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Worcester Bosch Climate CL3000i 3.5kW Single Split Air Conditioning System – Heating & Cooling A++ Rated R3
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Worcester Bosch Climate CL3000i 3.5kW Single Split Air Conditioning System – Heating & Cooling A++ Rated R3

Worcester Bosch Climate CL3000i 3.5kW Single Split Air Conditioning System – Heating & Cooling A++ Rated R3

3.5 kW Cooling 3.8 kW Heating A++ Cooling (SEER 7.0) A+ Heating (SCOP 4.2) R32 Refrigerant Silent Mode 20 dB(A) DC Inverter Wi-Fi Ready i-Clean Self-Cleaning

The Worcester Bosch Climate CL3000i 3.5 kW single split system (indoor unit CL3000iU W 35 E + outdoor unit CL3000i 35 E) is a reversible air-to-air heat pump that delivers both cooling and heating from a single wall-mounted unit — making it one of the most versatile comfort solutions for UK homes and small commercial spaces. With a SEER of 7.0 (A++ cooling) and SCOP of 4.2 (A+ heating), it provides year-round climate control at significantly lower running costs than conventional electric heating. The system combines whisper-quiet Silent Mode operation from just 20 dB(A), an intelligent i-Clean self-sanitising evaporator that eliminates up to 99% of bacteria, and optional Wi-Fi control via the Bosch HomeCom Easy app — all in a compact, elegantly styled indoor unit measuring just 802 × 200 × 295 mm.

