
Resideo L4006H1004 Aquastat Controller
The Resideo L4006H1004 Aquastat Controller is a high-limit immersion device engineered for precision temperature regulation in hydronic systems. Designed for professionals requiring a reliable manual reset boiler control, this unit features a 3/8" x 2 7/8" copper bulb sensing element and single-pole single-throw (SPST) contacts that break on temperature rise. This high limit aquastat provides critical safety for pressurized vessels and boilers, ensuring the system remains within safe operating parameters. Its versatility is bolstered by a 100°F to 240°F operating range and the flexibility of horizontal or vertical mounting using the included strap-on mounting bracket.
For contractors servicing Honeywell L4006H replacement jobs, this unit is a drop-in solution for applications involving liquid temperature limiting. The 1 1/2" capillary length and factory-set stop at 240°F facilitate rapid installation on existing pipes or immersion wells. By utilizing this aquastat temperature controller, technicians ensure the protection of domestic hot water and hydronic heating systems against overheating through robust mechanical switching and dependable thermal response.
- Universal Mounting: Includes a bracket for strap-on mounting, allowing for easy retrofit on various pipe sizes without draining the system.
- Integrated Safety: The manual reset feature ensures that a technician must inspect the system if the high limit is reached, preventing cycling under fault conditions.
- High-Capacity Contacts: Rated for line voltage applications, the SPST switch provides a reliable break for burner or circulator circuits.
- Sensing Precision: The copper bulb sensing element offers rapid thermal transfer for accurate response to liquid temperature fluctuations.
Common Resideo L4006H1004 Questions:
Can the L4006H1004 be used as a low-limit controller?
No, this specific model is a high-limit control with contacts that break on temperature rise and requires a manual reset. It is not designed for circulator control or low-limit applications where "make on rise" or automatic reset is required.
Does this unit require an immersion well?
While it can be used with an immersion well (sold separately), this model includes a bracket for strap-on mounting, making it ideal for applications where an internal bulb insertion is not feasible.
What is the purpose of the manual reset on this Aquastat?
The manual reset acts as a safety lockout. If the temperature exceeds the 240°F limit or your set point, the controller breaks the circuit and will not re-engage until the reset button is physically depressed by a technician.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Original: $259.52
-65%$259.52
$90.83Resideo L4006H1004 Aquastat Controller
The Resideo L4006H1004 Aquastat Controller is a high-limit immersion device engineered for precision temperature regulation in hydronic systems. Designed for professionals requiring a reliable manual reset boiler control, this unit features a 3/8" x 2 7/8" copper bulb sensing element and single-pole single-throw (SPST) contacts that break on temperature rise. This high limit aquastat provides critical safety for pressurized vessels and boilers, ensuring the system remains within safe operating parameters. Its versatility is bolstered by a 100°F to 240°F operating range and the flexibility of horizontal or vertical mounting using the included strap-on mounting bracket.
For contractors servicing Honeywell L4006H replacement jobs, this unit is a drop-in solution for applications involving liquid temperature limiting. The 1 1/2" capillary length and factory-set stop at 240°F facilitate rapid installation on existing pipes or immersion wells. By utilizing this aquastat temperature controller, technicians ensure the protection of domestic hot water and hydronic heating systems against overheating through robust mechanical switching and dependable thermal response.
- Universal Mounting: Includes a bracket for strap-on mounting, allowing for easy retrofit on various pipe sizes without draining the system.
- Integrated Safety: The manual reset feature ensures that a technician must inspect the system if the high limit is reached, preventing cycling under fault conditions.
- High-Capacity Contacts: Rated for line voltage applications, the SPST switch provides a reliable break for burner or circulator circuits.
- Sensing Precision: The copper bulb sensing element offers rapid thermal transfer for accurate response to liquid temperature fluctuations.
Common Resideo L4006H1004 Questions:
Can the L4006H1004 be used as a low-limit controller?
No, this specific model is a high-limit control with contacts that break on temperature rise and requires a manual reset. It is not designed for circulator control or low-limit applications where "make on rise" or automatic reset is required.
Does this unit require an immersion well?
While it can be used with an immersion well (sold separately), this model includes a bracket for strap-on mounting, making it ideal for applications where an internal bulb insertion is not feasible.
What is the purpose of the manual reset on this Aquastat?
The manual reset acts as a safety lockout. If the temperature exceeds the 240°F limit or your set point, the controller breaks the circuit and will not re-engage until the reset button is physically depressed by a technician.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
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Description
The Resideo L4006H1004 Aquastat Controller is a high-limit immersion device engineered for precision temperature regulation in hydronic systems. Designed for professionals requiring a reliable manual reset boiler control, this unit features a 3/8" x 2 7/8" copper bulb sensing element and single-pole single-throw (SPST) contacts that break on temperature rise. This high limit aquastat provides critical safety for pressurized vessels and boilers, ensuring the system remains within safe operating parameters. Its versatility is bolstered by a 100°F to 240°F operating range and the flexibility of horizontal or vertical mounting using the included strap-on mounting bracket.
For contractors servicing Honeywell L4006H replacement jobs, this unit is a drop-in solution for applications involving liquid temperature limiting. The 1 1/2" capillary length and factory-set stop at 240°F facilitate rapid installation on existing pipes or immersion wells. By utilizing this aquastat temperature controller, technicians ensure the protection of domestic hot water and hydronic heating systems against overheating through robust mechanical switching and dependable thermal response.
- Universal Mounting: Includes a bracket for strap-on mounting, allowing for easy retrofit on various pipe sizes without draining the system.
- Integrated Safety: The manual reset feature ensures that a technician must inspect the system if the high limit is reached, preventing cycling under fault conditions.
- High-Capacity Contacts: Rated for line voltage applications, the SPST switch provides a reliable break for burner or circulator circuits.
- Sensing Precision: The copper bulb sensing element offers rapid thermal transfer for accurate response to liquid temperature fluctuations.
Common Resideo L4006H1004 Questions:
Can the L4006H1004 be used as a low-limit controller?
No, this specific model is a high-limit control with contacts that break on temperature rise and requires a manual reset. It is not designed for circulator control or low-limit applications where "make on rise" or automatic reset is required.
Does this unit require an immersion well?
While it can be used with an immersion well (sold separately), this model includes a bracket for strap-on mounting, making it ideal for applications where an internal bulb insertion is not feasible.
What is the purpose of the manual reset on this Aquastat?
The manual reset acts as a safety lockout. If the temperature exceeds the 240°F limit or your set point, the controller breaks the circuit and will not re-engage until the reset button is physically depressed by a technician.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.












