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Old 01-13-2022, 05:42 PM   #1
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Aqua Hot system

Looking at a new coach with an aqua hot system. Salesman typically donít know much I have found. Is this just instant hot water? Or does it also heat floors like residential? Pros and cons? Thanks
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Old 01-13-2022, 05:57 PM   #2
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Generally speaking, Aqua Hots are very good systems. They are hot water boilers. A tank with antifreeze is kept hot with electric, or diesel. That fluid is used to heat the coach and also heats the domestic hot water. In some units it can heat the engine block, and while the engine's running, the tank can be kept hot from the engine.
All newer floors are generally heated with electric coils under the floor.
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Old 01-13-2022, 06:36 PM   #3
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Aqua Hot system

Everything alank said. We have AH and itís a coach heater, hot water heater, engine block heater. We just drive from Illinois going through and overnighting in cold a couple nights. Weíre all electric, so with the electric floors and AH, we were toasty when stopped. While traveling, the floors are off so the back of the Coach got cold. Fired up the AH and it heated the Coach right up. Great system.
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Old 01-13-2022, 07:32 PM   #4
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Hi - Entegra heats their floors via the Aquahot. I'm not sure if any others do the same. The advantage is you can heat the floors off the excess engine heat while driving. The down side is when camping you are using your diesel to heat the floors rather than campground electric. Newmar uses Oasis which is a good choice.


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Old 01-13-2022, 07:38 PM   #5
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I will not have another MH without an AH...great system.
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Old 01-13-2022, 08:13 PM   #6
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We are looking at a Fleetwood LXE so I assume the floors are electric heat then. I didnít realize it was tied into the Cummins cooling system. I wonder how the long term durability will be.
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Old 01-13-2022, 08:27 PM   #7
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The other thing that hasn't been mentioned is the yearly maintenance on these systems, which is a couple of hundred dollars or more. The maintenance on my Suburban furnaces is $0.
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Old 01-13-2022, 09:20 PM   #8
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What is the yearly maintenance on an aqua hot system?
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Old 01-13-2022, 09:41 PM   #9
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What is the yearly maintenance on an aqua hot system?
To have a shop do it .. around $300..If You watch, ask questions and learn.. will cost around $50/$100 all in to DIY. the next time..

A note.. With either the AquaHot or the Oasis.. Inside the coach all you will hear is the fans turn on and off at the heat registers.. on our coach anyway.. We do not have the heated floors..
Also there are more BTU's in Diesel than Propane..so you use less gallons.. and draw from your big diesel tank ..We carry 200 gallons so can go a fairly long time when compared to a 40 or 50 gal propane tank.
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Old 01-14-2022, 04:49 AM   #10
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What is the yearly maintenance on an aqua hot system?
Basically, just changing the AH fuel filter and spray "nozzle". The nozzle is similar to the type used in oil-fired home heating systems.

I don't do mine yearly - my Coach doesn't get used enough (only 2 or 3x a year), but I do run the AH every month or so, just to exercise it (same with Generator).
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Old 01-14-2022, 06:53 AM   #11
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The other thing that hasn't been mentioned is the yearly maintenance on these systems, which is a couple of hundred dollars or more. The maintenance on my Suburban furnaces is $0.
True, however SWMBO really likes a long shower without having to do the "sidestep" when the hot water craps out. And I really really like the idea of the windows not "Sweating" in cold weather. Or having to find a propane filling station that I can get the RV into.
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Old 01-14-2022, 08:34 AM   #12
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...I don't do mine yearly - my Coach doesn't get used enough (only 2 or 3x a year), but I do run the AH every month or so, just to exercise it (same with Generator)...
Same here. I get mine done ($210) every 3/4 years....but exercise it to keep the nozzle clean. It is well worth it.
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Old 01-14-2022, 09:58 AM   #13
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Iím in the trucking industry and do much of my own maintenance and repair. It doesnít sound like you need specialized tools or training to service this system. I was more concerned with longevity, cracking heat exchangers or corrosion. Nobody mentioned that so Iíll assume that is not an issue. Thanks for your input. Nothing mentioned here worries me about owning an aqua hot.Thx
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Old 01-14-2022, 10:02 AM   #14
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The only tool I had to buy was a 16mm box wrench for the nozzle.

All of the manuals can be found online. They are fairly easy to work on. The parts can be pricey.
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