Thermostatic radiator valve DANFOSS Redia M30x1.5 015G5121, 1/2 inch connection

The DANFOSS Redia thermostatic radiator valve M30x1.5 with 1/2" connection is designed to regulate flow to hot-water radiators and maintain set room temperatures automatically. It is compatible with standard thermostatic heads that fit the M30x1.5 spindle and connects to radiator bodies or return pipes with a 1/2" threaded fitting. The valve body and internal mechanism provide a reliable means of modulating water flow according to the head’s setpoint, supporting automatic balancing and stable room climate control in residential and commercial heating installations.

Advantages

This thermostatic valve offers precise temperature control through a proven mechanical sensing and modulation system, enabling consistent room temperature without manual balancing. The 1/2" connection simplifies replacement of existing radiator valves and supports common radiator installation layouts. Durable construction and compatibility with standard M30x1.5 thermostatic heads ensure straightforward maintenance and long-term operation. The valve contributes to improved energy efficiency by reducing overheating and allowing individual radiator adjustments.

Suitable for

• Domestic hot-water radiator systems in apartments and houses
• Small commercial heating zones and individual rooms
• Replacement of existing M30x1.5 radiator valves with 1/2" connections
• Systems requiring automatic balancing and per-radiator temperature control

Key specifications

• Connection type: 1/2" threaded radiator connection
• Spindle thread for thermostatic head: M30x1.5
• Function: thermostatic flow control for hot-water radiators
• Application medium: heating water (hot-water heating systems)
• Mounting: direct connection to radiator valve inlet or return
• Control: compatible with manual and programmable thermostatic heads

How to use

Install the valve in place of an existing radiator valve or during new radiator installation, ensuring the 1/2" threaded connection is sealed and tightened according to installation torque recommendations. Fit a compatible M30x1.5 thermostatic head onto the valve spindle to set the desired room temperature. The valve operates automatically: as the thermostatic head senses temperature changes, it modulates the valve opening to regulate flow and maintain the setpoint. Periodic inspection during routine heating system maintenance is advised to check for leaks and ensure correct operation of the head and spindle.

Recommendations

Use the valve with thermostatic heads rated for radiator applications and avoid exposure to aggressive fluids. During system filling and flushing, protect the valve from debris; consider installing a filter or dirt separator upstream. For best energy performance, balance the heating system and set thermostatic heads according to room usage and occupancy patterns.