CG>Last night, and tonight, the pan needed only about one litre of
CG>water. It seems to me that the walls have now achieved their load
CG>of water and that they act as a reservoir, supplying moisture for
CG>the air I breathe as I toss and turn restlessly at night,
CG>pondering the significance of this business.
CG>This is not critical, I'm just fascinated that the intake dropped
CG>so abruptly and by so much.
  Ever look outside, Chris? We've just had almost a week of rain and/or
  mild weather, and my hygrometer shows my house moisture levels have
  climbed above 55%. (My barometer bones gave due notice of rising
  moisture levels.) My house plants suddenly became less thirsty as
  well.
  However, I think you'll notice, as the weather heads back into our
  much-heralded but rarely present winter, that your humidifier's
  thirst will increase. BTW, do you live in a high-rise? Where is the
  heat coming from, and can you adjust it?
  Most furnaces in our climate have builtin humidifiers; around here,
  lime in the water often clogs them solid within a couple of years.
  When that happened to us, after a couple of futile attempts to keep
  it clean, we simply forgot about it. Our main source of winter
  humidity now are showers, cooking, laundry (washing machine is in
  kitchen) and...plants. Once in a while, when we use the woodstove,
  which has a very drying effect, hubby will turn the vent from the
  dryer inside (but that really bugs me!) But mostly my plants use more
  water, both in pots and drainage evaporative trays.
  But we do use a dehumidifier in warm months, since our outdoors summer
  humidity levels are notorious. :-)
                      ...Sandra...
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