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testo 300+ Flue Gas Analyser Heat pump kit - (O2, CO sensor up to 8,000 ppm)

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The testo 300+ Flue Gas Analyser Heat Pump Kit is a professional measurement package for engineers working across boiler and heat pump heating systems. It supports combustion testing alongside wider heating diagnostics, making it suitable for modern mixed-technology installations. It is ideal for boiler servicing and combustion checks, heat pump-related service workflows, commissioning, diagnostics and efficiency reporting.
  • Bluetooth clamp probes and manometer allow wireless measurement of flow/return temperature alongside gas pressure and differential temperature
  • Kit provides test equipment for boiler combustion testing as well as testing of monobloc or split system heat pumps
  • Designed for domestic boiler service, 8,000ppm H2 compensated  CO sensor and O2 sensor fitted with 5 year lifespan

testo 300+ Flue Gas Analyser Heat Pump Kit

The testo 300+ Heat Pump Kit is a professional flue gas analyser package for engineers working across boilers, hybrid heating systems, and heat pump-related HVAC workflows.

How to Support Modern Heating Work Across Boilers and Heat Pumps

When engineers work on both traditional boilers and modern low-carbon heating systems, flexible test equipment becomes essential. The testo 300+ Heat Pump Kit supports combustion testing for gas and oil-fired appliances while fitting into wider heating and HVAC diagnostic workflows.
This makes it useful for engineers working on hybrid systems, boiler upgrades, and heat pump installations. It helps professionals stay equipped for current boiler servicing while preparing for the growing demand for renewable heating support.
The kit is suitable for domestic, commercial, and light industrial heating applications.

Why Combustion Testing Still Matters in Hybrid Heating Systems

Even as heat pumps become more common, many sites still use boilers as part of the heating system. Accurate flue gas analysis remains essential for checking appliance safety, efficiency, and emissions.

The testo 300+ supports:
  • CO and O₂ measurement: Helps assess combustion safety and air supply.
  • Flue gas temperature checks: Supports boiler efficiency assessment.
  • Draught and pressure support: Helps verify flue and appliance operation.
  • Calculated values: CO₂, excess air, and efficiency for clear performance checks.
  • Real-world application: On a hybrid heating site, engineers can check boiler combustion and support wider heating diagnostics during the same visit.

Solving Mixed-System Diagnostic Challenges

Modern heating systems can involve boilers, heat pumps, cylinders, controls, and distribution circuits. Faults may come from combustion issues, temperature imbalance, pressure problems, or poor system setup.
The testo 300+ Heat Pump Kit helps engineers take a more joined-up approach. It supports boiler combustion checks while connecting naturally with Testo temperature, pressure, and HVAC accessories for wider system analysis.

Streamlining a Future-Ready Heating Toolkit

This kit can be linked with compatible Testo flue gas probes, Smart Probes, temperature probes, pressure accessories, calibration services, replacement filters, and printer options. It also fits well with digital manifolds, clamp thermometers, vacuum gauges, gas leak detectors, and heat pump commissioning tools.

Built for the Changing Heating Industry

The testo 300+ Heat Pump Kit is designed for engineers adapting to both combustion and renewable heating work.
  • Supports boiler combustion testing
  • Useful for hybrid and heat pump-related workflows
  • Suitable for domestic and commercial heating systems
  • Compatible with selected Testo HVAC accessories and calibration services

testo 300+ flue gas analyser with O2 and CO sensor up to 8,000 ppm (0633 3004 40)
USB mains unit, including cable (0554 1105)
Compact basic flue gas probe, 180 mm; Ø 6 mm; Tmax. 500°C; 1.5 m hose; including cone for fixing (0600 9740)
1 x testo 510i Smart probe manometer (0560 1510)
2 x testo 115i Smart probe pipe clamp thermometers (0560 2115 02)
1 x testo 550i smart digital manifold (0564 2550 02)
testo Bluetooth connector (0554 3004)
soft-case style Instrument bag (0516 3001)

CO probes

Flue gas probes

Further probes

Humidity probes

Pressure probes

Temperature probes

Refrigeration systems, air conditioning systems, heat pumps

  • Determination of high and low pressure, automatic determination of condensation and evaporation temperature and calculation of superheating/subcooling. All results can be read simultaneously on one screen
  • Tightness test: Recording and analysis of the pressure curve
  • Automatic calculation of the target superheat (in conjunction with the appropriate measuring instrument, e.g. Testo Smart Probe)
  • Measure vacuum: Graphic progression display of the measurement with indication of the start and differential value
  • Evacuation: Graphic progression display of the measurement with indication of the start and differential value (in conjunction with the appropriate Testo Smart Probe, e.g. testo 552i vacuum probe)
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Newman Lane
GU34 2URAlton
HampshireUnited Kingdom
01420 544433

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