Product review (1 stars): Dont do it!!!
I recently hired a Contractor to install a humidifier on my furnace.  Given the configuration of my furnace, the humidifier had to go on the cold inlet side of the furnace.  My Contractor suggested I have him install this model after doing some research and reading that this product can be installed in this configuration.  I told him to proceed and he procured the unit from our local Home Depot store and installed the unit relatively easily, but he could not get water to flow to the filter media.  After checking and rechecking every fitting, wire connection, and running through all of your trouble shooting tips, he was left without a cause as to why it would not operate.  By all appearances the solenoid valve was not working.

He called and consulted with one of Honeywell's service representatives on the phone and after a lengthy phone call, and again walking through all the trouble shooting steps, the service rep concluded that the solenoid valve must be faulty.  The rep directed him to remove the unit, return it, and reinstall a different one as the remedy.  My Contractor did this, and the new unit is suffering from the same malfunction.  Again my Contractor spent several hours trying to trouble shoot the problem, verified that all connections have been property made.  My Contractor again consulted a Honeywell  rep who again concluded that a faulty solenoid must be the cause for the problem.  I have now spent $400 in service fees to have the unit installed, uninstalled, and reinstalled, along with several hours of trouble shooting, and it is still inoperable.

I did a bit of research on the internet and have come to learn that I am not the only one to experience a faulty solenoid.  I filed a request for assistance with Honeywell explaining that I can not continue to fund returning and re-returning this product to the store in hopes that I get one that actually works.  11 days later, I received this utterly worthless response:

"Please be advised that the limited retail product warranty that accompanies your HE240 Retail Humidifier is limited to receiving a warranty exchange or refund on a defective unit directly through the retailer where the product was purchased upon return of the unit in question together with proof of purchase.

However, the decision to enlist the services of a professional contractor for assistance before, during, or after the install of the retail product shall be done at the sole discretion of the retail consumer irrespective of any potential product defect situation.

Paul Arntzen
Honeywell Customer Care Lead"

Honeywell clearly has no confidence in their product and offers their customers no remedy for having purchased one (in my case, two) of their defective products.  I strongly urge any potential buyers to pursue another, more reliable brand.