This Weil-McLain section assembly is designed for use with CGa and CGi8 Series 2 boilers. The assembly includes an environmental sensor (Env) to monitor the surrounding conditions and adjust the boiler's operation accordingly. The section assembly, also known as SEC ASSY, is a critical component of the boiler system, facilitating the transfer of heat from the burner to the water in the boiler. It is constructed from durable materials to withstand high temperatures and pressures. The inclusion of an environmental sensor enhances the efficiency and safety of the boiler system by ensuring optimal operating conditions are maintained.