Ultra Gas S3 CT Gas Boiler offers Boiler Intelligence for Every Heating Need

Optimal Efficiency for Multiple Temperatures - Quick System Presets to Match any Application - Seamless Multiple Boiler Control

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