DURAWATT® ELECTRIC - a SUPERTANK® Water Heater
DURAWATT is a heavy-duty, medium to very-large capacity electric water heater. Design avoids large, high-kilowatt tube bundles that can be difficult to maintain. Instead individual heating elements rated at 9 or 18kW are combined for higher wattage requirements. Elements are Incoloy sheathed with bronze mounting flanges. Element circuits are protected by fused magnetic contactors. Proportional (staged) sequencing of heating elements is available.
Now available with an electronic operating controls that are Modbus connectable to a building automation system.
Available with AquaPLEX®, a fully passivated, high-chromium duplex material that requires no lining. Naturally impervious to water corrosion and provides superior resistance to chloride stress corrosion cracking compared to 316L stainless steel. ASME approved material.

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  • Efficiency
  • Inputs
  • Storage
  • Voltages
  • Certifications
  • Corrosion Protection
  • Warranties
  • Literature
Electric water heaters are considered to be > 98% efficient.
Meets ASHRAE 90.1-2010.
Heaters qualify for LEED certification.
Individual 9kW and 18kW heating elements can be combined for a maximum standard output of 360kW.
Maximum kW varies by tank size, consult submittal documents.
Customized heaters available with higher inputs.
Heating elements can be energized in up to 10 stages.
Vertical orientation: 150 - 175 - 225 - 250 - 300 - 400 - 500 - 600 - 750 - 900 - 1000 - 1250 - 1500 - 1750 - 2000 - 2500 - 3000 - 3500 - 4000 and 4500 gallons.
Horzontal orientation (custom): 250 - 400 - 500 - 600 - 750 - 900 - 1000 - 1250 - 1500 - 1750 - 2000 - 2500 - 3000 - 3500 - 4000 and 4500 gallons.
480V, 3-phase is standard construction.
Optional voltages are 240/1, 208/3, 240/3, 380/3, and 600/3.
ETL listed to US and Canadian safety standards.
ASME, section IV, part HLW stamped and National Board Registered.
AquaPLEX® engineered duplex alloy available on selected models.
All models available with NICKELSHIELD® nickel-plated storage tank -or- POLYSHIELD® polymer-lined storage tank
All tank connections are non-ferrous and removeable. Lining protection is not compromised when pipe is threaded into fittings.
NO ANODE RODS REQUIRED OR USED. Click on "TECHNOLOGIES" for more information.
With AquaPLEX® engineered duplex alloy (unlined tank) standard tank warranty is 10 years with a 20-year option.
AquaPLEX heaters are also covered by a 10-year warranty against chloride stress corrosion cracking.
With NICKELSHIELD® nickel-plated tank, standard tank warranty is 10 years with a 20-year option.
With POLYSHIELD® polymer-lined tank, standard tank warranty is 5 years with a 15-year option.
First-year service policy is standard. Pays for freight and labor for warranty covered fault or defect.
Long-life service policy is optional. Extends payment for freight and labor on warranty covered vessel repair or replacement.
Information provided above is summary only. Refer to written warranties and service policies for full details.