GV90+ Gas Boiler Weil-McLain

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  • 91% AFUE efficient
  • Durable cast iron primary heat exchanger
  • Condensing stainless steel secondary heat exchanger
  • Unique 7 pass heat exchanger design maximizes heat transfer
  • Vents with PVC
  • Multiple ventilation options (direct vent, direct exhaust, concentric)
  • Easy conversion to propane (kit included)
SKU: GV90+ Category:
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GV90+ Gas Boiler Weil-McLain with 91% AFUE efficient. Durable cast iron primary heat exchanger. Condensing stainless steel secondary heat exchanger. Unique 7 pass heat exchanger design maximizes heat transfer. Vents with PVC. Multiple ventilation options direct vent, direct exhaust, concentric. Easy conversion to propane kit included.


GV90+ Gas Boiler Weil-McLain Features:

  • Factory Tested
  • Insulated Extended Steel Jacket
  • Cast Iron Sections with Built-in Air Separator
  • Stainless Steel Secondary Heat Exchanger with Air Separator
  • Steel Base
  • Control Module with Indicator Lights
  • Blower Assembly with Observation Port
  • Gas/Air Manifold Assembly
  • Gas/Air Orifice Plate for Natural Gas (separate plate furnished for conversion to propane)
  • Stainless Steel Burner Cone and Ring Assembly
  • Negative Regulation Gas Valve
  • Hot Surface Ignition System
  • Air Pressure Switch
  • System Circulator
  • Built-in-Bypass Circulator System with Sensor for Temperature Control
  • Condensate Drain Trap
  • Sidewall Vent Termination Kit
  • 40VA Transformer
  • Electrical Junction Box
  • 30 PSI ASME Relief Valve (boiler sections & secondary heat exchanger tested for 50 PSI working pressure)
  • Water Temperature Limit Switch
  • Section Block Temperature Limit Switch
  • Combination PressureTemperature Gauge
  • Drain Valve


Maximum Heat Exchanger Performance

  • Durable cast iron primary heat exchanger extends GV90+ Gas Boiler Weil-McLain life – it is not uncommon for cast iron boilers to last in excess of 40 years.
  • Corrosion resistant stainless steel condensing secondary heat exchanger, increases efficiency up to 5% by recouping heat energy from exhaust normally wasted when vented from the building


Reliable Boiler Design

  • Unlike most high efficiency boilers in the industry, the Weil-McLain GV90+ has extrawide waterways (over 2”) allowing sludge and debris, often present in older systems, to flow through easily. This limits scale build up, which reduces boiler efficiency, performance and can lead to premature boiler failure.
  • Down-fired, counter flow boiler design improves boiler efficiency. The GV90+ offers pass design in the primary heat exchanger and pass design in the secondary heat exchanger maximizing heat transfer and optimizing boiler efficiency.


Proven Control Strategy

  • The control platform features error-proof, labeled, snap in connections. Tested at over 100,000 cycles, and boasting a failure rate of less than 1% over 20 years, it is sure to provide years of worry-free operation.
  • Unlike traditional cast iron boilers, the GV90+ offers a unique control design allowing easy integration of outdoor reset to take advantage of low water temperatures and improve overall system energy cost savings.

Additional information



Energy Efficiency

Up to 91% AFUE