What they say about the spray type I generally agree with. Some of
what they say about the bypass type is true. However, some of what
they list as a negative, eg float valves, are not used in good units,
like Aprilaire. With fan powered units, they make claims that are
absurd and draws their credibility into question:
"The motor that powers the filter is one of the most inefficient motors
on the market. The little motor can use as much or more electricity
that the blower moving the air throughout the home."
Does anyone believe that a little 4 inch fan can use as much power as
the main furnace blower?
The electric element type they talk about I have never seen and didn't
even know they exist.
I've had an Aprilaire 760 for about 6 years now and am very happy with
it. There is no question the house feels much more comfortable in the
winter. This model is the fan powered type that mounts on the hot air
plenum. It has no float, no rotating media. The water enters via a
solenoid valve and trickles down over a media element, which a small
fan blows air through You just replace this element when needed, which
takes 5 mins. I typically go 2 seasons with one element. They cost
about $8. The unit also has an outside temp sensor, which will back
off the humidity as the outside temp drops.
Bottom line, buy a quality unit like the Aprilaire 760 and maintain it
by servicing it at the end of each season and you can get the benefits