I wired up 1 of these http://www.carelusa.com/homesteam.htm for a friend.
It's a home steam generator, comes with a flow switch to sense the HVAC fan,
diagnostics, dumps when water gets bad.
April Air has a unit that monitors outside temperature and keeps
humidity at the optimal point you set, Set it once to when you get
condensation, back it off and thats it, its set. Steam units waist
electricity and can be bad for duct work, - rusting.
I may have missed something, but the HW doesn't adjust automatically. I
does get the humidity in the house correctly.
My AA 550 runs all the time to try to get the house to 50% RH, and that is
using hot water across the panel.
Actually, it doesn't matter what type of heating is used. Air that is
warmed from below freezing temperatures up to room temperature will
always dry out.
If it's -20C outside (around zero degrees Fahrenheit for you yanks), and
80% relative humidity, that air, when warmed to +20C (room temperature),
will drop to around 15-20% relative humidity. Humidity measurements are
always relative to the temperature.
When people say that their furnace "dries the air out", it's not the fact
that it's a forced-air system that is trying out the air. It's simply
the fact that the temperature of the air is being raised. Systems with
hot-water heating will also end up with dry air if humidity isn't added
via a humidifier.
George Wenzel, B.A. (Criminology)
Honeywell, or Aprilaire.
The ones we sell are Aprilaire...York rebadges the Aprilaire models for us
if we are doing a high end system and want the fancy labels to match...but
they work and when sized to the system, with a humidistat, work well.
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