Hydronic Gas Boiler Assembly CGa-8 Natural Gas Series-3 240,000 BTU Atmospheric Chimney-Vent Heating Unit with TACO-007, No Tankless Opening

The Hydronic Gas Boiler Assembly CGa-8 Natural Gas Series-3 240,000 BTU Atmospheric Chimney-Vent Heating Unit with TACO-007, No Tankless Opening (WM-381359082) delivers the highest heating capacity in the CGa Series-3 line for demanding residential and light commercial hydronic systems. This model provides approximately 240,000 BTU input with an AFUE near 83–84 percent, using a reinforced multi-section cast-iron heat exchanger for durable thermal performance and stable combustion. Its atmospheric chimney-vent design requires a properly sized masonry or B-vent flue, making vent height, diameter, and draft performance critical installation checks. The included TACO-007 circulator supports consistent system flow across multi-zone layouts, while the no-tankless-opening configuration provides a sealed front section for improved efficiency and reduced service points. Technicians should verify manifold gas pressure, confirm proper rollout and spill-switch operation, match supply and return tapping sizes, and purge the hydronic loop thoroughly to prevent air binding and short-cycling in high-output applications.