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MAXIM GAS Water Heater

Available with AquaPLEX Duplex Alloy

MAXIM is a vertical fire tube storage water heater with a power combustion burner. It combines medium to high recovery capacity and storage in a small footprint. Low NOx available in selected models.


  • 81% thermal efficiency.
  • Meets ASHRAE 90.1-2010.
  • Heaters qualify for LEED certification.

Inputs / Storage

  • 125 gallon tank: 199 - 270 - 400
    - 540 - 720 - 800 MBtu
  • 250 gallon tank: 270 - 399 - 540
    - 720 - 800 - 1000 - 1200 MBtu

Burner / Venting

  • Natural gas or LP.
  • Power combustion burner.
  • Gas trains are UL compliant and include dual safety shutoff valves
    and gas pressure regulator.
  • Product vents negatively through type B double-wall material.
    Sidewall vents with power venter assistance (supplied by others).
  • Direct combustion air connectable through optional buner adapter.

Corrosion Protection

  • AquaPLEX® engineered duplex alloy storage tank.
  • Fire tubes are 100% AquaPLEX® duplex alloy.
  • All tank connections are non-ferrous and removeable.
  • Lining protection is not compromised when pipe is threaded into fittings.


  • ETL listed to US and Canadian safety standards.
  • FM compliant.
  • SCAQMD certified for NOx compliance.
  • ASME, section IV, part HLW stamped
    and National Board Registered.
  • CSD-1 (GE-GAP) controls optional.


  • AquaPLEX tank with 15-year warranty

Tank warranty covers leaks, production of discolored /rusty water, chloride stress corrosion cracking or defects in material or workmanship

  • One-year parts warranty
  • Three-year scale failure warranty
  • First-year service policy  (freight and labor coverage)
  • Long-life service policy (optional)

Information provided above is summary only. Refer to written warranties and service policies for full details.