Weil‑McLain GV90+6 – 175 MBH Input, Cast‑Iron Condensing Boiler (91 % AFUE)
Designed for residential and light‑commercial hydronic systems, the GV90+ combines durable cast‑iron construction with high‑efficiency performance.
???? Key Features for Contractors
High Efficiency: 91 % DOE AFUE—delivers 161 MBH heating output from a 175 MBH input, maximizing energy savings
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Two-Stage Heat Exchanging: Robust cast‑iron primary paired with stainless‑steel secondary, employing a 5‑pass primary plus 2‑pass secondary design to optimize heat transfer and condense latent energy
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Sealed Combustion/Venting Flexibility: Compatible with 3″ PVC/CPVC/PP/SS for direct vent, direct exhaust, or concentric installations; includes condensate trap and neutralizer options
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Built‑in Dual Circulators: Internal system and bypass circulator allow for low return water temperatures without a separate mixing valve—ideal for zoning or radiant systems
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Durability & Serviceability: Extra‑wide waterways (>2″) reduce clogging risk; insulated steel jacket with removeable panels and snap‑in wiring for easier access
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Controls & Ignition: Hot-surface ignition, air-pressure switch, limit controls, and an LED-equipped boiler control module simplify setup and diagnostics
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???? Technical Specifications
Attribute GV90+6 Model (382200613)
Input (MBH) 175
DOE Output (MBH) 161
Net I=B=R Output (MBH) 140
Annual Fuel Utilization 91 % AFUE
Water Content ~6.9 gallons
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Vent Size 3″ PVC/CPVC/PP/SS
Heat Exchanger Materials Cast iron (primary); stainless steel (secondary)
Circulators System + bypass included
???? Installation & Maintenance Insights
Compact Footprint: Measures ~38″ long, 24⅝″ wide, 37¾″ tall; fits in typical mechanical rooms .
Low-Maintenance Design: Cast-iron durability combined with condensing efficiency minimizes scale; wide waterways and factory-sealed connections reduce maintenance needs
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Plug-and-Go Setup: Includes integrated circulators, wiring, junction box, plus transformer, pressure relief, and condensate trap—installation-ready with minimal field work
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Diagnostics & Controls: Factory-installed limit switches and control module with LEDs facilitate commissioning and troubleshooting .
✔ Contractor Summary
The GV90+6 is a high-performing, cast-iron condensing boiler designed for maximum efficiency and reliability. Its sealed combustion with flexible venting, dual-circulator system, and maintenance-friendly design make it ideal for modern hydronic systems. It’s rugged, easy to install, and built for longevity.