Thermostatic Radiator Valve Set CALEFFI KIT4221402 1/2" Simple Thermostatic Kit

CALEFFI KIT4221402 thermostatic radiator valve set with 1/2" connections is a compact, factory-matched kit intended for direct control of radiator flow in residential and light commercial heating systems. The set comprises a thermostatic valve and the essential components required to enable automatic temperature regulation at the radiator, simplifying installation and ensuring a consistent room climate when connected to a central heating system.

Advantages

The thermostatic kit provides automatic regulation of radiator flow according to room temperature, reducing manual adjustments. Its compact 1/2" connection size fits common radiator inlets and supports straightforward replacement or retrofit. The matched components are designed to ensure compatibility and reliable operation within typical hot-water heating circuits, offering accurate control and stable performance over time.

Suitable for

• Domestic radiators in single-family homes and apartments
• Light commercial radiators in offices or small retail spaces
• Retrofit projects where a compact 1/2" thermostatic solution is required
• Zones requiring independent room temperature control

Key specifications

• Connection size: 1/2" suitable for standard radiator inlets
• Type: thermostatic radiator valve kit with matched components
• Function: automatic temperature control via thermostatic valve
• Application: hot-water central heating systems for room-level regulation
• Form factor: compact kit designed for direct radiator mounting

How to use

Install the thermostatic valve set at the radiator inlet according to the radiator manufacturer’s and local plumbing codes. Ensure the system is depressurized and drained as required before replacing or fitting the valve. Connect the 1/2" fittings securely, restore system water and pressure, then set the thermostat element to the desired room temperature. Check for leaks and verify that the valve modulates flow as the room temperature changes.

Usage recommendations

For reliable operation, commission the valve after installation by allowing the heating system to reach normal operating temperature and observing several heating/cooling cycles. Avoid exposing the thermostat sensor to direct drafts or heat sources that could affect room-temperature sensing. Periodic inspection during routine system maintenance will help maintain accurate control and prolong service life.