- 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.