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The TPI 709R Flue Gas Combustion Efficiency Analyser includes all the features you’ll need for Boiler commissioning, service and maintenance including performing Flow & Return and Tightness Tests.

709R Flue Gas Analyser
709R Flue Gas Analyser
709R Flue Gas Analyser Video
EN50379 H2 ready
709R Flue Gas Analyser Kit
709R Flue Gas Analyser Kit 1
709R Flue Gas Analyser Kit 2
709R Flue Gas Analyser Kit 3
709R Flue Gas Analyser Kit 4
709R Flue Gas Analyser Kit 5
709R Flue Gas Analyser Kit 1 Oil

Compare & Save with the Easy-To-Use, TPI 709R Flue Gas Combustion Efficiency Analyser designed to measure CO, O2, Temperature & Pressure and calculate CO2 (in a flue), CO/CO2 ratio, efficiency and excess air.

With a large, easy-to-read, backlit display, simple to navigate operating system with Fixed Price Annual Servicing, it really is the most cost efficient FGA on the market.

The standard kit comes complete with the 709R in a protective rubber boot, temperature sampling probe c/w external large water trap and unique in-lid water trap (as used by British Gas), soft carry case with shoulder strap, rechargeable battery pack & charger, pressure adaptors, ambient air probe, spare particle filter and instruction manual.

  • Various other kits available including IR Printer, Temperature Pipe Clamps, CPA1 Probes & Gas Leak Detector
  • H2 ready! EN50379 compliant
  • Print “Live” or “Stored” readings to optional A740 IR Printer
  • Six Year Warranty: Long Life O2 & CO sensors meaning lower servicing costs during a 6 Year Warranty Period*. Saving TIME & MONEY in cost of ownership during annual servicing!

£420 Base Kit RRP exc. VAT

See Kit Options below for all variations

709R Kit With Standard Accessories:

TPI 709R Analyser
Rubber Boot (A765) 1 each installed on analyser
Soft Carrying Case (A768)
Sampling Probe (c/w Type “K” Thermocouple)
In-Line Water Trap Bowl Filter (c/w Spare Particle Filter)
Battery Charger (A766)
Mini In-Line Pump Protection Filter (c/w 5 spare filters)
Exhaust Spigot Removable (A764)
Pressure Tubing (2 x 1 metres)
GK11M Air Probe
Instruction Manual
£420 RRP exc. VAT

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Build Your Own Kit: click on Buy Now below to start building the kit you need!


The TPI 709R conforms to EN50379 and is suitable for engineers working with BS7967, the usage standard.

Serial Number & Next Cal Due Date are printed at the bottom of each print-out ensuring that you always know your readings have been taken with the correct in-calibration flue gas analyser giving you complete peace of mind.

HHIC: The Heating & Hotwater Industry Council made a recommendation that from April 2013 that the CO level & CO/CO2 (Ratio) reading in a flue is recorded when a boiler is commissioned and that this practise become mandatory from April 2014. Please click here for further details.

The recording of the CO level and Ratio reading will become a mandatory part of completing the Benchmark Form.

Combustion Performance Analysis (CPA1): From April 2012 it has been compulsory for all engineers to acquire CPA1 Assessment to prove their competency in using a Flue Gas Analyser. Please click here for complete details.

Model 709R Features

  • Measure CO, O2 & Flue Temperature
  • Calculate CO2, CO/CO2 Ratio, Efficiency & Excess Air
  • Dual Input Differential Manometer – Great for performing Standing Pressure or Let By/Tightness Tests
  • Dual Input Differential Thermometer – Ideal for measuring & recording Flow & Return Temperatures
  • Ambient CO Analysis
  • 6 Year Warranty* (* subject to annual service being carried out each year by TPI or one of its approved local service centres)
  • Diagnostic software & technical helpline combine to save time and money on reduced downtime as many of the reported faults can be rectified over the phone keeping you and your instrument working
  • Unique external water trap filtration system as standard on all kit options preventing loss of downtime or additional costs due to potentially damaged sensors caused by water ingress
  • 10 Fuel options including Wood, Light & Heavy Oil, LPG and Natural Gas
  • Will not shut off if CO ppm is above 15ppm for increased safety for both the user and the instrument
  • Unique in-line pump protection filter fitted as standard across all kits preventing loss of downtime or additional costs due to a potentially damaged pump caused by dust/dirt ingress
  • Protective rubber boot as standard to protect the FGA
  • Re-Chargeable battery housed in a separate compartment ensuring no heat transfer when using on the mains to affect gas readings
  • All kits come supplied in a soft carry case to protect not only the FGA but all of your accessories
  • Capability of sending Live or Stored readings to an optional IR Printer
 Model 709R Specifications
 Operating Temperature Range  14°F to +122°F (-10°C to +50°C)
 Battery / Batery Life  Rechargeable Ni-MH / > 6 Hours
 Charger Input Voltage  115V or 230V : 50/60 Hz AC
 Fuels  Natural Gas, LPG, Light Oil, Heavy
Oil, Bituminous Coal,
Coal, Coke, Butane, Wood, Bagasse
 Pressure Ranges  mbar, kPa & inH2O
 Display  Backlit Graphic LCD
 Data Storage  50 sets of readings, multiple pages
 Time and Date  24 Hour Real Time Clock
 Dimensions  7.8” (200mm) x 3.5” (90mm) x 2.4” (60mm)
 Weight  500g
 Casing  Rubber Boot as Standard
 Switch Off  Failsafe
 Exhaust  Safety Spigot
 Conforms to  EN50379


 Flue Temperature Probe
 Construction  Pistol Grip with Stainless Steel Shaft
 Hose Length  8.2’ (2500mm)
 Insertion Length  7.9” (200mm)
 ‘K’ Type Thermocouple Accuracy  +/- 0.3% of fullscale, +/- 2°F (1°C)
 Maximum Temperature  1472°F (800°C)


 Gases  Range  Resolution  Accuracy
 Oxygen  0-25%  0.1%  +/- 0.3%
 Carbon Monoxide  0-10,000 ppm  1 ppm  (<20ppm) +/- 3 ppm
(>=100ppm) +/- 5%
 Carbon Dioxide (calculated  0-25%  0.1%  Calculated
 CO/CO2 Ratio  0-0.999  0.001  +/- 0.3%
 Combustion Efficiency  0-100%  0.1%


 Pressure Measurement
 Selectable Ranges  mbar, kPa and inH2O
 Range  – 150 mbar to + 150 mbar
 Resolution  0.01 mbar & 0.1 mbar

Click to view or download product PDFs

709R Manual

709R Tech Sheet

709R Features & Benefits

Analyser Frequently Asked Questions

Can I use my analyser on Oil Fired Appliances?

Yes. Please ensure that the analyser is set to the correct fuel and that the additional oil filter (A773) is fitted. It is also recommended to use a smoke pump before performing any analyser test. NOTE: Do not use the A773 oil filter if an NO/NOx sensor is fitted

Can I use my analyser to perform Tightness Tests?

Yes. All TPI Flue Gas Analyser models have pressure which will allow all types of pressure testing to be performed; the 716 has in-built software which makes Tightness Testing even easier to perform.

Can I read Flow & Return Temperatures with a TPI Analyser?

Yes. All TPI Flue Gas Analyser models have Differential Temperature (Dual Inputs) which enables 2 temperatures to be taken at the same time and the difference calculated and displayed.

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