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    Flue gas analysers

    Flue gas measuring instruments have been among Testo’s bestsellers for decades. 40 years ago, our flue gas analysers were heavy and bulky, but today they are compact and networked.

    For every task on boilers

    Testo’s engineers work continually on the ongoing development of measuring instruments for smoke gas analysis, because it is only by carrying out regular servicing with a suitable flue gas measuring instrument that heating systems can run efficiently, emissions be reduced and you work even more easily.

    A flue gas analyser from Testo offers you

    • Reliable brand quality with over 60 years’ experience

    • Service and maintenance directly from the manufacturer

    • Extensive range of probes which often replace additional measuring instruments.

    Product Spotlight: The NEW testo 300+ Smart Heat Pump kit

    The game-changing kit for HVAC engineers

    Be equiped to carry out measuring tasks on boilers and heat pumps.

    • testo 300+ smart flue gas analyser - the ultimate instrument for working on boilers

    • testo 550i app-operated digital manifold - commission and service heat pumps, as well as refrigeration and air conditioning systems

    • Two testo 115i bluetooth pipe clamp thermometers - for boiler flow/return temperature measurement and flow/return on monobloc heat pumps

    • testo 510i digital manometer - for gas pressure testing

    The NEW testo 310 (2nd Gen) flue gas analyser

    The perfect entry-level analyser. Combines simple functions with a high level of measurement accuracy, and is perfect for all basic measurements on domestic heating systems.

    testo 327 flue gas analyser

    A reliable and robust entry into flue gas analysis for domestic boilers.

    All-NEW testo 300+ Kits

    Truly smart flue gas measurement just got smarter: Now with enhanced sensors, an improved cost of ownership and connectivity of up to 4 smart probes!

    testo 300LL flue gas analyser

    Carry out installation and maintenance work on commercial heating systems using this flue gas analyser with Longlife sensors.

    For flue gas measurements, there’s no alternative: the testo 300

    Efficient, wireless measurement of up to four additional parameters in parallel, such as pressure and temperature. Featuring a practical second screen and intuitive operation – it really couldn’t be easier.

    Save valuable time by carrying out simple, intuitive documentation on site and sending measurement data by e-mail via the testo Smart App. Discover the benefits of easy data integration into your in-house software via QR code – fewer transmission errors, less paperwork, less stress. Discover the advantages of easy data integration into your company's own software using a QR code - fewer transmission errors, less paperwork, less stress.

    Find out more about wireless parallel measurements in record time!

    Other measuring instruments for heating systems

    In addition to measuring the most important flue gas parameters such as temperature, draught, pressure, O2, CO, CO2 or NO, there are of course other measurement tasks associated with the heating system. Whether it's a leak detector or measuring devices for smoke and CO2 measurement – you're guaranteed to find what you're looking for at Testo. Here is a small selection of our highlights:

    Flue gas analysis and heating system applications

    Professional heating measurement technology for every requirement.

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    The interface to the future. Testo Connectivity.

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    Tips & tricks

    Carry out measuring tasks on heating systems efficiently and safely

    Download the exclusive practical guide for free now.

    To download

    Checking the gas connection pressure

    Setting the gas-air ratio

    Preparing the flue gas analyser

    Determining the flue gas loss

    Calculating the efficiency (η)

    And much more ...

    testo Smart App

    Welcome to the testo Smart World: The whole world in one app.

    Faster, simpler, smarter: the testo Smart App brings all tools and measurements together - and documentation can also be conveniently managed using a smartphone or tablet. Benefit from intelligent connectivity and the complete solution for all applications. So that not only the jobs on all heating systems are smart and effortless.

    Find out more

    Parallel measurement

    Efficient and safe

    Documentation

    Simple and secure

    Customer data management

    Fast and simple

    Data transfer

    Professional and convenient

    Second Screen

    Simply comfortable

    Remote Control

    Easy and flexible