As an Amazon Associate, we earn from qualifying purchases. A.O. Smith . 100123273 A.O. Smith . 100123273 Gallery Attributes Brand name, Manufacturer name, ManufacturerA.O. Smith Attribute00ANSI Z21.10.3 Attribute01Residential Attribute02190000 Attribute03, Attribute05, Attribute10, Attribute13, Attribute21No Attribute04For Sale in CA Attribute069-1/2 in Attribute07Yes Attribute088 gpm Attribute09Natural Gas Attribute11Energy Star, Yes Attribute1220-1/4 in Attribute14Electronic Ignition Attribute15Outdoor Attribute16Horizontal Mount, Vertical Mount Attribute17190 Attribute18Gas Attribute193/4 in Attribute20AATO31000N000000 Attribute220.8 Attribute23Power Vent/Power Direct Vent Attribute24Tankless Attribute2513-3/4 in AttributeKey00ANSI Specifications AttributeKey01Application AttributeKey02BTU AttributeKey03CARB OTC LEED Compliant AttributeKey04CEC Compliant AttributeKey05Condensing AttributeKey06, length_AttribDepth AttributeKey07Energy Star Compliant AttributeKey08Flow Rate AttributeKey09Fuel Type AttributeKey10GSA Approved AttributeKey11Green AttributeKey12, height_AttribHeight AttributeKey13IAPMO Listed AttributeKey14Ignition System AttributeKey15Indoor Outdoor AttributeKey16Installation Type AttributeKey17MBH AttributeKey18Power Source AttributeKey19Supply Pipe Connection AttributeKey20Type AttributeKey21UL Listed AttributeKey22Uniform Energy Factor UEF AttributeKey23Vent Type AttributeKey24Water Heater Type AttributeKey25, width_AttribWidth DimensionUnitinch depth, length9.5 height20.25 moq, multiple1 MPN100123273 qtyInStockCall for Availability SKU4124989 width13.75 Distributor offers SellerSKUMOQIn stockMultiplePrices ferguson.com41249891Call for Availability1