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Old 01-23-2017, 11:05 AM   #57
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Everyone should use what makes sense to them. I in no way am trying to talk anyone into using any specific product. Just putting what info I know out there to try and contribute to the overall community understanding so that people can make intelligent decisions. And to try and make some sense of what has happened on the Aquahot failures noted todate.

I agree with Richard's comment that it takes more than just proplene glycol and water to make an acceptable coolant. That is why it is important to not blame only the PG specifically for the problem.

But, to make an acceptable coolant I feel it needs the corrosion inhibitors so that is why the LoTox is mentioned. LoTox is probably overkill for this application but it is available as an option if you understand what is going on and how the coolant interacts with the system.

The best bet I have is that Century made a bad batch of coolant by either using contaminated or inferior material and or tap water with a lot of mineral content or mixing it with some other product in their system they use for bottling....???? All just guesses or possible examples.

Nice thing about buying pure food grade PG or LoTox and mixing it yourself with distilled water is that you control the ingredients and the concentrations yourself eliminating their quality control to some extent. It is also less expensive to do this. Aquahot would never officially condone it because of liability issues.

Historically there are numerous examples of coolant vendors making major mistakes with coolants. Straight coolant has been delivered under the guise of 50/50 premix. Coolant has been delivered without the correct corrosion inhibitors and/or the completely wrong corrosion inhibitor or the wrong concentration of corrosion inhibitors. The wrong products were put into the wrong containers and labeled incorrectly because of mistakes at the bottling facilities. Chinese products have killed people because the Chinese put ethylene glycol in toothpaste and mouth wash instead of propylene glycol.....read the labels, PG is a common ingredient. PG is primarily used in the food industry to retain moisture and add viscosity to many products and packaged baked goods. In these applications PG is totally GRAS compliant where small amounts of ethylene glycol are extremely toxic.


It is very easy to envision Camco or Century making a bad batch of coolant based on the precedents I have personally witnessed or read about.

Finally, the subject of coolants for any given application is very complicated. There is no single correct answer for everything or everybody. Every specific application requires intense scrutiny for the final answer and stating it is very risky due to unknown variables of each operator. Even in the case of a coach it would matter as to what year, model of AquaHot and use schedule that operator requires. If the domestic water loop is outside of the coolant container the Ethylene Glycol would be perfectly acceptable. In the case of the older, presurized systems the concentration would be much less critical than without pressure. So....to each his own.

I've about run out of patience on the AquaHot for the moment
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Old 01-23-2017, 12:35 PM   #58
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Quote:
Originally Posted by brobox View Post
Page 116 of the owners manual. In addition on an Entegra you have to power the boost pump located behind a carpeted panel in the basement compartment P/S forward of the rear wheel. This can be done with a jump wire from the 12v plug in the next compartment from the basement freezer plug, or a 12v transformer of any type. The floor holds about 4 gallons of boiler fluid. http://www.aquahot.com/aquahot.com/m...nual_REV_E.pdf
Thanks Chuck, would have forgotten about heated floor loop. I assume you would want to flush the entire system with water before adding new "fluid of your choice".
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Old 01-23-2017, 02:42 PM   #59
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Thanks Chuck, would have forgotten about heated floor loop. I assume you would want to flush the entire system with water before adding new "fluid of your choice".
Yes, almost half is in the floor loop. 6 gallons for the AH and 4 gallons for the floor loop.

We flushed with distilled water as I had so much sludge to clean out. We used a 5 gallon bucket at the suction end, and a 5 gallon bucket at the hose removed from the over flow tank end. We used a section of new hose with a hose coupling and flushed into a 5 gallon bucket sitting on the floor. When finished we connected the new hose and threw the old hose from the tank away as it was brittle.

If you are just changing fluid, you can flush and fill with the new fluid. You will be able to see the color change in the clear hose.
We used 34 gallons of distilled water before my system was clean. You can see how much sludge was in the first couple of buckets. The front bucket is the old and new hose.
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Old 01-23-2017, 10:25 PM   #60
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We just had out Aquahot 450 D serviced and now it is shutting down the moment it fires up. Black stinky smoke everywhere. Going back to Buffalo RV on Wednesday ! May be the pump.. Here is the fluid pic, Click image for larger version

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