Product review (5 stars): Great for downdraft furance.
The only solution I could find short of steam.

I had no space left to install a regular bypass humidifier and the was the most cost effective humidifier to run. Its hard to get the humidity above 30% and it doesn't work with fan blowing cold air by it.

I also installed a regular 1/4 sharkbite stop valve for the waterline. Seeing that piercing valves never shut off all the way.