for a little more money over the bypass unit y'all have a great unit..
I have a engineering Mind, and if I was to design a humidifier, this would be it.. I took down my bypass unit and installed the 700 with full automatic humidistat, both pieces of equipment puts the bypass unit to shame, you set it and forget it if it's hooked up to an outdoor sensor.
My son bought the 700m with the manual humidistat and now he has to micromanage it.. he is now looking for a Aprilaire 60 humidistat with outdoor temperature sensor and I will install it for him..
Install the 700 on the supply duct and use the hot water line