1. Home
  2. Products
  3. Find the right flue gas analyser from Testo

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.

Testo flue gas analysers

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

testo 300 heat pump kit

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

testo 327 flue gas analyser

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

testo 300 flue gas analyser

Truly smart flue gas measurement: High-quality sensors, intuitive operation with smart-touch technology and smart features.

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 NEXT LEVEL

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:

Smart Probes

Digital Manifolds

perfect for heat pumps

testo 550i Smart Kit

Digital Manifolds

Thermal Imaging Cameras

Bestseller

testo 868s

Thermal imaging cameras

Digital Manometers

CO2 meter

CO meter testo 317-3

Highlight

testo 317-3

CO meter

Flue gas analysis and heating system applications

Image

Professional heating measurement technology for every requirement.

Find out more

Image

The interface to the future. Testo Connectivity.

Find out more

Tips & tricks

Carry out measuring tasks on heating systems efficiently and safely

Download the exclusive practical guide for free now.

Measuring tasks on heating systems

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.

Contact Us
Testo Ltd
Newman Lane
GU34 2URAlton
HampshireUnited Kingdom
01420 544433

Opening hours

Monday-Thursday: 8:30am - 17:00pmFriday: 8:30am - 16:00pm
Image
Blog

Visit our blog

© 2026