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CAUTION: Do not use automotive anti-freeze in the boiler waterways. If the use of antifreeze is necessary an anti-freeze specifically formulated for hydronic heating systems must be used! Water treatment is not recommended. This boiler uses gaskets made from ethylene propylene, EPT, to seal the section ports. Consult a water treatment professional before adding any chemicals to the boiler water to ensure that they are compatible with the gaskets. Failure to comply with this caution can result in