![]() ![]() *Please see Aqua-Hot Owner’s and Service Manuals for instructions concerning all of the above items. Mixing these two colors together may cause discoloration of theĭiscoloration of the Aqua-Hot’s antifreeze Solution does not indicate a malfunction of the Aqua-Hot system or the antifreeze solution. ![]() (green in color) or Camco brand (pink in color) boiler antifreeze. Motorhome manufacturers generally fill the Aqua-Hot with Century brand Mixing Century Brand (Green) and Camco Brand (Pink) Boiler Antifreeze Aqua-Hot recommends using onlyĭeionized or distilled water. Level propylene glycol in the Aqua-Hot’s antifreeze solution*.Īdding Tap or Well Water to the Aqua-Hot systemĪdding tap or well water to your Aqua-Hot system may cause theĪntifreeze solution to discolor. Please see the Aqua-Hot’s Owner’s manual for instructions on testing the Propylene glycol may cause the antifreeze solution to discolor. Operating the Aqua-Hot with less than 35% The Aqua-Hot’s antifreeze solution should contain between 35% and 50% Low Levels of propylene glycol in the antifreeze and water solution Air in the Aqua-hot boiler tank mayĬause the antifreeze solution to discolor. If the Overflow bottle is empty, it must be refilled, and It is important to keep the overflow bottle filled to the proper The following conditions may cause the antifreeze solution in your aqua-hot to change color:Įxposure of the antifreeze solution in the Aqua-Hot boiler tank to air This discoloration does not indicate a malfunction of the Aqua-Hot system or the antifreeze solution. DO NOT exceed 50%ĭiscoloration of propylene glycol antifreeze solution may occurĭuring normal operation of the Aqua-Hot system. In lower water and interior cabin temperature levels. Heating zone lines and may coat the system's interior surfaces resulting The heat transfer capability, causes sticking check valves in the Propylene glycol boiler antifreeze to water. The Aqua-Hot antifreeze solution should fall between 35% and 50% Water will evaporate from the boiler antifreeze mixture over time,Ĭoncentrating the antifreeze mixture and changing the ratio in the Indication of the Aqua-Hot antifreeze solution level.Ĭheck the percentage of propylene glycol antifreeze solution in yourĪqua-Hot system with a calibrated coolant/antifreeze refractometer. See if the antifreeze solution is at the HOT mark. When it is warmĪnd the coach is level, visually check the Aqua-Hot expansion bottle to Run your Aqua-Hot system to operating temperature. *125D and 125G systems use a mixture of 50/50 Ethylene Glycol antifreeze and distilled water.Īntifreeze Fill levels are visually checked at theĮxpansion bottle when the Aqua-Hot system is warm and level the proper Ethylene glycol can be used in these pre-2002 systems, as well as GRAS-labeled propylene glycol boiler antifreeze. Ethylene glycol was used in pre-2002 Aqua-Hot systems with the exterior domestic hot water loop design. DO NOT use Ethylene Glycol or Propylene Glycol automotive antifreeze in these Aqua-Hot systems.Įthylene Glycol Antifreeze Ethylene glycol antifreeze is toxic, does not have the GRAS label and is not suitable for an Aqua-Hot system manufactured after 2002. *except for Aqua Hot 125D and 125G systems.Īll Aqua-Hot Systems manufactured after 2002 must use Propylene Glycol antifreeze, including Hydro-Hot™, Aqua-Hot 250P™, Aqua-Hot 250D™, Aqua-Hot 375D™, Aqua-Hot 375LP™, Aqua-Hot 400D™, Aqua-Hot 400P™, Aqua-Hot 450D™, Aqua-Hot 525D™, Aqua-Hot 600D™, and Aqua-Hot 675D™. Propylene Glycol Boiler Antifreeze In 2002, Aqua-Hot changed the system design and in 2003 systems started using Propylene Glycol-based boiler antifreeze rated Generally Regarded AS Safe (GRAS). Anything else is likely to be harmful if swallowed.įreeze Point is the temperature ice crystals will start to form in the antifreeze solution.īurst Point is the temperature where damage will occur to the coach. GRAS is the term to look for on antifreeze products. This is the Federal Drug Administration term for Generally Regarded As Safe. Aqua-Hot heating systems use boiler-designated antifreeze that is rated GRAS - Generally Regarded As Safe. These terms are typically used interchangeably. If purchasing elsewhere, Camco has pink RV Plumbing and RV Freeze Ban antifreeze in addition to their pink boiler antifreeze be sure to use the boiler antifreeze in your Aqua-Hot system. Aqua-Hot offers Century Boiler Antifreeze in both green and pink, in 1 gallon and 32 oz options. Boiler anti-freeze is intended for use in boiler systems and has a different chemical composition than antifreeze intended for RVs, automobiles and trucks. ![]()
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