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Old 11-28-2011, 08:00 PM   #1
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Hydro Hot Boiler Antifreeze

I have never had an Hydro Hot system until my current coach. The one I have is Model HHE-200-09E. The coach is a 2007 CC Intrigue. When cold the overflow tank is about 3 inches below the cold mark and when hot it does not move very far and is still well below the cold mark. I talked with Hydro Hot and they really were not much help. Does anyone know, or willing to take a guess, at how much antifreeze it will take to bring it up to the full mark when hot. They told me that the entire system takes 6 gallons of 50/50 mix to fill. I seems to me that adding antifreeze when it's cold, up to the cold mark, may not be enough. The Radiator cap is on top of the unit and almost impossible to get to let alone check the level. For anyone who has tried to find the special boiler type antifreeze, after a half day searching I found it on Amazon for $8.00 per quart. The company was recommended by Hydro Hot. Their name is Camco and there is just none available locally. As a side note has anyone had any luck finding a shop manual for this unit? I have the owners and the parts manual, and I have been everywhere trying to find shop manual with no luck

Thanks in advance

Dick
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Old 11-28-2011, 08:13 PM   #2
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You need the Camco pink boiler anti-freeze. It is sold at a lot of RV stores and a at Camping World. If the level is way down in the Aqua Hot then it will not work. I would not open that radiator cap because the anti-freeze will come out. Just top off the overflow tank to the cold mark and you should be OK.
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Old 11-28-2011, 08:22 PM   #3
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All Aqua-Hot and Archived Hydro-Hot manuals are here: Aqua-Hot Heating Systems Inc.

Aqua-Hot was formally Hydro-Hot.

You have to dig through the information but there is a section about filling the system.

Dave
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Old 11-28-2011, 08:40 PM   #4
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Dick

The Camco -100 Boiler Coolant available at Amazon is the correct coolant. The product that they have available is a 'concentrate' and should be mixed with 2 parts distilled water (33% Camco -100 coolant concentrate / 66% distilled water). This one quart bottle will make about 3/4 gallon of ready to use coolant.

Turn off your Hydro-Hot and allow it to cool for 1 hour. Remove radiator cap and fill to top of neck. Replace cap, bring unit to operating temperature, then fill overflow bottle to "Hot" level.

You will find manual for your Hydro-Hot on the Aqua-Hot website, here: https://www.aquahotparts.com/eSource/ecom/eSource/default/ArchievedManuals.aspx
If you want shop manual, download the one for the HHE-500-07E.

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Old 11-29-2011, 09:32 AM   #5
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Thanks everyone for the info. The shop manual for the HHE 500 appears to be the same unit. I don't know why Vehicle System's did not let me know. I ended up getting the Boiler Antifreeze thru Amazon. The radiator cap is on top of the unit with very little room. I hope I can get some fluid in there.

Rodger...the link to the Hydronic heating forum is very informative


Thanks
Dick
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Old 11-29-2011, 09:42 AM   #6
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Dick

To get the radiator cap off your Aqua-Hot turn and push down at the same time. Real tough sometimes. NO TOOLS - they may damage the brass filler neck.

If you transfer coolant to 1 liter water bottle it makes it (a little) easier to pour coolant into the filler neck.

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Old 11-29-2011, 09:57 AM   #7
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I used my wifes Turkey baster to fill it.
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Old 11-29-2011, 02:42 PM   #8
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Quote:
Originally Posted by Perry White
I used my wifes Turkey baster to fill it.
Hopefully after Thanksgiving!
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Old 11-29-2011, 07:57 PM   #9
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What you need is Propylene Glycol it can be found at most marine stores, West Marine has it on line.
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