dryer.
The dryer function has a condensor that is cooled by incoming cold
water. A fan circulates heat from the internal electric heater through
the tub and out into the condensor. Cooling the condensor with
incoming cold water (only about 2 gallons are used per drying cycle)
increases the dyers efficiency. A drain hose must be used and no
moisture or lint is let into the air. It's all flushed down the drain.
I have an Equator combo washer/dryer unit. They are all extremely
efficient,very slow (since the dryer operates on 120V current versus
240V) and VERY complex units. Reliability isn't as good as
conventional systems but they wash/dry well, use little energy, only
about 9 gallons of water per wash/dry cycle and miniscule amounts of
low sudsing detergent.
Thanks very much Doug for the information. It appears that the ventless
dryers also use the same method, and they make sense for the special
situations where outside walls or roof venting is not an option. I
appreciate your reply.
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