This switch activates a circulation pump on the Aqua-Hot unit to heat the engine coolant as it flows through a separate double walled copper coil loop inside the Aqua-Hot boiler tank. This acts as an additional engine block heater and aids in cold weather starting. Caution: Do not leave this switch on when driving.

This switch turns on the diesel burner which is the main heating source for providing heat to the interior, the domestic hot water and the engine aide system. This system will provide 50,000 to 65,000 BTUs (system dependent) for all your needs continuously. You should allow 10-20 minutes for the Aqua-Hot system to reach operating temperature.

Yes. The system is designed to operate and keep your coach warm while traveling.

The VAC electric heating element is wired directly into your motorhome's 120 VAC electrical system and is operational whenever VAC power is available. This switch turns on a 1650 watt 120 volt heating element in the Aqua-Hot tank that will adequately provide all your heating needs ONLY for low heating demand situations, such as when moderate ambient temperatures exist and/or when there is a low demand for domestic hot water. It is thermostatically controlled and you should allow 1-2 hours for the electric system to reach operating temperature. The electric heating element only provides 5600 BTUs, about 1/10 of the diesel burner, so don't expect the AC element to heat your coach and provide domestic hot water anywhere close to what the diesel burner will do.

Yes. Each system has its own control thermostats to maintain the coolant temperature. The 120 VAC heating element will only maintain the heat and will not respond to high demands of heat and hot water as fast as the diesel burner. When both switches are on and the water temperature gets low, the diesel burner will turn on to meet the higher demand of hot water. This is a good way to conserve diesel fuel.

It is normal for both the Aqua-Hot and Hydro-Hot to produce smoke for a few seconds whenever the diesel burner comes on. However. if either white or black smoke is present beyond 30 seconds. this could indicate a bad fuel nozzle, a partially plugged fuel filter, or a low voltage (VDC) situation. Please contact our Service Department at 1-800-685-4298 for additional assistance, or e-mail us directly by going to the ''Technical Support“ button on the left-hand side of the page on our website.

It is ideal to have your Aqua-Hot tuned up yearly. A tune-up should consist of a fuel nozzle and fuel filter replacement and a thorough cleaning of the combustion chamber, if necessary. This simple tune-up will keep your Aqua-Hot running smoothly throughout the year. It will also allow service personnel to inspect for wear and tear of other components.