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Weil-McLain AquaBalanceModel Series 2 -Compact High Efficiency Boiler

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The Weil-McLain AquaBalance® Series 2 is a compact, high-efficiency boiler ideal for residential and light commercial use. With up to 95% AFUE, it offers both combi and heat-only models, delivering reliable space heating and domestic hot water. Key features include a durable stainless steel heat exchanger, ENERGY STAR® certified, and low NOx emissions.

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FLEXIBLE SIZING

  • Available in 80, 120 and 155 MBH inputs sizes
  • All 3 sizes available in heat-only, or combination space and domestic hot water heating versions

DURABLE DESIGN

  • 1″ diameter ASME certified 316L stainless steel single tube heat exchanger – low pressure drop
  • Heavy gauge insulated jacket – provides quiet operation

HIGH EFFICIENCY

  • 95% AFUE energy efficiency
  • Low NOx SCAQMD compliant

EASY INSTALL / MAINTENANCE

  • Contractor-friendly removable sides
  • Pre-wired, plug-in ready electrical design
  • Commercial grade 120V power 6′ cord with 3 prong plug
  • Wall mounting bracket and hardware
  • Venting
  • Unique “3-in-1” vent adapter – readily accepts PVC, CPVC, SS or PP vent materials
  • Multiple vent options – direct vent, 2 pipes or concentric, through roof or sidewall

USER-FRIENDLY CONTROL

  • Digital Honeywell boiler control
  • Easy to read display with simple status icons

VERSATILE HEATING

  • Natural or Propane (LP) gas operation – shipped as NG, optional LP conversion kit available
  • 4 gallons per minute DHW 155 combi (70-degree rise)
  • Internal 3-speed Grundfos circulator (combi versions only)

EXTENDED WARRANTY

  • 10 year limited warranty heat exchanger for residential use
  • 5 year limited warranty heat exchanger for commercial use
  • 2 year limited warranty all other parts