The GV+ gas boiler is one of the greenest cast iron boilers on the market. Our durable cast iron primary heat exchanger extends product life. 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.

• Up to 92% AFIE
• Durable cast iron primary heat exchanger
• Stainless steel secondary condensing heat exchanger
• Unique 7 pass heat exchanger design
• Vents with PVC
• Multiple venting options
• Down-fired counter flow boiler design
• Built-in dual circulator strategy
• Low water temperature capable
• Unique control design with easily integrated outdoor reset
• Diagnostic trouble shooting