Honeywell L8148E1216 Aquastat Relay Boiler Control for Hydronic Heating Systems

Honeywell · Relays, Contactors & Switches

Description  The L8148E1216 is an immersion-type high-limit aquastat relay that provides essential boiler safety by monitoring water temperature and controlling burner and circulator circuits. It operates on 120VAC and is designed for precise and reliable temperature regulation in hydronic heating systems.     Technical Specifications  Condition New/Never Used Surplus Brand Honeywell Category Controls & Indicators Part Number L8148E1216 Subcategory Temperature/Process Control Product Type Aquastat Relay Boiler Control Function High-limit boiler temperature control with relay switching Application Forced hydronic heating systems Operating Voltage 120 VAC Frequency 60 Hz Thermostat Compatibility 24 VAC thermostat, 0.2 A anticipator Temperature Range 140–240°F (model dependent) Maximum Pressure 255 psi immersion well Mounting Horizontal or vertical immersion well Certifications UL Listed, CSA Certified Weight 3.65 lb (1.66 kg)        Information About L8148E1216 The L8148E1216, now discontinued by the manufacturer, is part of Honeywell's L8148E series of immersion-type relay controllers. It is designed for integration with forced hydronic systems and works with a 24VAC thermostat (with 0.2A heat anticipator). The relay includes high-limit protection that shuts off the burner when water temperature exceeds setpoint, while allowing the circulator to keep running if a thermostat call persists. The unit shares common features with related models in the series, such as options for remote low-limit control and a specific plug for vent damper systems. Rated for industrial-grade use, it can be mounted either horizontally or vertically and supports installation with well adapters and heat-conductive compounds.  Key Features: Immersion-Type Controller: Fits into boiler-compatible immersion well for accurate temperature sensing. High-Limit Protection: Automatically interrupts burner circuit when water exceeds set threshold; circulator continues if thermostat remains active. Thermostat Compatibility: Designed to work with 24VAC thermostats using a 0.2A heat anticipator. Remote Input Terminal: Includes provision for low-limit sensor or zone valve wiring. Vent Damper Plug Option: E-model supports plug-in to Honeywell vent dampers. Flexible Mounting: Supports both horizontal and vertical orientation; includes well adapters. Robust Construction: Rated for up to 255 psi pressure and ambient temperatures up to 150 °F depending on load. Discontinued Model: No longer produced, with surplus items still on the market under warranty. Thermostat Heat Anticipator: Factory set at 0.2A to optimize accuracy. Temperature Scale Range: Typically between 140–240 °F with a fixed differential. The L8148E1216 delivers reliable and customized temperature control necessary for safe hydronic heating operations.

Brand: Honeywell · Category: Relays, Contactors & Switches

Key features

• Immersion-Type Controller: Fits into boiler-compatible immersion well for accurate temperature sensing.
• High-Limit Protection: Automatically interrupts burner circuit when water exceeds set threshold; circulator continues if thermostat remains active.
• Thermostat Compatibility: Designed to work with 24VAC thermostats using a 0.2A heat anticipator.
• Remote Input Terminal: Includes provision for low-limit sensor or zone valve wiring.
• Vent Damper Plug Option: E-model supports plug-in to Honeywell vent dampers.
• Flexible Mounting: Supports both horizontal and vertical orientation; includes well adapters.
• Robust Construction: Rated for up to 255 psi pressure and ambient temperatures up to 150 °F depending on load.
• Discontinued Model: No longer produced, with surplus items still on the market under warranty.
• Thermostat Heat Anticipator: Factory set at 0.2A to optimize accuracy.
• Temperature Scale Range: Typically between 140–240 °F with a fixed differential.

Specifications

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