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Fujitsu
Fujitsu Comfort 5.0kW Reverse Cycle Split System
Cooling5.00kW
Heating5.20kW
Room size35-50 m2
Indoor noise27-46 dB
Warranty5 years
The Fujitsu Comfort 5.0kW reverse cycle split system bridges the gap between medium and large room applications, with enough output for a generous bedroom, a large home office, or a smaller family living space.
Final sizing should be confirmed through an on-site assessment, as insulation, ceiling height, glazing, sun exposure and room layout can all affect the right unit choice.
Overview of Fujitsu Comfort 5.0kW Reverse Cycle Split System
▾The ASTH18KNTA pairs with the AOTH18KNTA outdoor unit, delivering 5.0kW of rated cooling and 5.2kW of rated heating. This is the top of the medium-capacity group in the Comfort range and is frequently specified for master bedrooms, open-plan dining areas, or living rooms where a single unit is expected to handle moderate heat loads. The i-PAM all-DC inverter compressor continuously adjusts output speed to match the prevailing heat load, avoiding the temperature swings of on/off cycling.
Compared to the smaller KNCA variants, the KNTA suffix signals a step up in outdoor unit specification. The outdoor unit grows to 799mm wide with a 33kg weight, and the gas pipe diameter increases to 12.7mm. Maximum pipe length extends to 25m with a 20m height difference, providing more flexibility in outdoor unit placement relative to the indoor unit. Refrigerant charge is 890g of R32.
Wi-Fi control is available via the optional UTY-NXT-BOX adaptor, not included as standard. Corrosion resistance of the outdoor unit heat exchanger is improved with a blue fin treatment, which is relevant in the Hunter Valley where coastal-adjacent properties exist in the lower valley regions.
– 5.0kW cooling and 5.2kW heating with i-PAM all-DC inverter
– Increased pipe allowance: 25m length and 20m height difference
– Blue fin heat exchanger treatment on outdoor unit for improved corrosion resistance
– Super Quiet Mode at 27 dB(A) cooling
– R32 refrigerant (890g charge)
– Auto Restart, Sleep Timer, Program Timer, Auto Louvre as standard
Is the Fujitsu Comfort 5.0kW Reverse Cycle Split System right for your home?
▾– Master bedrooms and large bedrooms up to approximately 35–40 m2
– Smaller open-plan living and dining areas
– Family rooms and home theatres with moderate heat load
– Homes where a single unit needs to cover a versatile-use space
Performance & Efficiency
▾Cooling Capacity
5 kW
Heating Capacity
5.2 kW
Recommended Room
35–50 m²
Inverter
Yes
YesEER
3.47
COP (Heating)
3.91
Star ratings from Fujitsu ZERL (average climate zone used): cooling 3.5/3.5/3.5 (hot/average/cold); heating 3/2.5/2 (hot/average/cold). Annual EER and annual COP not published by manufacturer.
Noise Levels
▾Indoor Min
27 dB(A)
Indoor Max
46 dB(A)
Outdoor
49 dB(A)
Indoor: 27 dB(A) quiet cooling / 29 dB(A) quiet heating / 46 dB(A) high (both modes). Outdoor: 49 dB(A) both modes.
Power & Installation
▾Power Supply
240V Single Phase
Max Power Input
2.17 kW
Max Current
6.4 A
Max Pipe Length
25 m
Max Pipe Height
20 m
Refrigerant & Environment
▾Refrigerant
R32
Dimensions & Weight
▾Indoor (W×H×D)
834 × 270 × 232 mm
Outdoor (W×H×D)
799 × 542 × 290 mm
Warranty
▾Warranty period
5years
5-year full parts and labour warranty.
Model Details
▾Model NameComfort
Model NumberASTH18KNTA
Indoor UnitASTH18KNTA
Outdoor UnitAOTH18KNTA
Features
▾Quiet Mode
Turbo Mode
Sleep Mode
Energy Efficiency & Performance
▾The ASTH18KNTA achieves a rated EER of 3.47 for cooling and a COP of 3.91 for heating. The EER and COP are both solid for a unit at this capacity, though they are lower than the smaller 09 and 12 variants — a normal characteristic of larger units where the ratio of performance per input watt decreases slightly with capacity.
The unit holds 3.5 stars for cooling across all three ZERL climate zones (hot, average, and cold), which is unusual — most units show variation across zones. For heating, the average-zone rating is 2.5 stars, dropping to 2.0 stars in the cold zone, which reflects reduced heat pump efficiency during Hunter Valley winters with overnight temperatures below 5 degrees. Running the unit in heating mode at reduced fan speed reduces noise and can help maintain efficiency during low-demand overnight periods.
Installation Notes for the Fujitsu Comfort 5.0kW Reverse Cycle Split System
▾This system pairs the ASTH18KNTA indoor unit with the AOTH18KNTA outdoor unit.
Published installation details include maximum pipe length of 25m, maximum height difference of 20m, power supply: 240v_single_phase.
A site assessment should confirm unit placement, pipe route, drainage, electrical requirements and final room sizing before installation.
Warranty Information
▾This unit has a 5-year warranty, based on the warranty information recorded for this model.
5-year full parts and labour warranty.
Warranty coverage depends on correct installation, normal use, maintenance requirements and the manufacturer’s current warranty terms.
Frequently Asked Questions
▾Is the ASTH18KNTA suitable for a large bedroom?
Yes. At 5.0kW cooling it suits rooms up to approximately 35--40 m2. Quiet mode operates at 27 dB(A), which is suitable for sleeping, though louder than the smaller KNCA models in the range.
How does this compare to the ASTH14KNCA?
The 18KNTA adds 0.8kW cooling and 0.5kW heating, a longer pipe allowance (25m vs 20m), and the larger KNTA outdoor unit with a 12.7mm gas pipe. It is the appropriate choice when room size or heat load slightly exceeds what the 14KNCA comfortably handles.
What is the outdoor noise level?
Outdoor sound pressure is 49 dB(A) in both cooling and heating modes -- lower than several larger units in the Comfort range.
What is the warranty?
5-year full parts and labour warranty on all Fujitsu General domestic systems.
Is it suitable for use with solar?
Yes. The rated cooling input of 1.74kW draws comfortably within the output of a standard 5--6.6kW solar system during peak generation hours.