Humidifiers and Dehumidifiers - Truesteam and hot water line

I've looked around, but could not find an answer to my question. I am installing my HM512 w/ VisionPRO IAQ and was wondering if it is ok to use a hot water line even though it is not required. My reasoning is that I have a gas water heater and this would distribute the cost between the two utilities and reduce the amount of electricity used by the unit.

I know that using hot water means I cannot use the plastic supply line, flow control, and water filter provided with the unit.

The only follow on question, assuming hot water hook-up is ok, is will the fact that the water in the tank will not be cooled prior to flushing the system be an issue? If so, please explain and share any ideas on how to address that?

In addition, the wiring diagram recommend an AFS, but I do not have one. How important is this? Can you recommend an AFS?

I don't see anything wrong with using hot water on it.. I would take less electricity to run the steamer to make hot water for the steam.

AFS (Air flow switch) is not needed.. When you wire up the TrueSTEAM to the EIM, just hook up HUM to HUM.

The IAQ will not allow the steamer to come on if there was something going on with the t-stat.

After consulting Honeywell the issue with the hot water is that it could melt the PVC pipe that the system drains into or in my case the plastic on my sump-pump. Since I'm not looking to replace my sump-pump I think I'll just go with cold water. :( Oh well, seemed like a good idea...

If anyone else considers doing this and melting is not an issue there is one other thing to keep in mind. If you don't have a water filter before the water heater, I'd recommend installing one there instead of in the hot water line...changing a filter on a hot water line can be extremely dangerous.