Flue Gas Analyser Buying Guide — The Best, Cheapest, and Most Popular

A flue gas analyser is a gas engineer’s most important tool. Without one, any commissioning, servicing, or repair work comes to a complete standstill.

But they’re also the most expensive, the most complex, and at times the trickiest tool to use.

For all the above reasons, buying the right analyser for your needs is critical to how well you can do your job.

We’ve written this flue gas analyser buying guide to help you make that decision. Keep reading for the best options on the market, the cheapest flue gas analysers, and more.

The most popular flue gas analysers

We surveyed our customers, and from 595 responses, here are the most popular brands:

It’s clear that Kane and Anton have the lion’s share of the market, and are extremely popular amongst engineers.

For specific models, these were the most popular:

• Kane 458s (and 458)
• Anton Sprint Pro
• Testo 300+

What are the best flue gas analysers?

To answer this question, we first need to think about what ‘best’ means in this context. 

The most feature-rich analyser? The most durable? The cheapest?

In reality, the best flue gas analyser is the one best-suited for the type of work you do. If you’re looking for well-featured and highly regarded analysers, you can’t go wrong with any these brands:

• Anton – Browse their full range here. 

• Kane – Browse their full range here. 

• TPI – Browse their full range here. 

• Testo – Browse their full range here. 

We know that each of these brands has a wide selection of different analysers and analyser kits. So where do you start?

Flue gas analyser buying guide by feature

Since the best flue gas analyser will depend on the type of work you do, we’ve broken our recommendations down into different use cases.

Prices at time of writing (September 2025), excl. VAT. For guide purposes only.

 Domestic

Key requirements: Standard sensors for O₂, CO, and CO/CO₂ ratio calculation. Must be suitable for BS 7967 compliance and CPA1 assessments.

• TPI: DC710 or DC711
  • Price: £375 / £610
• Anton Sprint Pro 2
  • Price: £573 £458.40
• Testo: 310 (2nd Gen)
  • Price: £449
• Kane: 258
  • Price: £539

 Commercial & Light Commercial

Key requirements: High-range CO sensor (up to 10,000 ppm) and the option to add a NOx sensor for environmental checks.

• TPI: 709R
  • Price: £460 (base price)
• Anton Sprint Pro 5
  • Price: £1046 £837.60
• Testo: 300LL with NOx sensor option
  • Price: £ 2,299
• Kane: 458s
  • Price: £1318 (including NO sensor)

 Commercial Catering (COMCAT)

Key requirements: In addition to combustion analysis, the key feature is an infrared sensor for measuring ambient CO₂ to check kitchen ventilation (for CP42 certificates).

• Anton Sprint Pro 4
  • Price: £1036 £828.80
• Kane: 458s COMCAT Kit
  • Price: £1608

 CO/Fume Incident Investigation

Key requirements: High accuracy at low ppm ranges and compliance with BS 7967 procedures for investigating CO incidents.

• TPI 709R
  • Price: £460 (base price)
• Anton Sprint Pro with CMDDA1 add-ons (Gas leak detector, personal CO alarm, ambient air probe)
  • Price: Varies
• Kane: KANE-CMDDA1 Kit
  • Price: 1159 (base price)

 Industrial

Key requirements: Robust build, ability to measure a wider range of gases (like SO₂ and NO₂), and suitability for high-temperature and harsh environments.

• TPI: 709R
  • Price: £460 (base price)
• Anton Sprint Pro 6
  • Price: £1,168 £934.40
• Testo: 340
  • Price: £3,599
• Kane: 958
  • Price: from £1,289

Note that extra features don’t necessarily make a ‘better’ analyser. According to Kieran from Anton, you can’t really “overspec” your analyser (see more in the podcast below). However, you can equally save money by getting one with just the features you need. 

For example, those doing purely domestic work might only need an analyser with tightness testing, flue gas analysis, and temperature differential, but those doing commercial work will need a more complex analyser. 

How do calibration costs compare between brands?

Whichever analyser you buy, it needs calibrating every year. Prices below are ex VAT, checked August 2026.

Anton

Anton charge £115 to £184 a year depending on which Sprint Pro you’re running, and year five adds about £100 extra for sensor replacement. Turnaround is guaranteed two working days. Full per-model pricing is on the Anton website.

Kane

Kane charge in the range of £165 to £235 a year, increasing in the fifth year. For exact prices, you’ll need to log into the KANE dashboard. Kane do same-day service or your money back.

Testo

Testo charge £139 a year for most domestic models, with the third-year service stepping up to £179. The commercial 300LL and 330LL cost £169 to £219. There’s a 24-hour express option if you’re stuck, and Testo publish a full price table by model.

TPI

TPI are the cheapest to maintain: £95 a year for a DC710 or 709R and £110 for a DC711. Their step-up lands later than everyone else’s, in year six, at £195 to £210. With the NOx sensor fitted, this will jump to ~£190 a year instead. TPI’s full cost schedule is here.

For where to get the work done, what the rules actually say, and what happens if you’re caught with an out-of-date analyser, read our guide to flue gas analyser calibration.

USING YOUR ANALYSER WITH GES

You can sync your analyser readings straight into a certificate with GES

Learn more about how it works →

GAS ENGINEER PODCAST

Behind Anton Flue Gas Analysers: The Manufacturer’s Perspective

The cheapest flue gas analysers

Some of the cheapest flue gas analysers on the market are models made by TPI. These devices, such as the DC710, lack a few peripheral features and a screen, meaning you’ll have to connect them to your phone to see the readings. This doesn’t make them any less accurate or reliable at measuring combustion gases, though. 

The TPI: DC710 is one of the best value for money flue gas analysers, currently retailing for around £375. 

You may also find models like the Anton Sprint Pro 2 on sale for not much more.

All Bluetooth-enabled analysers work flawlessly with Gas Engineer Software in the same way more expensive options do, so they can be a great way to save some money. 

You’ll also find some analyser models that use paper rolls to print out readings. These analysers might be cheaper, but you’ll spend lots of money topping up these rolls in the long run.