- Gas fired water boiler with cast aluminum heat exchanger

- Venturi mixing body mixes air and gas providing higher efficiency

- Designed to operate in low temperature condensing applications

- Outdoor reset and domestic hot water priority standard

- Negative regulated gas valve precisely delivers gas to the boiler

- Electronic control module automatically adjusts blower speed and gas flow rate in response to environment

- Modulates with 5 to 1 turndown ratio

- Variable speed motor matches combustion output to heating needs

- High grade stainless steel burner features quiet operation, high efficiency, and cleaner combustion for low NOx applications