Thermostatic Angle Set FERRO ZTV21 for Underfloor Heating with GT20 Valve Head, 1/2" Connection

FERRO ZTV21 thermostatic angle set for underfloor heating with GT20 valve head is a compact valve assembly designed for corner installation in underfloor heating manifolds and radiator connections. The kit combines a thermostatic valve body with a GT20 temperature-sensitive head to regulate water flow and maintain desired room temperature. The 1/2" connection size makes it compatible with common piping used in residential and light-commercial underfloor heating circuits, enabling precise control of supply to individual loops or radiators.

Advantages

The thermostatic angle design allows installation in tight spaces and on manifold outlets where a right-angle orientation is required. The GT20 valve head provides automatic, responsive temperature control without external power, reacting to ambient temperature changes to modulate flow. Built for compatibility with 1/2" connections, the set simplifies replacement or retrofit in existing systems and supports stable room climate by reducing temperature fluctuations.

Suitable for

• Individual underfloor heating loops in residential apartments and houses
• Light-commercial underfloor heating circuits where precise zone control is needed
• Retrofit or replacement of existing 1/2" corner-mounted thermostatic valves
• Connections between manifold outlets and heating circuits requiring angle fittings

Key specifications

• Valve type: Thermostatic angle valve assembly with temperature-sensitive head
• Actuator: GT20 thermostatic head (mechanical, temperature-responsive)
• Connection size: 1/2" thread compatible with standard plumbing fittings
• Installation orientation: Corner / angle mounting suitable for manifold outlets
• Control function: Automatic modulation of flow to maintain set room temperature

How to use

Install the thermostatic angle set on the supply or return outlet of the underfloor heating manifold or radiator connection using appropriate 1/2" fittings and sealing. Fit the GT20 valve head onto the valve spindle and set the desired temperature using the head's adjustment scale. Ensure the valve body is oriented correctly for corner mounting and that piping is supported to prevent stress on the connections. Once installed, the GT20 head will modulate the valve automatically in response to ambient temperature changes.

Usage recommendations

For optimal performance, purge the heating circuit to remove air before commissioning and check for proper flow through the controlled loop. Avoid using aggressive sealing compounds on the valve spindle and verify compatibility with system water treatment. Periodic inspection and gentle cleaning of the thermostatic head will help maintain accurate temperature control.