Ultra 230 Series High Efficiency Natural Gas Boiler, 230,000 BTU

Weil-McLain Ultra Series 230 – Condensing Gas Boiler (Model 383500736)

The Weil-McLain Ultra 230 is a high-efficiency, modulating condensing boiler designed for residential and light commercial hydronic heating systems. Utilizing a cast aluminum monobloc heat exchanger and a modulating burner system, this unit achieves up to 94.1% AFUE. It supports both natural gas and propane operation (conversion kit included) and is capable of consistent thermal performance across a wide range of load conditions.

System Design & Performance Highlights

• Input Capacity: 230,000 BTU/hr
• DOE Heating Capacity: 207,000 BTU/hr
• Net I=B=R Rating: 183,000 BTU/hr
• AFUE: 94.1% (DOE-certified)
• Modulation Ratio: 5:1
• Heat Exchanger: Cast aluminum, coated with nanotechnology for improved heat transfer and scale resistance
• Fuel Compatibility: Natural Gas (LP conversion kit included)

Construction & Service Features

• Cabinet Dimensions (H × W × D): 43-1/16” × 22-13/16” × 19-15/16”
• Water Connection: 1" NPT
• Gas Connection: 1/2" NPT
• Vent Size: 3” or 4” (PVC, CPVC, or Polypropylene)
• Relief Valve: 30 PSI ASME-certified (factory installed)
• Ignition: Direct spark ignition with integrated flame sensor
• Flue Gas Sensor: Built-in for overheat protection

Control System Integration

• Control Type: Ultra Control Module with digital display, user-defined parameters, fault code readout, and outdoor reset capability
• Pump Control: Includes logic for system pump and indirect DHW tank pump with priority
• Smart Sequencing: Lead-lag rotation supported when installed in multi-boiler arrays

Installation Requirements

The Ultra 230 is designed for professional installation. Proper combustion setup using a flue gas analyzer is required during commissioning. Boiler includes factory-wired controls, integral condensate trap, and mounting components. Vent and combustion air piping must be installed per Weil-McLain specifications and in compliance with local codes. System should be piped primary-secondary to ensure proper flow across the heat exchanger under all load conditions.

Vent lengths of up to 100 equivalent feet are supported depending on pipe diameter and configuration. The boiler’s design allows for direct venting through sidewall or roof terminations.

Certifications & Compliance

• ENERGY STAR® Certified
• CSA Certified (ANSI Z21.13 / CSA 4.9)
• ASME Section IV stamped heat exchanger
• Low NOx (<20 ppm), SCAQMD-compliant

Application Scope

Suitable for larger residential homes and light commercial buildings requiring high-capacity condensing boilers with flexible venting and fuel options. Can be paired with indirect-fired water heaters, zoned radiant systems, or baseboard loops. Designed for integration with building automation systems or standalone operation via onboard control platform.