Danfoss 003N0043 Thermostatic Radiator Valve Body - Straight, Nickel-Plated Brass, 1/2 inch

In a residential central heating system, precise temperature control in each room is essential for comfort and energy efficiency. The Danfoss 003N0043 is a thermostatic radiator valve body designed to pair with a Danfoss RA 2000 series thermostatic head (sold separately) to regulate the flow of heating water through a radiator. This straight-pattern valve body features a nickel-plated brass construction for durability and corrosion resistance. It is suitable for two-pipe heating systems and can be installed on either the flow or return side thanks to its bi-directional flow design. The valve body incorporates a pre-setting function that allows the installer to limit the maximum flow rate through the radiator, enabling hydraulic balancing of the system and preventing overheating in rooms with low heat demand. With a maximum operating pressure of 10 bar and a maximum flow temperature of 120°C, it is built to withstand typical central heating conditions. The valve body has a female threaded connection for the pipe (R 1/2") and a male threaded connection for the radiator (G 1/2" A), and it accepts thermostatic heads with an M23 x 1.5 connection. It complies with the EN 215 standard for thermostatic radiator valves. This product is ideal for plumbers, heating engineers, and DIY enthusiasts who are installing new radiators or upgrading existing manual valves to thermostatic control in homes, apartments, or small commercial buildings.

Key specifications

• Product type: Thermostatic radiator valve body (straight pattern)
• Pipe connection: Female thread R 1/2" (DN15)
• Radiator connection: Male thread G 1/2" A (DN15)
• Thermostatic head connection: M23 x 1.5
• Material: Nickel-plated brass
• Max. operating pressure: 10 bar (1 MPa)
• Max. differential pressure: 0.6 bar (60 kPa)
• Max. flow temperature: 120 °C
• Kv value (100% open): 0.7 m³/h
• Pre-setting function: Yes
• Flow direction: Bi-directional
• Medium: Water, water-glycol mixtures (up to 30%)
• Pressure class: PN10
• Compliance: EN 215

Why choose it

The Danfoss 003N0043 valve body offers reliable and precise control of radiator output when combined with a compatible thermostatic head. Its nickel-plated brass body ensures long service life and resistance to corrosion, while the pre-setting feature allows for simple hydraulic balancing, improving overall system efficiency and comfort. The bi-directional flow capability simplifies installation by eliminating the need to determine flow direction. With its standard connection sizes and compatibility with the widely used RA 2000 head series, it is a versatile choice for both new installations and retrofits.

Ideal use cases

• Residential central heating systems with radiators
• Two-pipe heating systems
• Retrofitting manual radiator valves to thermostatic control
• Hydronic balancing in multi-room installations
• Small commercial heating applications

Good to know

The thermostatic head is not included and must be purchased separately. The valve body is suitable for use with water or water-glycol mixtures up to 30% glycol. Installation should be carried out by a qualified professional in accordance with local regulations. The pre-setting can be adjusted using a special key (not included) to match the calculated flow rate for each radiator. The valve body is designed for use with Danfoss RA 2000 series thermostatic heads, but may also be compatible with other heads using the M23 x 1.5 connection (check compatibility before use).