Hydrotherm 02-2700 Aquastat

The Hydrotherm 02-2700 High Limit Aquastat is a professional-grade, OEM immersion-type temperature controller engineered for precision safety in hydronic boiler systems. This L4080B series control is a critical safety component that monitors boiler water temperature and automatically interrupts the burner circuit when the high-limit setpoint is reached. Designed for direct replacement in Hydrotherm Series 8H boilers and other high-demand hydronic equipment, this immersion aquastat ensures system integrity by preventing dangerous overheating conditions. The unit features an adjustable dial range, typically covering 140?F to 220?F (or 100?F to 200?F depending on the specific Honeywell L4080B sub-model conversion), with a factory-set 8?F differential. This boiler temperature control utilizes a liquid-filled sensing element and a diaphragm-actuated snap switch for reliable, millivolt or line-voltage compatible operation. As an OEM boiler part, it provides a direct mechanical fit for 3-inch insertion wells, facilitating accurate thermal response and streamlined heating system replacement during field service.

Key Benefits:

• Universal Compatibility: Direct OEM replacement for the Hydrotherm 02-2700 and Honeywell L4080B1212, ensuring drop-in installation on Hydrotherm Series 8H units.
• Hydronic Safety: Functions as a dedicated high limit aquastat to break power to the burner, protecting residential and commercial piping from thermal stress.
• Precision Calibration: Features an adjustable setpoint with a tight 8?F differential to minimize temperature overshoot and maintain high system efficiency.
• Flexible Electrical Ratings: Rated for line voltage (8A at 120V) or low voltage (0.25A at 12VDC) applications, making it a versatile hydronic boiler safety control.

Common Questions:

How do I set the high limit on the 02-2700?
Rotate the notched adjustment wheel until the desired temperature aligns with the arrowhead indicator on the switch housing. We recommend following the boiler manufacturer?s specific temperature requirements.

Does this unit include the immersion well?
The Hydrotherm 02-2700 is designed to mount into existing standard immersion wells. If your current well is damaged or requires a different insertion depth, a separate 1/2-inch or 3/4-inch NPT well may be required.

What is the difference between this and a triple aquastat?
This is a single-function high limit control (L4080B). Unlike triple aquastats, which manage circulator and low-limit functions, this unit is dedicated solely to safety-limit burner interruption on temperature rise.

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.