Burnham Hydronicsintroduces Alliance SL, its newest line of indirect-fired water heaters that come in five sizes ranging from 27 to 119 gallons. Alliance SL has a seamless Hydrastone lined tank, designed specifically for a wide range of water quality applications (stone-lined tanks have shown success against corrosion for many years). Its cold water diffuser increases output by 20%, and 2-3 inches of polyurethane foam insulation offers low standby heat loss of only one-third of a degree per hour.
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