Resideo l8124e1016/u Triple Aquastat Relay 24V

Product Description

The RESIDEO l8124e1016/u is a triple aquastat relay designed for hydronic heating systems. It combines high-limit, low-limit, and circulator relay functions into a single control, reducing the number of individual components needed in a boiler control panel. The high-limit differential is fixed, while the low-limit differential is field-adjustable, giving the installing technician control over system response. Operating at 24 volts, this aquastat is well suited for residential and light commercial hot water heating applications where precise boiler water temperature management is required.

This control is used in forced hot water heating systems where a boiler requires integrated high-limit protection, low-limit enforcement, and circulator relay switching. Typical installations involve mounting directly on the boiler aquastat well or immersion well. HVAC technicians and plumbers install this control during new boiler commissioning or as a direct replacement for failed or obsolete aquastat relay assemblies in existing systems.

Key Features

• Triple-function control: high-limit, low-limit, and circulator relay in one housing
• 24-volt control circuit operation
• Adjustable low-limit differential for field-tuned system response
• Fixed high-limit differential for consistent overheat protection
• Consolidates multiple controls into a single boiler-mounted unit

Compatibility

Designed as an OEM-style replacement aquastat relay for residential and light commercial hot water boiler systems requiring a triple-function immersion-mounted control.

Installation Notes

Installation should be performed by a licensed HVAC technician or plumber familiar with hydronic heating systems and applicable codes including the IFGC and IPC. Shut down boiler power and allow system water to cool before removing or installing the aquastat well assembly. Verify the immersion well diameter and depth are compatible with the control before mounting. Follow local codes for low-voltage wiring connections to the thermostat and zone controls.

Technical Specifications

• Control Voltage: 24 volts
• High Limit Differential: Fixed
• Low Limit Differential: Adjustable
• Function: Triple Aquastat Relay

Standard Information

• Brand: RESIDEO
• Manufacturer Part Number: l8124e1016/u