Just FYI - Hot water DOES help with Bypass flow through humidifier.

[tadowdaddy]

I recently installed a GeneralAire 1099 LH in a 3000 sq ft home, new construction. I was having a problem getting the RH above 30% when using cold water. Hooked up to the hot, RH is now comfortably at 40%. Lots of problems due to an overpowered furnace, but hot water did the trick. I browsed the forum and saw a lot of people asking how much hot helps, and in my case, it was 10% increase just one day after making the switch.

[martyinlincoln]

Yes it does help. It also makes your water heater turn on multiple times a day instead of a couple so expect to pay a little extra.

[tadowdaddy]

The comfort of proper humidity as opposed to what it was before we put in the humidifier (20-25%) is well worth the cost IMO.

[mark beiser]

That's why humidifier manufacturers recommend supplying them with hot water in the installation instructions. Typically no more than 140º though.

[beenthere]

Yes it does help. It also makes your water heater turn on multiple times a day instead of a couple so expect to pay a little extra.

The increase in humidity enables the home owner to keep their stat set a bit lower. So it saves on the heating bill.