The ProLine® XE Effex® High Efficiency atmospheric gas water heater is an ideal choice for replacement application, delivering the highest efficiency ratings among standard gas models and helping you save as much as 25% on water heating costs.

AO Smith® Effex® Gas Water Heater, Series: GAHH-40, 40000 Btu/hr Heating, Natural Gas, 40 gal Tank, Electronic Ignition, Atmospheric Vent, 3 in, 4 in Vent, 43 gph at 90 deg F Recovery, Energy Factor: 0.7, 3/4 in Water Connection, 150 psi, Tall or Short: Tall, Ultra Low Nox: No, 20 in Dia x 61-3/4 in H

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  Catalog-1 https://www.auersteel.com//ASSETS/DOCUMENTS/ITEMS/EN/AO_Smith_100051462_Catalog.pdf
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  Data/Spec Sheet-1 https://www.auersteel.com//ASSETS/DOCUMENTS/ITEMS/EN/A_O_Smith_GHH4000L010000_Data_Sheet.pdf

• Installation friendly - allows for easy replacement of standard atmospheric vent heaters, easily connects to existing b-vent
• Fan-assisted, category 1 appliance - Plugs into standard 110/120 V outlet
• 24 V electronic controls - Tighter differential for more consistent hot water delivery
• Electronic ignition - The durable hot surface ignitor eliminates pilot relight issues
• LCD user interface easy-to-read, eye level display, simple temperature settings and adjustments, service diagnostics are in plain text
• Powered anode rod powered anodes are non-sacrificial, so they do not deplete over time, additionally, they provide exceptional performance in all water conditions
• Meets energy efficiency requirements for most gas utility rebate programs and is ENERGY STAR® Qualified
• Durable tamper-resistant brass drain valve
• Dynaclean™ diffuser dip tube - Helps reduce lime and sediment build up, maximizes hot water output, made from long-lasting PEX cross-linked polymer
• Green Choice® gas burner - Patented "Eco-Friendly" design reduces NOx emissions by up to 33% and complies with low- NOx emission requirements of less than 40 ng/J
• Approved for installation from sea level to 10100 ft elevation