

L8148E1257 | Honeywell High Limit Aquastat Relay 140–240°F with Vent Damper Connection
- Regular price
- $559.00
- Sale price
- $559.00
- Regular price
-
Couldn't load pickup availability
Do you need help?

Product Description P/N: L8148E1257
Description
The Honeywell L8148E1257 High Limit Aquastat Relay provides precise high-limit temperature control for hydronic heating systems. Designed for vertical mounting, it features a 140–240°F temperature range and includes a vent damper connection, ensuring efficient burner operation and reliable system safety.
Technical Specifications
Condition | New/Never Used Surplus |
Brand | Honeywell |
Category | HVAC Controls |
Part Number | L8148E1257 |
Subcategory | Aquastat Relay |
Type | High Limit Aquastat Relay |
Temperature Range | 140°F to 240°F |
Control Function | High Limit (Burner Circuit Only) |
Mounting Type | Vertical Case |
Power Supply | 120 VAC |
Thermostat Requirement | 24 VAC Thermostat (0.2A Anticipator Setting) |
Transformer Included | Yes (Integral Transformer for 24V Control Circuit) |
Accessory Terminals | For Remote Low Limit Controller |
Vent Damper Connection | Yes |
Switch Type | SPST Relay |
Control Circuit Voltage | 24 VAC |
Application | Hydronic Heating Systems (Oil or Gas Boilers) |
Case Material | Metal Enclosure |
Electrical Rating | Designed for Line and Low Voltage Circuits |
Operation Mode | Opens Burner Circuit at High Limit |
Safety Feature | Automatic Reset on Temperature Drop |
Mounting Orientation | Vertical Only |
Dimensions (Approx.) | Standard Honeywell Aquastat Relay Form Factor |
Weight | 4.00 lbs |
Information About L8148E1257
The L8148E1257 belongs to Honeywell’s trusted line of Aquastat relays designed to regulate boiler temperature and burner control in hydronic heating systems. It serves as a high-limit controller, opening the burner circuit when water temperature exceeds the set limit. This model operates within a 140°F–240°F range and includes integrated terminals for connecting a vent damper and optional remote low-limit controller. The vertical-mount metal case design provides durability and efficient heat dissipation, while its integral transformer powers the 24 VAC control circuit. Engineered for reliability, it ensures precise system control, reduced cycling, and protection from overheating.
Key Features:
- High Limit Temperature Control: Monitors and interrupts burner operation when water temperature exceeds set parameters.
- Wide Adjustable Range: Operates from 140°F to 240°F for flexibility in hydronic heating systems.
- Integrated Transformer: Supplies 24 VAC power to thermostat and control circuitry.
- Vent Damper Connection: Supports automatic vent damper systems for improved energy efficiency and safety.
- Vertical Mount Configuration: Designed for easy installation and optimal thermal response.
- Accessory Terminals: Allows connection of optional remote low limit controller for enhanced system functionality.
- Durable Metal Enclosure: Provides long-term protection and stable operation under high temperature conditions.
- Reliable Safety Function: High limit relay opens the burner circuit only, preventing overheating while maintaining system stability.
The L8148E1257 delivers the reliability and precision required for safe, efficient operation of hydronic boiler systems and temperature-based burner control.
Description
The Honeywell L8148E1257 High Limit Aquastat Relay provides precise high-limit temperature control for hydronic heating systems. Designed for vertical mounting, it features a 140–240°F temperature range and includes a vent damper connection, ensuring efficient burner operation and reliable system safety.
Technical Specifications
Condition | New/Never Used Surplus |
Brand | Honeywell |
Category | HVAC Controls |
Part Number | L8148E1257 |
Subcategory | Aquastat Relay |
Type | High Limit Aquastat Relay |
Temperature Range | 140°F to 240°F |
Control Function | High Limit (Burner Circuit Only) |
Mounting Type | Vertical Case |
Power Supply | 120 VAC |
Thermostat Requirement | 24 VAC Thermostat (0.2A Anticipator Setting) |
Transformer Included | Yes (Integral Transformer for 24V Control Circuit) |
Accessory Terminals | For Remote Low Limit Controller |
Vent Damper Connection | Yes |
Switch Type | SPST Relay |
Control Circuit Voltage | 24 VAC |
Application | Hydronic Heating Systems (Oil or Gas Boilers) |
Case Material | Metal Enclosure |
Electrical Rating | Designed for Line and Low Voltage Circuits |
Operation Mode | Opens Burner Circuit at High Limit |
Safety Feature | Automatic Reset on Temperature Drop |
Mounting Orientation | Vertical Only |
Dimensions (Approx.) | Standard Honeywell Aquastat Relay Form Factor |
Weight | 4.00 lbs |
Information About L8148E1257
The L8148E1257 belongs to Honeywell’s trusted line of Aquastat relays designed to regulate boiler temperature and burner control in hydronic heating systems. It serves as a high-limit controller, opening the burner circuit when water temperature exceeds the set limit. This model operates within a 140°F–240°F range and includes integrated terminals for connecting a vent damper and optional remote low-limit controller. The vertical-mount metal case design provides durability and efficient heat dissipation, while its integral transformer powers the 24 VAC control circuit. Engineered for reliability, it ensures precise system control, reduced cycling, and protection from overheating.
Key Features:
- High Limit Temperature Control: Monitors and interrupts burner operation when water temperature exceeds set parameters.
- Wide Adjustable Range: Operates from 140°F to 240°F for flexibility in hydronic heating systems.
- Integrated Transformer: Supplies 24 VAC power to thermostat and control circuitry.
- Vent Damper Connection: Supports automatic vent damper systems for improved energy efficiency and safety.
- Vertical Mount Configuration: Designed for easy installation and optimal thermal response.
- Accessory Terminals: Allows connection of optional remote low limit controller for enhanced system functionality.
- Durable Metal Enclosure: Provides long-term protection and stable operation under high temperature conditions.
- Reliable Safety Function: High limit relay opens the burner circuit only, preventing overheating while maintaining system stability.
The L8148E1257 delivers the reliability and precision required for safe, efficient operation of hydronic boiler systems and temperature-based burner control.
