A.O. Smith Signature 100 40-Gallon Short 38000-BTU Direct Vent Natural Gas Water Heater - Item #853425 | Model #G6-DVS4038NV
A. O. Smith's Signature 100 Series 40-Gallon Tall Low NOx Direct Vent Natural Gas Water Heater is designed to provide efficient and reliable hot water for households with 3 to 4 people when sized appropriately. With an environmentally friendly 38,000 BTU Low NOx gas burner, this natural gas water heater delivers 64 gallons of hot water in the first hour. It has an electronic gas valve that provides precise temperature control for optimum hot water delivery without the need for an external power source. For your convenience, the gas valve also includes an LED status indicator for diagnostics reporting and a push button ignition to simplify the startup process. A. O. Smith's 40-gallon natural gas water heater is designed with your safety in mind. With a built-in safety system, this model reduces the risk of accidental flammable vapor ignitions. A factory-installed temperature and pressure relief valve and tamper-proof drain valve also ensures safe operation. This model is built to last. It features Tank Guard® which is designed to provide ultimate tank protection and increase lifespan of the water heater. This added protection comes with a 6-year limited warranty to give you additional peace of mind. Call 1-877-GOLowes to get this water heater installed.
Features
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Delivers the ideal amount of hot water for households with 3 to 4 people when sized appropriately
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Features an environmentally-friendly 38,000 BTU low NOx burner that delivers 84 gallons in the first hour
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Electronic gas valve provides precise temperature control for optimum hot water delivery
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Self-diagnostic electronic gas control incorporates an LED status indicator that monitors and reports on the system's operational status
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Built-in safety system reduces the risk of accidental flammable vapor ignitions
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Short 49.75-in H x 22-in diameter design is ideal for condensed spaces like under staircases and closet installations
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Direct vent installs through side wall
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High-altitude certified from 0 ft to 7,700 ft
What our Experts Think
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Reliable hot water for everyday homes: Built to deliver enough hot water for 3–4 people with a 38,000 BTU Low‑NOx direct vent burner and up to ~84 gallons first‑hour output when sized properly.
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Direct‑vent sealed combustion: Pulls outside air for combustion and vents through a side wall, improving safety and reducing indoor air quality concerns in compact utility spaces.
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Precise and easy temperature control: Electronic gas valve with self‑diagnostic LED indicator gives accurate temperature regulation and simple operational feedback for cleaner performance.
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Space‑saving short design: Short 49.75″ height × 22″ diameter fits conveniently into closets, basements, or utility areas where floor space is limited.
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Built‑in safety systems: Factory‑installed safeguards reduce the risk of accidental flammable vapor ignition and provide temperature and pressure relief for code‑compliant operation.
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High‑altitude capable: Certified for installations from 0 ft to ~7,700 ft elevation, ensuring broad geographic flexibility.
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Durable tank protection: Signature 100 Series includes Tank Guard® corrosion resistance and a 6‑year limited residential warranty for long‑term peace of mind.
Q&A
Q: What household size is this water heater best for?
A: Ideal for households of 2–3 people, providing reliable hot water for showers, sinks, and daily use.
Q: What type of fuel does it use?
A: Operates on natural gas with a direct vent system for efficient and safe indoor installation.
Q: How powerful is the heater?
A: Features a 38,000-BTU burner, providing fast recovery and consistent hot water.
Q: What are the dimensions of the short design?
A: Designed to fit tight spaces, making it ideal for closets, basements, or compact utility areas.
Q: What safety features are included?
A: Comes with a temperature and pressure relief valve and other standard protections for safe operation.
Q: Is it energy efficient?
A: Yes. The direct vent design helps maximize energy efficiency and reduce heat loss.
Q: How is the tank protected from corrosion?
A: Equipped with a protective anode rod and premium tank materials to extend lifespan.
Q: What are the installation requirements?
A: Requires natural gas connection, proper venting, and indoor residential installation.
Maintenance Tips
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Flush the tank annually: Drain and flush every 6–12 months to remove sediment buildup that reduces heating efficiency and protects the tank.
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Inspect the anode rod: Check the sacrificial anode rod yearly and replace if heavily corroded to prevent internal rust.
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Check gas and venting connections: Ensure direct vent pipes, gas lines, and fittings are secure, unobstructed, and corrosion-free.
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Test the T&P relief valve: Operate the temperature & pressure relief valve yearly to ensure it opens properly and safely.
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Monitor burner operation: Watch for irregular ignition or flame color changes, which may indicate venting or gas issues.
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Inspect for leaks: Regularly check water connections, fittings, and tank base for moisture, corrosion, or leaks.
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Maintain proper airflow and space: Keep the surrounding area clean, dry, and well-ventilated for safe operation and easy maintenance.
Damage 
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