Type H Hydronic Boilers -- Residential -- Commercial Residential Boiler Requires automatic vent dampers, IID ignition. Commercial Boiler Used when heating non-residential buildings. Efficient Thermal efficiency 82%. Highest of any atmospheric boiler available today. Thermal Shock Proof 20-year warranty against thermal shock damage up to 150°F differential. Maximum operating temperature: 230°F. Light Weight A floor load up to 70 lbs/sq. ft. or less. High Recovery Cuts fuel costs substantially because the standby and radiation losses normal to other boilers and tank-type water heaters are eliminated. Low Water Operating Temperature Operates with water temperature as low as 105°F without condensation.

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