As an Amazon Associate, we earn from qualifying purchases. A.O. Smith . 100158723 A.O. Smith . 100158723 Gallery Attributes Brand name, Manufacturer name, ManufacturerA.O. Smith Attribute00ANSI Z21.10.1 Attribute01Residential Attribute0240000 Attribute03CSA 4.1 Attribute0440 gal Attribute05ProLine® Attribute0622 in Attribute07Bottom Attribute08Brass Attribute09, Attribute14, Attribute33No Attribute10Low Nox Attribute11, Attribute12, Attribute13NPT Attribute1567 Attribute16, Attribute17, Attribute183/4 in Attribute19Natural Gas Attribute2051-1/2 in Attribute21150 Attribute22Piezo Igniter Attribute23Vertical Mount Attribute24Blue Diamond® Glass Attribute2540 Attribute26Aluminum, Stainless Steel Attribute27Polymer Attribute28300 psi Attribute29155 Attribute30Gas Attribute311/2 in Attribute32Up to 155 Deg F Attribute340.59 Attribute35Atmospheric Vent Attribute36Top Attribute3730 - 40 gal Attribute38Short AttributeKey00ANSI Specifications AttributeKey01Application AttributeKey02BTU AttributeKey03CSA Certified AttributeKey04Capacity AttributeKey05Collection AttributeKey06, length_Attrib, width_AttribDiameter AttributeKey07Drain Location AttributeKey08Drain Valve Material AttributeKey09ETL Listed AttributeKey10Emission AttributeKey11End Connection 1 AttributeKey12End Connection 2 AttributeKey13End Connections AttributeKey14Energy Star Compliant AttributeKey15First Hour Rating AttributeKey16Fitting Size 1 AttributeKey17Fitting Size 2 AttributeKey18Fitting Sizes AttributeKey19Fuel Type AttributeKey20, height_AttribHeight AttributeKey21High Pressure AttributeKey22Ignition System AttributeKey23Installation Type AttributeKey24Lining of Tank AttributeKey25MBH AttributeKey26Material AttributeKey27Material Type AttributeKey28Maximum Pressure AttributeKey29Maximum Temperature AttributeKey30Power Source AttributeKey31Supply Pipe Connection AttributeKey32Temperature Range AttributeKey33UL Listed AttributeKey34Uniform Energy Factor UEF AttributeKey35Vent Type AttributeKey36Water Connections AttributeKey37Water Heater Capacity Range AttributeKey38Water Heater Type DimensionUnitinch diameter, length, width22.0 height51.5 moq, multiple1 MPN100158723 qtyInStockCall for Availability SKU5096555 Distributor offers SellerSKUMOQIn stockMultiplePrices ferguson.com50965551Call for Availability1