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RussWhite · 11-06-2011, 02:47 PM

Chester,

I think you will find the original poster has an AquaHot model 431 vintage. Those were designed for ethylene glycol.

Here is a quotation from Roger Berke's great AquaHot forum:

"Your Aqua-Hot model 431 uses standard ethylene glycol coolant (Prestone or equal).

Any automotive supply or big box store sells ethylene glycol coolant that "is compatible with all coolants". You do not need to use the propylene glycol (Camco) coolant in your Aqua-Hot"

At some point the design changed and those new units are clearly tagged as requiring propylene glycol.

Roger runs two forums. One is free and the other is premium. You get two years on the premium forum just for purcahsing any part from him. If you just want to join the premium I thinks it's only five dollars. Here is a link to the free one:

http://forum.rvhydronicheaterrepair.com/forum.php

Hope this helps. Russ

11-06-2011, 02:47 PM	#10
RussWhite Senior Member Join Date: Jan 2010 Posts: 346	Chester, I think you will find the original poster has an AquaHot model 431 vintage. Those were designed for ethylene glycol. Here is a quotation from Roger Berke's great AquaHot forum: "Your Aqua-Hot model 431 uses standard ethylene glycol coolant (Prestone or equal). Any automotive supply or big box store sells ethylene glycol coolant that "is compatible with all coolants". You do not need to use the propylene glycol (Camco) coolant in your Aqua-Hot" At some point the design changed and those new units are clearly tagged as requiring propylene glycol. Roger runs two forums. One is free and the other is premium. You get two years on the premium forum just for purcahsing any part from him. If you just want to join the premium I thinks it's only five dollars. Here is a link to the free one: http://forum.rvhydronicheaterrepair.com/forum.php Hope this helps. Russ