Quick HydoHot
Question
A Premier RV of Oregon customer
recently asked, “Do I need to use a specific coolant to top off my Hydro-Hot
unit?”
Simply put, YES! Older units use engine coolant-type antifreeze while the newer units use boiler coolant. Do not add antifreeze to a newer style Hydro-Hot unit! This requirement is due to a change in the internal construction of the heat exchanger of the unit. Newer units require a coolant that is rated as “Generally Recognized as Safe” (GRAS) by the FDA. This rating is most commonly found on boiler coolants. Boiler coolant is generally available at heating or plumbing contractor supply houses - as well as some hardware stores. It’s easy to identify which generation of Hydro-Hot you have by taking a look at the pressure cap on top of the unit. Older units have a large 4” diameter cap, while the newer units have a smaller, standard automobile size radiator cap.
--Kevin
Kiscoan, Premier RV of Oregon, www.PremierRVServices.com
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