Honeywell Home 503 Closed-Circuit Fixed Temperature 135° Heat Detector

Protect assets and people with dependable heat detection where smoke detectors may not suffice. The Honeywell Home 503 fixed-temperature heat detector delivers reliable 135°F activation in a closed-circuit design, providing consistent thermal monitoring for ceilings up to 400'. Its ceiling-mount form factor makes it ideal for application in attics, boiler rooms, kitchens and mechanical spaces where smoke detection is impractical.

Designed for easy integration into existing security and fire monitoring systems, the 503 supports straightforward wiring and dependable alarm signaling to your control panels and surveillance platforms. Contractors and facility managers will value a low-maintenance detector that reduces nuisance alerts while keeping critical areas under continuous thermal surveillance. Built by Resideo under the trusted Honeywell Home brand, the unit also meets environmental WEEE standards for responsible disposal.

For reliable, code-conscious heat detection in residential and light-commercial installations, specify the Honeywell Home 503. Order now or contact your sales representative to add this detector to your fire protection and security strategy.

• Detects dangerous heat early at a 135°F threshold to limit property damage and downtime
• Closed‑circuit design for dependable alarm signaling and easy integration with existing monitoring panels
• Ceiling‑mount form factor simplifies installation in attics, mechanical rooms and other hard-to-reach areas
• Coverage up to 400' gives flexible placement options for residential and light commercial systems
• Robust Honeywell Home build with WEEE compliance for long-term reliability and environmental responsibility