 Ultra Series 2 Gas Boiler
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 Highest efficiency comfort heating
Models: UG-80, UG-105, UG-155, UG-230, UG-310
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Key Features
- 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
- *Ultra 310 93.3% AFUE rating is a gross output and combustion efficiency.
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