Danfoss 065B-8900 Regulator

The Danfoss 065B-8900 Regulator is a specialized 3/4" NPT ATA thermostatic draft regulator engineered for precision air supply control in solid fuel boilers and multi-fuel heating systems. As a veteran-grade thermostatic damper control, this unit utilizes an internal wax element to automatically adjust the combustion air flap based on water temperature, operating within a reliable range of 95–203°F (35–95°C). The Danfoss 065B8900 features a rugged construction with a 2-inch (55 mm) stroke length and a 63-inch (1.6 m) chain, ensuring high-accuracy draft modulation without the need for external power. Designed to prevent overheating and optimize fuel consumption, this ATA draft regulator is the standard for contractors looking for a drop-in HVAC replacement regulator that maintains consistent boiler temperatures and prevents stack loss.

• Automatic Combustion Control: Precisely modulates air intake to maintain setpoint temperatures, reducing manual adjustments and call-backs.
• Universal 3/4" NPT Connection: Features standard threading for seamless integration into existing boiler tapping points.
• High-Temperature Durability: Engineered to withstand the rigors of solid fuel environments with a wide 95–203°F thermal range.
• Heavy-Duty Chain Assembly: Included 1.6m chain provides ample length for complex damper door configurations.
• Internal Wax Element: Provides reliable, power-free actuation for fail-safe operation in remote or off-grid heating installations.

What is the maximum operating temperature for this regulator?
The Danfoss 065B8900 is rated for a control range up to 203°F, though the body and element are designed to handle typical boiler manifold temperatures found in residential and light commercial hydronic systems.

Can this be mounted in any orientation?
For optimal performance and to prevent air trapping around the sensing element, it is recommended to install the regulator horizontally or vertically as specified by the boiler manufacturer’s port location.

Is this compatible with wood or coal boilers?
Yes, this ATA thermostatic draft regulator is specifically designed for solid fuel applications where varying draft conditions require constant mechanical compensation to maintain safe operating limits.

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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.