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Weil-McLain CGi-3 Series 4 58,000 BTU Cast Iron Natural Gas Boiler - Main Image

Weil-McLain CGi Series 5 Boiler 381359364 Gas-Fired Cast Iron 84% AFUE

by Weil-McLain
SKU
Save $1,145.23 Save $1,145.23
$5,726.34
$5,726.34 - $5,726.34
$5,726.34
$4,581.11
$4,581.11 - $4,581.11
$4,581.11

The Weil-McLain CGi™ Series 5 (Model 381-359-364) is a premium cast-iron, gas-fired hot-water boiler engineered for long-lasting comfort and efficiency. Designed for both residential and light commercial installations, this unit offers induced-draft performance, an 84% AFUE efficiency rating, and a durable cast-iron heat exchanger that ensures reliable operation for decades.

This CGi model includes Unity-CI text-based controls, a built-in low water cutoff, and a fully insulated jacket for improved thermal performance. With flexible venting, quiet operation, and proven reliability from Weil-McLain — North America’s most trusted boiler manufacturer — this system is an excellent choice for hydronic heating systems.

🔥 Key Features

  • 84% AFUE Efficiency for dependable heating performance.

  • Unity-CI electronic control with digital text display for simple setup & diagnostics.

  • Induced-draft design — improves venting reliability and system stability.

  • Integrated low-water cutoff system for added safety.

  • Heavy-duty cast-iron heat exchanger designed for long service life.

  • Flexible venting: natural draft or direct exhaust options.

  • Compatible with ECO-HP heat pump systems (Weil-McLain hybrid-ready).

  • Quiet operation with stainless-steel burners.

  • Tested for 50 PSI working pressure (CSA certified).

  • Made in the USA heat exchanger.

Upgrade your home or light commercial space with the dependable performance of the Weil-McLain CGi Series Gas Boiler. Below are the key technical specifications for model 381359364:

Performance & Application

  • AFUE Efficiency: 84.00%

  • BTU Input / Heat Rating: 158,000 BTU/h

  • Application: Residential & Commercial

  • Boiler Type: Gas, Hot Water

  • Fuel Type: Natural Gas

  • Media: Hot Water (Hydronic)

Construction & Design

  • Heat Exchanger: Heavy-duty Cast Iron

  • Condensing: No (Standard Efficiency)

  • Vent Type: Natural Draft

  • Water Capacity: 3.3 gallons

  • Collection: CGi Series

Electrical

  • Voltage: 120V

  • Phase: Single Phase

Dimensions

  • Width: 19 in

  • Height: 28-1/8 in

  • Depth: 23-1/4 in

Compliance & Identification