About the Resideo High/Low-Limit Aquastat Controller - L4006A1959
Bring Powerful, Worry-free Temperature Control to Your System!
The Resideo L4006A1959 aquastat controller is built for performance and ease of installation, making it a trusted choice for professionals working on hydronic heating systems. Its snap-acting Micro Switch™ ensures fast, reliable operation when temperature rises to the setpoint, while the external adjustment screw and visible control scale simplify calibration. In addition, this versatile controller supports both horizontal and vertical insertion of the sensing element, and can be installed directly into a piping system or used with a well. With options for strap-on or remote bulb mounting—including applications like duct or outdoor air sensing—it’s a flexible, field-proven solution that adjusts to real-world challenges.
Order your Resideo L4006A1959 aquastat controller from PlumbersStock today, and discover quality HVAC products—from cooling units to cozy fireplaces—all in one place.
