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AO Smith Products

AO Smith XCV40

XCV40 40 Gallon 40,000 BTU Natural Gas ProMax Tall Model Residential Gas Water Heater with Dynaclean Diffuser Dip Tube, Durable Tamper-Resistant Brass Drain Valve, and 10 Year Warranty


Items that are currently in-transit to our warehouse, are currently in-stock at a drop-ship vendor’s, or manufacturer's warehouse will be marked as "Available". These products will ship once your order is processed (usually within 24-48 business hours). For any exceptions to this timeframe, an ETA (Estimated Time of Arrival) for your order will be emailed with accurate shipping dates in order to ensure that you are always updated and informed as to when your order will arrive at its final destination.

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  • Width: 18"
  • Height: 61.75"

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Discontinued No longer available.

ProMax is an economical water heater designed for households that need an exceptional performer. Featuring a 40-gallon tank and a 40,000 BTU gas burner, the XCV-40 delivers a first hour rating of 70 gallons and a recovery rate of 41 gallons per hour. Available at AppliancesConnection


For millions of consumers, business owners, property managers and engineers worldwide, A. O. Smith has delivered innovative hot water solutions for over 70 years. Sold exclusively by plumbing wholesalers and plumbing contractors, A. O. Smith’s selection of residential and commercial water heaters, boilers and storage tanks is unmatched for quality and diversity. Anywhere hot water is needed, A. O. Smith can provide an energy-efficient solution with maximum value during and for years after installation. And, A. O. Smith stands behind its products and its customers with world-class service, combining cutting-edge technology with committed people who take pride in being the very best.


  • Dynaclean diffuser dip tube - helps reduce lime and sediment buildup, maximizes hot water output. Made from longlasting PEX cross-linked polymer.
  • Green Choice gas burner - patented "Eco-Friendly" design reduces NOx emissions by up to 33% and complies with Southern California and Texas requirements
  • Coregard magnesium anode
  • Push-button Piezo ignitor - makes lighting pilot fast and easy with one-hand push-button spark ignition
  • Durable tamper-resistant brass drain valve
  • Permaglas glass coating -protects steel tank from rust
  • CSA certified and ASME rated T&P relief valve
  • External heat trap nipples supplied on all models EXCEPT XCV-50/GCV-50
  • Equipped with C3 technology


Application: Plumbing
Capacity: 40 Gallon
BTU Input: 40,000
Type: Natural Gas (NG)
Vent Size: 3"
Water Connection: 3/4"
Height: 61-3/4"
Diameter: 18"
Weight: 138 lbs
Gas Connection: 1/2"
1st Hour Delivery (Gallons): 70
Recovery 90°F Rise: 41 gal/hr
Energy Factor: 0.59
Warranty: 10 yr Tank/6 yr Parts Limited


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  • Brand:AO Smith
  • SKU:XCV40
  • UPC:671657109424
  • Stock Id:290860
  • Product Number:SMIXCV40


  • Fuel Type:Natural Gas
  • Capacity (Gallons):40
  • Tankless:No
  • Gallons Per Minute:1


  • Width:18"
  • Height:61.75"

    Technical Details

  • Usage:Residential
  • Weight:138.00 lbs