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Boiler Temperature Sensors

For gas boiler temperature control, a very fast thermal response is usually required. This is to ensure accurate temperature control of the hot water to help provide sufficient quantities, maximise boiler efficiency and also avoid the possibility of scalding.

ATC Semitec stock a number of immersion and clip-on temperature sensors where the NTC thermistor is situated in the very tip of the sensor. This reduces the thermal path to the thermistor and minimises the response time.

Screw threaded boss designs, surface sensor fixings for pipes and simple push-fit/clip-in versions are all available with industry standard connector options or flying leads if preferred.

These are just some of our standard boiler sensor products.

Call us today on 01606 871680  discuss your requirements in detail so that we can help you, using our extensive technical knowledge and innovative supplier base, design the optimum sensor for your application, e.g. very-fast response sensors for district heating systems.


  • ATC Semitec BTS1 Boiler Temperature Probe
    ATC Semitec BTS1 Screw-In Temperature Probes

    Gas-boiler temperature sensor with 1/8″BSP gas thread and integral connector.

    • Fast response design (Tc ≤ 5s)
    • Accuracy ±3%, available ±0.2K (0-70°C)
    • Operating range up to +150°C possible
    • Excellent long-term stability.


  • ATC Semitec BTS2 Stainless Steel Temperature Sensors

    Stainless steel temperature sensor with 1/4″BSP gas thread and integral connector. Suitable for boiler flues and water sensing with a time constant (Tc) of less than 3s

    • Very fast response design (Tc < 3s)
    • Direct sensing stainless sensor
    • Suitable from -40°C/+150°C
    • Accuracy ±3%, available down to ±1%


    Suitable Applications

    • Gas Boilers/Boiler Flues
    • Catering equipment
    • Heat Exchangers
    • Air Conditioners
    • Humidifiers
  • BTS$ IP67 Pipe-Clip Surface Temperature Sensor
    ATC Semitec BTS3 IP67 Rated Pipe-Clip Surface Sensors

    IP67 rated clip-on temperature sensors for pipes from 13~28mm diameter. The NTC is housed in a miniature probe to optimise the thermal response, typically less than 1s

    • Fast response design (Tc ≤ 1s)
    • Accuracy ±1°C@25°C
    • IP67 Rated
    • Clip-on pipes from 13~28mm diameter ·
    • Operating range up to -20°C/ +120°C


     Suitable Applications

    • Gas Boilers
    • Heating and air conditioning systems
    • Instantaneous water heaters
    • Hot water showers
    • Anti-legionnaires systems
  • BTS4 Fast Response Temperature Sensor
    ATC Semitec BTS4 Push -Fit/Clip-In Sensors

    Push-fit/clip-in temperature sensors in brass with integral o-ring and very fast-response tip. Perfect for composite heat exchangers with a time constant of less than 3s

    • Push-fit design for plastic heat exchangers
    • Very fast response time (Tc<1s)
    • Accuracy ±1°C or better
    • Operating range up to -40 °C / 140°C


    Suitable Applications

    • Gas boilers
    • Heating and air conditioning systems ·
    • District heating ·
  • BTS5 Fast Response Boiler Temperature Sensors
    ATC Semitec BTS5 Fast Response Temperature Sensor

    Offering the best in temperature sensor technology.

    Very fast response temperature sensor with Tc typically less than 1s, ideal for use in district heating systems where slower sensors limit performance.

    • Very fast response design (Tc < 1s)
    • Sensor located at end of thin wall stainless steel tip
    • Operating range -40°C/+150°C
    • Variety of resistance values, connection types and mounting systems


    Suitable Applications

    • Gas Boilers/Boiler Flues
    • Electric Water Heaters
    • District Heating
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