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Author Topic: Notes from an Aqua Hot seminar at a Motorhome Rally  (Read 259 times)


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Notes from an Aqua Hot seminar at a Motorhome Rally
« on: February 21, 2018, 11:09:51 PM »
The Aqua Hot heating system can be a confusing system in your RV if you haven't had one before (like me). The following are notes on the Aqua Hot operation and functions from Mark Davis, Regional Sales Director, Aqua Hot Heating Systems Inc. 

I attended a Tiffin Rally at the Pima County Fair Grounds, in Tuscon, AZ in February 2018. One of the Seminar presenters was Mark Davis. The following tips and facts were provided by Mark at the seminar. 

1) The electrical heating element in the Aqua Hot pulls 13 amps when heating the boiler fluid.  In standby mode the draw drops to 1-2 amps.

2) The Diesel burner may use up to 3-4 gallons of diesel a day, in worst case scenario settings. IE Very cold outside, all heating zones functioning, and all windows open. The use drops from there.
3) The boiler fluid in the holding tank  must be at least 170 to 190 degrees for the Aqua Hot to provide either hot water or heat to the coach.

4) The Aqua Hot output temperature is factory set to 120 degrees. A mixing valve at the back of the tank will inject cold water into the stream to control the temperature of the hot water.

5) The Aqua Hot diesel burner should be run once a month for 5 minutes to keep the check valves clean and  operating normally. Even in the summer months.

6) The boiler fluid used in the Aqua Hot is Propylene Glycol. It is a form of sugar water. This is used in case it were to leak into the water system of the coach, it would be non-toxic.

7) Camco and Century are two companies that make Propylene Glycol for Aqua Hot. Camco is pink, Century is green. They are exactly the same other than the color, and either can be used in the boiler, and  can be mixed. The only important factor is the concentration of Propylene Glycol to Distilled water. The proper concentration is 35% to 40% Propylene Glycol to water.

8) In a low fluid situation with no Propylene Glycol available, pure distilled water may be added to the boiler tank so your system will function until you can obtain the correct fluid. The system will not function without a minimum amount of fluid in the holding tank.
9) The concentration of Propylene Glycol in the boiler should be tested with a Refractometer during the annual service. Adjust as necessary.

10) Shower valves with a higher delivery than 1.5 gallons per minute (GPM) may deliver more water than the Aqua Hot can deliver.
11) The mixing valve knob on the back of the Aqua Hot should be rotated annually during the service to keep the valve clear and functioning properly. Check the position of the knob prior to rotating so it can be returned to the same position when done. You may need a mirror to see the knob and it's position since it is on the back side of the unit.
12) In order for the Aqua Hot to keep your water bay from freezing, the Aqua Hot must be turned on either in the electric mode or diesel mode.  The thermostat in the water bay should be set at least at 40 degrees.
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