Temperature sensor Heiztechnik CVA304 for hot water cylinder (CWU) — immersion probe 5 m cable

Heiztechnik CVA304 is an immersion temperature sensor designed for domestic hot water (CWU) cylinders and storage tanks. The probe monitors water temperature to support control and safety functions in heating and hot water systems. With a 5 m cable, the sensor allows flexible placement and connection to controllers, boilers, or circulation systems where accurate temperature feedback is required.

Advantages

The immersion design enables direct sensing of tank water temperature for faster and more representative measurements compared with air sensors. The 5 m cable offers extended reach to connect the probe to nearby controllers or control cabinets without additional extension. The sensor is compatible with standard CWU system connections and provides stable temperature feedback suitable for regulation and safety cut-off functions.

Suitable for

• Monitoring temperature in domestic hot water cylinders and storage tanks
• Integration with heating system controllers and boilers for temperature regulation
• Use in circulation systems to control pumps or mixing valves
• Replacement or retrofit of existing immersion temperature probes in CWU installations

Key specifications

• Immersion probe design for direct water contact in tanks or cylinders
• 5 m cable length for flexible routing and connection
• Designed for use in domestic hot water (CWU) systems
• Compatible with standard control and boiler inputs requiring temperature feedback

How to use

Install the immersion probe into the designated pocket or well on the hot water cylinder, ensuring the sensing tip is positioned at the recommended depth for representative measurement. Route the 5 m cable to the control unit or boiler input, avoiding sharp bends and locations with mechanical strain. Connect the sensor leads to the appropriate temperature input on the controller or boiler according to the equipment wiring diagram, then secure cable entries to maintain a watertight installation where required. After connection, verify correct operation by comparing displayed temperature values with an independent thermometer or system diagnostics.

Usage recommendations

For reliable long-term operation, use the probe in the intended CWU environment and avoid exposure to chemicals or conditions outside the equipment’s specified operating range. Protect the cable from mechanical damage and secure termination points to prevent water ingress. During installation or replacement, follow the boiler or controller manufacturer’s wiring and grounding guidelines and perform a system test to confirm correct temperature sensing and control responses.