"Heat Recovery Ventilator" - it's a device that works in conjunction with a furnace to deal with excessive humidity (in the case that this is a problem - luckily not usually a problem for people with one tank with water volume less than 120 gallons or so).
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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