A.O. Smith Signature 100 40-Gallon Short 38000-BTU Direct Vent Natural Gas Water Heater - Item #853425 | Model #G6-DVS4038NV

• Delivers the ideal amount of hot water for households with 3 to 4 people when sized appropriately

• Features an environmentally-friendly 38,000 BTU low NOx burner that delivers 84 gallons in the first hour

• Electronic gas valve provides precise temperature control for optimum hot water delivery

• Self-diagnostic electronic gas control incorporates an LED status indicator that monitors and reports on the system's operational status

• Built-in safety system reduces the risk of accidental flammable vapor ignitions

• Short 49.75-in H x 22-in diameter design is ideal for condensed spaces like under staircases and closet installations

• Direct vent installs through side wall

• High-altitude certified from 0 ft to 7,700 ft
  

What our Experts Think

• 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.

• 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.

• Precise and easy temperature control: Electronic gas valve with self‑diagnostic LED indicator gives accurate temperature regulation and simple operational feedback for cleaner performance.

• Space‑saving short design: Short 49.75″ height × 22″ diameter fits conveniently into closets, basements, or utility areas where floor space is limited.

• 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.

• High‑altitude capable: Certified for installations from 0 ft to ~7,700 ft elevation, ensuring broad geographic flexibility.

• 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

• Flush the tank annually: Drain and flush every 6–12 months to remove sediment buildup that reduces heating efficiency and protects the tank.

• Inspect the anode rod: Check the sacrificial anode rod yearly and replace if heavily corroded to prevent internal rust.

• Check gas and venting connections: Ensure direct vent pipes, gas lines, and fittings are secure, unobstructed, and corrosion-free.

• Test the T&P relief valve: Operate the temperature & pressure relief valve yearly to ensure it opens properly and safely.

• Monitor burner operation: Watch for irregular ignition or flame color changes, which may indicate venting or gas issues.

• Inspect for leaks: Regularly check water connections, fittings, and tank base for moisture, corrosion, or leaks.

• Maintain proper airflow and space: Keep the surrounding area clean, dry, and well-ventilated for safe operation and easy maintenance.