The ProMax® Ultra-Low NOx gas water heater delivers an efficient, reliable performance and features an innovative design that protects against accidental ignition of flammable vapors.
The GPNH-40 has a 50 gallon tank, a 6 year limited tank warranty and meets Ultra Low-NOx emissions requirements.
single shower length
at the same time
maximum tub size
time to fill tub
estimated energy cost
Many factors affect the actual performance of a water heater. This represents our closest approximation of your likely experience with this water heater in Woodbridge, NJ, but actual performance may vary depending on factors beyond our ability to control or estimate. To view or adjust our assumptions of the most common factors that impact this product’s performance in Woodbridge, NJ, please view the advanced settings. *Annual energy costs are estimated from the energy efficiency of each water heater, your household’s estimated water usage & set temperature, the average groundwater temperature for your location, and residential energy prices as reported by the Department of Energy.
Thanks to the improved technology, the inlet tube features water jets that redirect incoming cold water into the tank, creating turbulence, which helps reduce lime build-up, therefore maintaining heater efficiency.
A. O. Smith’s anode rods have a stainless steel core that extends the life of the anode rod allowing superior tank protection far longer than standard anode rods.
• Solid brass, tamper resistant, enhanced-flow, ball type, valve.
• Uses a standard female hose fitting that allows for fast and easy draining during maintenance.
• Screwdriver slot features a 1/4 turn radius, for straight-through water flow and a quick and positive shut off.
Top-mounted T&P relief valve available as an option.
Gas water heaters heat water by burning either natural gas or LP (propane). Gas water heaters need a source of air and also need to be vented properly. Cold water enters the water heater through an internal “dip tube” which forces the cold water to the bottom of the tank and pushes hot water out through the outlet connection. This arrangement provides the most hot water for a given tank size. Most gas water heaters use a pilot light. The pilot light on some models also generates the power needed to operate an electronic gas valve. When cold water enters the tank, the temperature sensor on the gas control tells the main gas valve to open. Gas flows to the burner where it is lit by the pilot light. The air needed by the burner is supplied by the room where the water heater is installed. The exhaust gases are vented to the outside. When the proper temperature is reached, the main gas valve shuts off. Because water can corrode the steel tank, we glass line the inside of the tank and install an anode rod to help reduce corrosion. The temperature and pressure relief valve is a safety device designed to open if the internal temperature or pressure of the tank exceeds certain limits. Water heaters should be large enough to provide adequate hot water even when temperatures are cold and household demand is greatest.
The ProMax® family of gas water heaters offers a wide range of water heating solutions. The high efficiency, side loop venting, Ultra-Low NOx and high recovery models are ideal for families with high demand for hot water.
Rebate and incentive programs provide cash-back to consumers for the purchase of appliances that meet certain energy efficiency
standards. Often, these standards are tied to the ENERGY STAR® program.
Cash for Appliances is designed to encourage the purchase of energy efficient appliances. Consumers who purchase ENERGY STAR® or
CEE qualified appliances can receive cash rebates. Most states are offering rebates in the $50 to $250 range.
Please click here to download the hi-resolution images.
There's no reason to run out of hot water. If you're not sure that the GPNH-40 provides enough hot water for your needs, consider these:
©2016, A. O. Smith. All Rights Reserved. 1-800-527-1953A. O. Smith reserves the right to make product changes or improvements at any time without notice.