Resideo by Honeywell T104B1038 High Capacity Thermostatic Radiator Actuator with Remote Sensor

The Resideo by Honeywell T104B1038 is a high-capacity thermostatic radiator actuator designed to provide precise, automatic temperature control in two-pipe hydronic heating systems. This unit modulates hot water or steam flow through free-standing radiators, convectors, and heating units requiring higher capacity control.

This model features a remote-mounted controller with a combined setpoint dial and temperature sensor that installs on the wall. The sensor connects to the valve-mounted actuator via a 6-foot 8-inch capillary tube, allowing flexible installation and accurate room temperature monitoring away from the heat source. The adjustable setpoint range covers 48°F to 79°F (some sources indicate up to 83°F), delivering consistent comfort while preventing under-heating and overheating.

Key Features:

• High-capacity design engineered for North American heating system requirements
• Remote wall-mounted sensor and setpoint controller with 6'8" capillary tube
• Compatible with V110 valve bodies with 1-19/32" (40mm) collar diameter
• Nickel-plated bronze casted body with cartridge insert for easy servicing
• EPDM valve seat disc ensures tight shutoff on steam and hot water systems
• Requires no electrical connections—fully mechanical operation
• All working parts replaceable while valve remains in-line under pressure
• Meets ASHRAE Standard 102-1989

The T104B1038 actuator continuously monitors and adjusts room temperature, providing reliable zone control for residential and commercial hydronic heating applications. The robust construction and serviceable design ensure long-term performance and easy maintenance.