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1. | A O Smith Boiler GWGWO 300 ManualCommercial Gas Boilers 84% efficient, low-nox hot water supply boilers F eatures A. O. Smith Genesis boilers offer everything you could ask for in a non-condensing boiler. They provide the highest possible 84% thermal efficiency, outstanding venting flexibility, space-saving stackable design and a new, advanced Energy Management Control (EMC) system. Genesis models are available for installation indoors (GW Series) or outdoors (GWO Series). MODELs gw/gwo -300 thro ugh gw/gwo -750 NEW... Brands:A | User Manual | ENGLISH | [View] | ||||||||||