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Old 03-02-2011, 07:28 PM   #1
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Aqua hot question

My aqua hot looses a little coolant fluid when it's running -- something like about a pint in a week ???

The Tech that is working on it says that is normal ??? That all aqua hots loose a little fluid when they run ???

Is it normal ???

It seems to me that it should not use fluid?? unless something is leaking ???

Thanks for your thoughts on this

Gene
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Old 03-02-2011, 07:54 PM   #2
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Check for a leak...I had a clamp that had a very small drip. I'm no expert, but saying it should leak (it's a closed system) is like saying your car radiator should leak.
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Old 03-02-2011, 07:56 PM   #3
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Check for a leak...I had a clamp that had a very small drip. I'm no expert, but saying it should leak (it's a closed system) is like saying your car radiator should leak.
That's what I was thinking!
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Old 03-02-2011, 09:06 PM   #4
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my coach is almost 5 yrs old and I had to add some fluid 2 yrs ago...a very small amount, and none since...
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Old 03-02-2011, 10:33 PM   #5
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I wouldn't call that kind of loss normal. Or for that matter, any loss at all. It is a fully closed system and there is no "normal" way for fluid to be lost.
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Old 03-03-2011, 01:12 PM   #6
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As CAT320 mentioned, you should look for a leak somewhere in the system. I would also suggest that you find a different tech for your AquaHot needs. Your current one may be excellent at many RV repairs, but he really seems lacking in AquaHot experience. They should not leak in normal operation.

You don't mention what year your Country Coach is, but it is not uncommon for these units to develop some small leaks over the years. Some of the older units have plastic parts that are not holding up as well as AquaHot thought they would. I would start from the surge tank connection and make sure everything is OK around the AquaHot unit before looking at the registers.
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Old 03-03-2011, 02:12 PM   #7
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I would check the fittings on the heat exchangers as well at where the PEX lines connect to the unit just above the circulation pumps by the check valves. These are common places for leaks to develop from being jarred around.

One other scenario depending on the year of your Aqua-Hot unit. If it is an 02 or earlier version then it is possible to have a leak at the top of the boiler tank just under the radiator cap that will cause glycol loss.

The newer tanks/units have the domestic line routed inside of the boiler tank. When these have issues generally it is the domestic line that puts water into the boiler tank causing the surge tank to overflow.

The leak on the the radiator cap to tank connection is not a bad leak to fix once the entire assembly has been removed. It is time consuming to remove the unit on most coaches though. Mike.
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Old 03-03-2011, 03:09 PM   #8
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What is the model number of your Aqua-Hot? With that I can give you some spots to check for leaks.

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Old 03-03-2011, 04:58 PM   #9
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hi egb, as stated aqua hot should not leak. mine is close to 5 years old and nothing but some maintenance. also this doesn't really apply , but I have had to replace the circuit board due to one of the circulating pumps not coming on. it's a great system! good luck
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Old 03-03-2011, 06:22 PM   #10
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What is the model number of your Aqua-Hot? With that I can give you some spots to check for leaks.

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Old 03-07-2011, 01:00 PM   #11
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True, it's a sealed system and should not use any fluid unless a visible leak is found. However, if any service work was done to the plumbing it's possible that air may be in the system. When our Bus was new it took close to a year until the air that was trapped in the system fully worked it's way out. I had to add a little every now and then but after one year it held without dropping. Note that we are not fulltimers so for those who use their system more this should settle out fast.
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Old 03-09-2011, 09:34 AM   #12
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I think I found my problem ???

My Aqua-Hot is a model 525-D

I am thinking that my problem has been air in the system. We have been living in this motor home for about 10 days now and I have not lost any coolant. So I expect that what was going on is that air was working it's way out of the system?? So for now at least it seems to be fine.

Thanks for all the suggestions, they are much appriciated.

Gene
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Old 03-09-2011, 09:41 AM   #13
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RE: Aqua-Hot (Model 525D)

Monitor the coolant level closely over the next few weeks to determine if you are still loosing coolant. Your model of Aqua-Hot does not use a radiator cap. The overflow bottle becomes an extension of the boiler tank.

Your model of Aqua-Hot uses the Beckett burner and not the more common Webasto.

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Old 03-09-2011, 10:14 AM   #14
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Beckett burner??

Roger
Thanks for the help

I will watch the level and if it dose go down, I'll get back to you

Is there anything I should know about the Beckett burner???

Gene
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