Suggested Specification

Commercial Gas Boilers

The hot water supply boiler(s) shall be an A. O. Smith Genesis® Model GW ___________________ having an input rating of __________________ BTU/hr.

and capable of supplying no less than _________________GPH at a 100ºF temperature rise when fired with Natural/Propane gas. The boiler shall bear

the ASME “H” stamp and shall be National Board registered for 160 PSI working pressure. The boiler shall be test certified at 84% thermal efficiency by CSA per ANSI Z21.13/CSA 4.9 Harmonized Standard Latest Addenda. The boiler’s copper fin tube heat exchanger shall be a horizontal, single row, two pass design. The solid copper tubes shall have integral extruded copper fins spaced at “7” fins per inch, and be rolled into heavy steel tube sheets. High temperature silicone “O” rings shall provide a watertight seal between each tube and the ASME code Bronze/Cast Iron headers. Headers must be field removable to allow complete inspection of all waterways. Non-removable headers, with tubes rolled directly into the headers, shall not be acceptable. The low mass, low water volume heat exchanger shall be explosion-proof and immune to thermal shock.

The combustion chamber shall be fully lined with high temperature ceramic fiber insulation, rated to 2,300°F. The jacket panels shall be coated with a baked-on powder-coat finish, suitable for outdoor service. The jacket shall be of tight construction, and weather- and water-resistant.

The hot water supply boiler(s) shall be supplied with a factory supplied, sized and wired boiler-circulating pump.

The boiler shall employ a fan induced premixed multi-burner system firing into a pressurized combustion chamber. Atmospheric or power burners will not be acceptable. Only stainless steel/titanium alloy burners will be acceptable. All boiler functions shall be controlled, operated, and monitored by a microprocessor-based control. The microprocessor shall control the boiler temperature and be accurate to within plus or minus 1°F. The hot surface ignition system shall employ a separate flame sensor for maximum reliability.

The boiler shall be supplied with a remote tank thermistor for sensing and controlling the hot water storage tank temperature up to 1,000 feet away. Provisions for connecting a remote thermistor, alarm bell, pump, and alternate temperature controller must be provided.

Factory mounted and wired flow, blower prover, and blocked flue switches shall be provided. The gas train shall meet or exceed the requirements of ANSI Z21.13 and include gas pressure regulator, manual gas cock, redundant safety gas valve, operating control valve, and plugged pressure test tapings. The ASME rated pressure relief shall be factory installed.

The boiler shall be certified for direct horizontal through-the-wall venting, or direct vertical venting; in addition to sidewall or conventional vertical venting. The boiler must be field convertible from top mounted venting to rear mounted venting. The boiler shall be capable of horizontal sidewall or direct venting up to 35 equivalent feet without the aid of any optional sidewalll vent fans or blowers.

For Technical Information and Automated Fax Service, call 800-527-1953. A.O. Smith Corporation reserves the right to make product changes or improvements without prior notice.

Revised November 2008	PG 4 OF 4
www.hotwater.com	AOSDG25200

GW/GWO-750, GW/GWO-300 specifications

A.O. Smith is a reputable manufacturer known for its high-quality water heating solutions, and the GW/GWO-300 and GW/GWO-750 models exemplify the brand's commitment to performance and reliability. These gas water heaters are engineered to provide ample hot water for residential and commercial applications, making them an ideal choice for various settings.

The GW/GWO-300 and GW/GWO-750 models feature a robust design that ensures longevity and efficiency. Both units are available in natural gas and propane varieties, allowing users to select the fuel type that best suits their needs. One of the standout features of these models is their energy efficiency. They are equipped with advanced insulation, which minimizes heat loss, ensuring that hot water is readily available while reducing energy costs.

In terms of technology, these models utilize a reliable burner system that ensures quick heating and consistent output. The GW/GWO-300 boasts a capacity of 30 gallons, making it suitable for smaller households or light commercial use. The GW/GWO-750, on the other hand, offers a significantly larger capacity of 75 gallons, catering to larger households or businesses that require a steady supply of hot water.

Both models come with an integrated thermostat that provides precise temperature control, allowing users to set their preferred water temperature for maximized comfort. Additionally, they are equipped with a digital display that provides vital data, such as water temperature and system performance metrics, ensuring users can monitor their water heating system effortlessly.

Safety features are also a key aspect of the GW/GWO series. These models include advanced safety mechanisms such as flame arrestors and temperature-pressure relief valves, ensuring user safety and protecting the unit from overheating or excessive pressure buildup.

Moreover, A.O. Smith places a strong emphasis on customer support, offering comprehensive warranties and accessible customer service. This dedication to service adds an extra layer of confidence for users investing in the GW/GWO-300 and GW/GWO-750 models.

In summary, the A.O. Smith GW/GWO-300 and GW/GWO-750 water heaters represent a blend of efficiency, safety, and advanced technology. With their varying capacities and user-friendly features, these models are designed to meet diverse hot water needs, making them a smart choice for anyone looking to invest in a reliable water heating solution.