Flue gas thermostat


  • On/off switch based on flue gas temperature.
  • Switch temperature between 20°C and 240°C.

The series CTF150 is typically used for on/off control of circulation pumps and load units. The flue gas thermostat consists of a temperature probe connected to the switch unit. The switch is used to control the electrical supply to a circulation pump or a load unit with an integrated circulation pump.

The series CTF150 can also be used in heat generator plants with multiple heat generators to change over from solid fuel to oil- or gas boilers.

The temperature probe can be mounted on the outside of the flue gas pipe, or inside the pipe using the immersion pocket series CTF851. The switch unit is prepared for easy wall mounting.

Product range


CTF150 front_A-01.png
CTF150 side_A-01.png
Art.no. Reference Switch temp. range [°C] max. temperature probe [°C] A [mm] B [mm] C [mm] Weight [kg]
56020100 CTF151 20 - 240 500 53 120 70 0,2
Installation support

Installation example

Installation example


Technical data

Technical data

Enclosure rating: IP54 (EN 60529)
Hysteresis: 7% of the scale range
Contact rating: N/C contact: max. 16(2,5)A 230 VAC;
N/O contact: max. 6,3(2,5)A 230 VAC;
min. 24V AC/DC, 100mA
Weight: 0,2 kg
Temperature probe: Ø6 mm x 96 mm
Temperature probe line: Ø1,5 mm x 1500 mm
Immersion pocket: Ø8 mm x 0,75 mm, length 100 mm
Storage temperature: -30°C to +50°C
Usage temperature: 0°C to +50°C
Material, Case lid: Plastic ABS
Material, Housing: Plastic PA (inforced)
Material, Immersion pocket: Stainless steel (CrNi, 1.4571)
Material, Temperature probe: Stainless steel (CrNi, 1.4301)
Material, Temperature probe insulation: Plastic PVC hose
Acc. to EN 14597


LVD 2014/35/EU
EMC 2014/30/EU
SI 2016 No. 1101
SI 2016 No. 1091


Please see Installation instruction
Accessories and spare parts


Art No. Reference Designation
56020200 56020200 CTF851 ESBE CTF851 Immersion pocket
Download area

Download area

Type Preview Download
Data Sheet CTF150 download
Installation instruction CTF150 download
Certificate Declaration of Conformity, CTF150 download
Certificate Declaration of Conformity UKCA, CTF150 download
Certificate EAC certificate (RU), CTF150 download
Image CTF150, high res download
2D Image CTF150 download


Efficient storage tank loading with available safety equipment.