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MAXIM OIL and Combination GAS/OIL Water Heaters

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.


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


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

Burner / Venting

  • #2 Oil or Combination Gas and #2 Oil. Power combustion burner.
  • Gas and oil trains are UL compliant.
  • Product vents negatively through type L double-wall material.
    Sidewall vents with power venter assistance (not supplied).
  • Direct combustion air connectable through optional burner 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.
  • 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.