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  1. J

    Automotive Antifreeze/Coolant for Boiler Heating System??

    I've found that the plumbing industry uses a Propylene Glycol base much the same material as required by Honda. This product is also sold for automtive use and it's reduced toxicity vis-a-vis Ethylene is the preferred feature. It is not anymore expensive than the Ethylene base but a lot cheaper...
  2. J

    Automotive Antifreeze/Coolant for Boiler Heating System??

    Thank you again. I'm not looking for confirmation for what I want to do. So far, unfortunately, the reasons you gave me does not tell me why not. One of the manufacturers I wrote to with the same inquiry has this to say: From: AMSOIL Technical Services Department Thanks for taking the...
  3. J

    Automotive Antifreeze/Coolant for Boiler Heating System??

    Thank you for your contribution. If it were not for check valves, the fluid control engineers could never design a system that works. Aside from check valves, the street water pressure runs approximately 75psi which is reduced to 18psi by a pressure reducing valve on the line to the boiler...
  4. J

    Automotive Antifreeze/Coolant for Boiler Heating System??

    Thanks for your response. The fresh water supply are both equipped with one way check valves to prevent back flow into the tap water system. Onse loaded, the radiant system is a closed system heated through a heat exchanger. Would the Boiler product not be just as toxic in terms of...
  5. J

    Automotive Antifreeze/Coolant for Boiler Heating System??

    In a gas fired boiler heating system (home), can I use automotive Antifreeze/Coolant in place of the plumbing industry product? It seems to me that the properties required in this product is well contained in the auto product as well and 75% cheaper in price. My system consists of radiant floor...
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