Ultra Series 3 Gas Boiler

• 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
• U-Control gives you the power for easy set-up and maintenance
• Modulates with 5 to 1 turn-down 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
• *Ultra 310 93.3% AFUE rating is a gross output and combustion efficiency.