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Thera-20 (Projecthead Series) Radiator thermostat

Thera-20 (Projecthead Series) Radiator thermostat

A Radiator Thermostat is installed onto a Thermostatic Radiator Valve Body (TRV body)...

Product Description

A Radiator Thermostat is installed onto a Thermostatic Radiator Valve Body (TRV body). The combination of both, the Thermostatic Radiator Valve (TRV), controls the room temperature by adjusting the flow of hot water through a radiator.

  • TRVs are installed in water-based heating systems on the supply or, less commonly on the return connection of radiators.
  • Radiator thermostats of this type fulfill the European Standard EN 215 when used with certified Honeywell TRV bodies.
  • Honeywell radiator thermostats with Honeywell (HW) M30 x 1.5 connection are suitable for all TRV body and radiator inserts with M30 x 1.5 connection and 11.5 mm closing dimension.
  • Radiator Thermostats of this type with snapring (DA) type connection are suitable for TRV bodies and valve inserts with Danfoss (RA) type compatible snap connection.

For warm water heating systems

  • on thermostatic radiator valve bodies, or
  • on compact radiator valve inserts.

Technical Properties

Approvals Models with M30 x 1.5 connection conform with the European standard EN 215
Sensing element internal
Temperature element liquid-filled
Closing dimension 11.5 mm
Setpoint limiting Yes
Cover cap Honeywell
Colour white
Additional Descriptions
  • With internal liquid-filled sensing element
  • Equipped with easy to use range stoppers
  • Modern ergonomical design

Certifications and Awards


Product Type EN215 certified
Body-head connection
Temp. setpoint range
Thera-2 with internal sensing element

M30 x 1,5 6 ... 28 oC -

M30 x 1,5 1 ... 26 oC

- RA-type 6 ... 28 oC -

- RA-type 1 ... 26 oC

Accessories and replacement parts


Image Description Product Type Downloads
Decoring for connection nut, white (RAL9016); 10 pair, 20 pieces TA1000A001  
Decoring for connection nut, Chrome; 10 pair, 20 pieces TA1000A002  
HZ-Adapter from M28 x 1.5 with 9.5 mm closing dimension to M30 x 1.5 with TA1010HZ01  
DA-Adapter from Danfoss snap connection RA to M30 x 1.5 TA1010DA01  
Theft-protection ring, white (RAL9016) TA6900A001