Product Description
The Weil-McLain 381-359-365 is a CGI-7 Series 5 cast iron gas-fired hydronic water boiler built for residential and light commercial heating applications. This natural gas boiler delivers 141,000 BTU of output from a 190,000 BTU input, achieving an 84% thermal efficiency rating. The DOE heating capacity is rated at 162,000 BTU, and the IBR rating matches the output at 141,000 BTU. These figures make the CGI-7 a reliable choice for HVAC professionals sizing boilers for forced hot water heating systems in homes and smaller commercial buildings. The unit ships with a Taco 007 circulator pump pre-installed, streamlining the installation process and reducing field assembly time. Spark ignition provides dependable startup without a standing pilot flame, reducing gas consumption during standby periods. The power vent configuration allows flexible venting through a 3-inch vent connection, giving installers more placement options compared to natural draft units. The cast iron heat exchanger is the core of this boiler. Cast iron is a proven material in hydronic heating systems because it holds heat well, resists corrosion over time, and performs reliably through repeated heating and cooling cycles. Weil-McLain backs the heat exchanger with a 20-year warranty and covers parts for 2 years, reflecting confidence in the long-term durability of this design. The steel jacket is insulated to reduce standby heat loss and improve overall system efficiency. Water connections are sized at 1-1/4 inches, and the gas connection is 3/4 inches. The boiler operates on 120-volt power and includes a 30 psi pressure relief valve. The unit measures 28-3/8 inches tall, 22 inches wide, and 23-1/4 inches deep. Licensed HVAC technicians and plumbers working on hydronic heating retrofits or new installations will find the CGI-7 Series 5 a straightforward, well-supported product from a manufacturer with a long track record in cast iron boiler manufacturing. Installation, commissioning, and service must be performed by a licensed professional in accordance with local codes and manufacturer guidelines.
- 141,000 BTU output with 84% efficiency and a 162,000 BTU DOE rating for reliable hydronic heating performance
- Cast iron heat exchanger backed by a 20-year warranty for long-term durability in residential and light commercial systems
- Includes Taco 007 circulator pump and spark ignition; power vent design with 3-inch vent connection for flexible installation
Product Highlights
The Weil-McLain CGI-7 Series 5 combines a durable cast iron heat exchanger, factory-installed Taco 007 circulator, and spark ignition in a power vent natural gas boiler rated at 141,000 BTU output. It is a dependable option for licensed HVAC professionals installing or replacing hydronic heating equipment in residential and light commercial settings.
Product Information
Standard Information
-
Brand: WEIL-MCLAIN
-
Manufacturer Part Number: 381-359-365
Technical Specifications
-
Product Type: Boiler
-
Boiler Type: Standard
-
System Type: Hydronic (Water)
-
Application: Heating
-
Fuel Type: Natural Gas
-
Ignition Type: Spark Ignition
-
Vent Type: Power Vent
-
BTU Input: 190,000 BTU
-
BTU Output: 141,000 BTU
-
DOE Rating: 162,000 BTU
-
IBR Rating: 141,000 BTU
-
Efficiency: 84%
-
Voltage: 120V
-
Gas Connection: 3/4 inches
-
Water Connection: 1-1/4 inches
-
Vent Size: 3 inches
-
Pressure Relief: 30 psi
-
Height: 28-3/8 inches
-
Width: 22 inches
-
Depth: 23-1/4 inches
-
Warranty: 20 Year (Heat Exchanger) / 2 Year (Parts)
