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1. | A O Smith Boiler GWGWO 1000 ManualFEATURES 84% THERMAL EFFICIENCY The absolute highest thermal efficiency possible by a non-condensing boiler is achieved by the new Genesis Boiler. Low NOx Precise amounts of gas and air are premixed through special Pre-Jet Orifices and forced through stainless steel burners that provide complete and clean combustion. Meets or exceeds California SCAQMD air quality standards. EXCLUSIVE DIA-SCAN II W/STAGED FIRING The Dia -Scan II is a complete microprocessor based boiler control. Every elect... Brands:A | User Manual | ENGLISH | [View] | ||||||||||