Product Specifications

  • Model: DM80T250-3N

  • Serial: DG 9408879

  • Type: Commercial Gas Water Heater with Flue Damper and Millivolt Ignition (Natural Gas)

  • Tank Capacity: 80 gallons (nominal)

  • Input Rating: 250,000 BTU/hr

  • Fuel: Natural Gas (some variants support LP/propane; confirm with "-N" suffix for natural)

  • Vent Type: Atmospheric vent with automatic flue damper (reduces standby heat loss and improves overall efficiency)

  • Efficiency: Approximately 80% (thermal efficiency rating typical for this series)

  • Ignition: Millivolt (standing pilot, no external power required for ignition)

  • Height (Floor to Top): Approximately 68-3/8 inches (varies slightly by exact variant; some listings show ~72-3/4 inches overall)

  • Diameter: Approximately 28-1/4 inches

  • Water Connections: Typically 1-1/2" NPT (hot/cold); gas connection 3/4"

  • Warranty: Often 3-year limited tank warranty + 1-year on parts (commercial models; check specific warranty card or site for exact terms)

  • Key Features:

    • Automatic flue damper for energy savings

    • Hydrojet® sediment reduction (in some series variants)

    • Vitraglas® lining with Microban® antimicrobial protection (common in Bradford White tanks)

    • Designed for commercial applications with high recovery rates

Equipment Manual

Service and Maintenance Instructions

Important Safety Note: Gas water heaters involve natural gas, combustion, venting, and high temperatures. All service, maintenance, or repairs should be performed by a qualified professional plumber or technician. Improper handling can result in fire, explosion, carbon monoxide poisoning, or property damage. Turn off gas supply and power (if applicable) before any work.

General Maintenance Recommendations (from Bradford White commercial gas series guidelines)

*Recommended annual inspection*

  1. Annual Inspection and Flushing:

    • Inspect the anode rod(s) (magnesium plug-type in many models). Replace if heavily depleted (less than 50% remaining) to protect the tank from corrosion.

    • Flush the tank to remove sediment buildup (common in hard water areas). Drain a few gallons from the drain valve, then refill while running hot water to stir sediment.

    • Check venting system for blockages, corrosion, or leaks. Ensure proper draft and no backdrafting.

  2. Pilot and Burner Maintenance:

    • Check the standing pilot flame (should be blue with minimal yellow tipping). Clean orifice if dirty.

    • Inspect burner tubes and rack for lint, dust, or debris. Clean as needed (remove burner assembly per parts list guidance).

    • Verify thermocouple/millivolt system is producing sufficient voltage (typically 20-30 mV open circuit).

  3. Flue Damper:

    • Ensure the automatic damper opens/closes properly during operation. Clean or lubricate linkage if sticky.

    • Test damper operation during burner firing.

  4. Temperature and Pressure Relief Valve (T&P Valve):

    • Test annually by lifting the lever (water should discharge). Replace if it leaks or doesn't operate.

  5. Gas Valve and Controls:

    • Check for proper gas pressure (inlet/outlet per manual specs).

    • Clean thermopile/thermocouple connections.

  6. General Checks:

    • Inspect tank exterior for leaks or corrosion.

    • Verify temperature setting (typically 120-140°F for safety/efficiency; never exceed manufacturer limits).

    • Check for error codes or pilot outage issues (millivolt models rely on pilot generator).

Common Service Procedures (Qualified Technicians Only)

  • Refer to the official service manual (often covering Millivolt DM series, e.g., parts list 238-42625-00 or similar) for diagrams.

  • Burner removal/cleaning: Disconnect gas, remove burner rack, clean tubes/orifices.

  • Anode replacement: Drain tank partially, remove anode plug, install new one.

  • Dip tube replacement (if clogged): Access top cold inlet.

  • Gas valve replacement: Match exact part (e.g., natural gas valve from parts list).