Blowing out water lines in Class A

JaxDad wrote:

et2 wrote:
Yes there are, anyone with a aqua hot and I assume other similar systems require antifreeze added to the water lines. They can't just be blown out with air. Any water left in the system could burst the copper coils. States right in the manual.

I’m at a complete loss to understand why the coils in the AquaHot system would be any different than the rest of the water system

Can you explain why you think they are?

It's not up to me to decide. I know my systems and have read the manual. Like you said you know what your manufactures procedure is, so do I.

Here's the exact print from my owners manual

Winterize the Aqua-Hot
The Aqua-Hot can remain on during the winter months. If the motorhome is to be winterized and stored over the winter with the Aqua-Hot turned off, the Aqua- Hot domestic water loop must be winterized with FDA approved RV antifreeze to prevent freeze

FDA approved RV antifreeze must be pumped through the Aqua- Hot until the solution appears at the hot water side of a faucet. The on-board water pump can be used (see illustration) to purge water from the Aqua-Hot domestic water loop.
Refer to the Aqua-Hot owner’s manual for complete winterizing instructions. If the system is operating from AC electric and a power outage occurs, extensive damage to the Aqua-Hot may occur.


From aqua hot manual

Not winterizing the Aqua-Hot when freezing temperatures are present will result in serious damage to the Aqua-Hot’s Domestic Water Heating System. Also, be sure to use an FDA approved, “GRAS” rated antifreeze for An FDA approved “GRAS” rated winterization antifreeze must be used.

YOU CANNOT BLOW DOMESTIC WATER COIL OUT WITH AIR TO WINTERIZE AQUA-HOT.


I hope that helps you. I have ny thoughts why, but I'm not the expert. As I simply stated before, know your own rig and what's required.