UEI C165+ Residential / Commercial Combustion Analyzer

  • UEI C165+ Residential / Commercial Combustion Analyzer
  • UEI C165+ Residential / Commercial Combustion Analyzer
  • UEI C165+ Residential / Commercial Combustion Analyzer
  • UEI C165+ Residential / Commercial Combustion Analyzer
MSRP: $1,574.95
Price: $1,338.71
— You save $236.24


UEI C165+ Residential / Commercial Combustion Analyzer

Don't miss out on the great benefits of UEi Service+.
Register your combustion analyzer with UEi and get notified when its time to recertify.

Backed by UEi Service+ to allow up to 10 years’ warranty, same day recertification and a reduced cost of ownership. The C165+ Residential/Commercial Combustion Analyzer is easy to use with a rugged design, multiple sensor protections, altitude compensation and differential pressure. Prints to optional printer and wireless App. LINK connects the included wireless pipe clamp temperature probes and other optional probes to the C165+. Essential information for the installation and maintenance of furnaces and boilers – all in one place.

C165+ enables a LINK feature to connect to wireless probes. The LINK feature connects to the 2 wireless temperature pipe clamps (WPC2), which can be used to compare flow and return temperatures on a boiler. C165+ LINK also connects the optional DTHA2 (sold separately) to measure air flow. Contractors can use the Room CO test to take snap shots of ambient CO readings to view trending CO levels. C165+ has four types of sensor protection; an H2 compensated 10,000 ppm CO sensor, CO over-range purge pump, a NOx filtered CO sensor, and Low Flow Detection to protect the CO sensor. It offers differential pressure and has wireless capabilities to a Printer App for compatible iOS and Android devices. It also has sensor technology that reduces the cost of ownership. It features a Heat Exchanger test to check the exchanger integrity and differential temperature. The C165+ comes with High Altitude compensation to maintain accurate readings, auto-purge shut off, and 8 Pre-programmed fuels including Natural Gas and Propane.

The C165+ has a 6-Line display to view readings on one screen, which is a favorite among technicians. The DMM style dial makes it easy to select the test needed. It also features a water trap to protect the sensor with a check light to remind to look for condensate built-up, a magnetic boot for hands-free operations, and an IR printer port to print to the optional IR thermal printer, making it easy to document test results for later analysis.
NOTE: CO-AirFree (COa) Calculation can be set to be displayed in the AUX screen.

Product Features & Functions:

  • Up to 6 Year warranty with annual recertification
  • 3 Types of Sensor Protection
  • NOx Filtered
  • Link to Wireless Probes
  • K-Type Temperature Inputs
  • CO-AirFree (COa) Calculation
  • Low Flow Detection
  • Over Range Protection Pump
  • Temp differential
  • 6 line backlit display
  • Dual Presssure Input
  • Differential pressure
  • 8 Preprogrammed Fuels
  • 30 second start time
  • High altitude compensation
  • 30 Memory Positions
  • Protective Water Trap
  • Automatic fresh air purge
  • Magnetic mount
  • IR printer link (Printer not included)

UEi Combustion Analyzer Comparison


Parameter Range Resolution Accuracy
Flue Temperature 32-1112°F 0.1°F +3.6°F
+0.3% reading
Inlet Temperature
(Internal sensor)
32-112°F 0.1°F +1.8°C
+0.3% reading
Inlet Temperature
(External sensor)
32-1112°F 0.1°F +3.6°F
+0.3% reading
Oxygen 0-21% 0.1% +0.3%
Carbon monoxide 0-20ppm 1ppm +3ppm
+5% reading
Above 2000ppm
Purge pump operates
Carbon dioxide 0-20% 0.1% +0.3% volume
Efficiency (Net or Gross) 0-99.9% 0.1% +1.0% reading
Efficiency High (C) 0-119.9% 0.1% +1.0% reading
Excess Air 0-250% 0.1% +0.2% reading
CO/CO2 ratio 0-0.999 0.0001 +5% reading
CO-AirFree (COa) 0 to 9999 PPM 1 PPM ±5% rdg


  • (1) UEI C165+ Residential / Commercial Combustion Analyzer
  • (2) Wireless Pipe Clamp Probes
  • (3) Rechargeable (AA)
  • (1) AC509 Case
  • (1) USB cable
  • (1) Charger
  • (1) Water trap


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