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Old 01-23-2014, 09:52 PM   #1
Join Date: May 2013
Location: Brandon, Florida
Posts: 93
Hydro Hot Problem

I have a few questions about the Hydro Hot in our newly purchased 2005 Country Coach Intrique. While the RV was at the shop for a few weeks having a “six pack” airbag replaced, the house batteries ran down. Once I took procession of the coach, we managed to bring the strength up enough for the house batteries to start the generator.

We then noticed that the panel for the Hydro Hot had the low battery level light on. We reset the panel, and then the “Low Tank Level” light came on. Looking at the plastic expansion tanks, the level of the fluid is between the “Cold” and “Hot” lines on the sides of the tanks which I would assume would be the correct amount.

I would like to know more about this system so I can determine if I should add some more fluid or is it a faulty switch caused by the lack of power during the time that the battery was low.

Finally, If I’m going to have to add some antifreeze and water. Which antifreeze should I mix with the distilled water. I found a few different varieties described on various treads ranging from Camco Boiler Antifreeze (propylene glycol), and Prestone (ethylene glycol coolant) being used.

The unit is an Hydro Hot, Model #HHE-500-09M-12VDC

I'll be trying to muddle my way though this problem later this weekend.


2005 Country Coach
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Old 01-24-2014, 07:46 AM   #2
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Newmar Owners Club
Join Date: Jun 2013
Location: MidWest
Posts: 1,061
We have the Oasis System, but maybe this will help...
Ken & Anita 2011 Newmar Essex,4522,Cummins 500 ISM,2013 CRV,RVI2 Brake with TPMS **Our Travel WebSite**
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Old 01-24-2014, 08:40 AM   #3
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Monaco Owners Club
Join Date: Sep 2010
Location: Golden, Colorado
Posts: 822
You should join the RV Hydronic Heater Forum run by Roger Berke. He is an expert on them. There is a section on Hydro Hot and you can ask any questions. He is very helpful and answers questions quickly...... He rebuilt my Wabasto and it runs like new now...

RV Hydronic Heater Forum

Good Luck
2004 Monaco Signature with a Detroit 60, Vorad Radar, Samsung Fridge, Induction cook top, 2020 GMC Denali
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Old 01-24-2014, 10:04 AM   #4
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Fleetwood Owners Club
American Coach Owners Club
Join Date: Mar 2011
Posts: 6,146
Our Aqua Hot uses propylene glycol. I found it at a marine store.
2014 American Eagle 45T
DD 13, 500 HP
Pulling a Honda CRV
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