3.5 kW
Cooling Capacity
3.8 kW
Heating Capacity
SEER 7.0
A++ Cooling
SCOP 4.2
A+ Heating
20 dB
Silent Mode
Key Features & Benefits
DC Inverter Technology — Efficient & Responsive
Variable-speed DC inverter compressor continuously modulates output to match the exact heating or cooling load, eliminating the on/off cycling of fixed-speed units. The result is faster room temperature recovery, tighter temperature control (±0.5°C) and significantly lower electricity consumption — the rated 3.5 kW cooling capacity draws just 1,096 W at nominal load.
A++ Cooling / A+ Heating ErP Rating
With a SEER of 7.0 for cooling and SCOP of 4.2 for average-climate heating, the CL3000i meets and exceeds current EU ErP seasonal efficiency requirements. In warmer conditions, the SCOP rises to 5.5 (A+++ rated). This level of efficiency translates directly into lower energy bills versus older fixed-speed or lower-rated units.
Silent Mode — Indoor from 20 dB(A)
At its quietest setting, the indoor unit operates at just 20 dB(A) — quieter than a whispered conversation and virtually imperceptible in use. Three operating speeds are available (Hi/Mi/Lo: 37/32/22 dB(A)) alongside the dedicated Silent Mode, making this system genuinely suitable for bedrooms, home offices and noise-sensitive environments.
i-Clean Self-Sanitising Evaporator
Worcester Bosch's i-Clean function heats the evaporator coil to 56°C after use, destroying bacteria, mould spores and other biological contaminants that would otherwise accumulate on the heat exchanger surface. This keeps the unit hygienic between service visits and eliminates up to 99% of bacteria — ensuring only clean, fresh air is circulated into the room.
Double Filtration — Air Purification as Standard
A dual-stage filtration system captures airborne particulates and neutralises odours, harmful gases and volatile organic compounds (VOCs) before they reach the room. The filter is washable and reusable, reducing maintenance costs and ensuring consistently clean air throughout the system's life.
Follow Me — Personalised Room Comfort
The Follow Me feature uses the temperature sensor built into the remote controller rather than the indoor unit sensor, so the system responds to the actual temperature at your location in the room. This is particularly effective in large open-plan spaces where the indoor unit may be some distance from the occupied zone.
Heating Down to -15°C Outdoor Temperature
The CL3000i maintains full heating performance down to -15°C outdoor ambient temperature, making it genuinely useful as a primary or supplementary heating source throughout UK winters. The wide operating range (-15°C to +50°C for cooling, -15°C to +24°C for heating) gives confidence in year-round reliability regardless of weather conditions.
Wi-Fi Control via Bosch HomeCom Easy App
With the optional Connect Key G10 CL-1 accessory, the CL3000i connects to the Bosch HomeCom Easy app for smartphone and tablet control from anywhere. Schedule operating times, adjust temperature setpoints, monitor energy usage and switch modes remotely — full remote management without a separate controller.
Corrosion-Resistant Outdoor Unit
The outdoor unit features a golden-fin anti-corrosion coating on the heat exchanger, providing protection against salt-laden air and atmospheric pollutants. This makes the system particularly suitable for coastal and urban UK locations and contributes to a long, low-maintenance service life.
R32 Low-GWP Refrigerant
Charged with R32 refrigerant (GWP 675) — approximately one third of the GWP of the R410A it replaces — the CL3000i aligns with the current EU F-Gas regulation trajectory towards lower-impact refrigerants. The hermetically sealed system contains just 0.65 kg of refrigerant.
Technical Specifications — CL3000i 3.5 kW (35 E)
Cooling Performance
Rated Cooling Capacity (min – nom – max) 3.5 kW (1.3 – 3.5 – 4.3 kW)
Cooling Power Input (nominal) 1,096 W (120 – 1,650 W)
Cooling Current Input (nominal) 4.76 A (0.5 – 7.2 A)
Seasonal Design Cooling Load (Pdesignc) 3.6 kW
SEER 7.0
Cooling Energy Efficiency Class A++
Heating Performance
Rated Heating Capacity (min – nom – max) 3.8 kW (1.1 – 3.8 – 4.4 kW)
Heating Power Input (nominal) 1,027 W (110 – 1,480 W)
Heating Current Input (nominal) 4.46 A (0.5 – 6.4 A)
Seasonal Design Heating Load — Average Climate (Pdesignh) 2.5 kW
SCOP — Average Climate 4.2 (A+ rated)
SCOP — Warmer Climate 5.5 (A+++ rated)
Balance Point Temperature (Tbiv) -7°C (average) / +2°C (warmer)
Heating Operating Range (outdoor) -15°C to +24°C
Electrical Supply
Power Supply 220–240 V, 1-Phase, 50 Hz
Indoor Unit — CL3000iU W 35 E
Dimensions (W × D × H) 802 × 200 × 295 mm
Net / Gross Weight 8.7 kg / 11.5 kg
Airflow Volume (Hi / Mi / Lo) 530 / 400 / 350 m³/h
Sound Pressure Level (Hi / Mi / Lo / Silent) 37 / 32 / 22 / 20 dB(A)
Sound Power Level 56 dB(A)
Part Number 7-733-701-566
Outdoor Unit — CL3000i 35 E
Dimensions (W × D × H) 720 × 270 × 495 mm
Net / Gross Weight 23.7 kg / 25.5 kg
Airflow Volume 1,850 m³/h
Sound Pressure Level 55.0 dB(A)
Sound Power Level 63.0 dB(A)
Part Number 7-733-701-567
Refrigerant Circuit
Refrigerant Type R32
GWP 675
Refrigerant Charge 0.65 kg
Design Pressure (high / low) 4.3 MPa / 1.7 MPa
Liquid Pipe Diameter 6.35 mm (¼")
Gas Pipe Diameter 9.52 mm (⅜")
Maximum Pipe Length 25 m
Maximum Height Difference (indoor/outdoor) 10 m
Additional Refrigerant Charge (beyond 5 m) 12 g/m
Operating Conditions
Indoor Cooling / Heating Temperature Range 17–32°C / 0–30°C
Outdoor Cooling Temperature Range -15°C to +50°C
Outdoor Heating Temperature Range -15°C to +24°C
Kit Part Number
BOM (complete set) 7733701736
ℹ F-Gas Qualified Installation Required: This system contains fluorinated greenhouse gases (R32) and must be installed, commissioned and serviced by an F-Gas registered engineer. Electrical connection must be carried out by a qualified electrician. Wi-Fi control requires the optional Connect Key G10 CL-1 (sold separately). A 3-port valve is not required for single-split operation.
Frequently Asked Questions
Can the CL3000i heat as well as cool?
Yes — it is a reversible single split air-to-air heat pump. In heating mode it delivers 3.8 kW of heat output with a SCOP of 4.2, meaning it produces approximately 4.2 kW of heat for every 1 kW of electricity consumed. It continues to heat effectively down to -15°C outdoor temperature, making it a viable primary or supplementary heat source throughout the UK winter.
What room size is the 3.5 kW system suitable for?
As a general guide, a 3.5 kW cooling capacity is appropriate for rooms of approximately 25–40 m² depending on insulation quality, glazing area, solar exposure and occupancy. For an accurate sizing calculation, use our BTU calculator or speak to an F-Gas installer who can carry out a full heat loss assessment. The system is rated for indoor temperatures between 17–32°C (cooling) and 0–30°C (heating).
How do I control it — is there a smartphone app?
The unit comes with an infrared remote controller as standard. For smartphone control, the optional Connect Key G10 CL-1 accessory (sold separately) adds Wi-Fi connectivity and enables full control via the Bosch HomeCom Easy app on iOS and Android — including scheduling, temperature adjustment, mode changes and energy monitoring from anywhere.
What does i-Clean actually do?
After a cooling or heating cycle, the i-Clean function runs a self-drying and sanitising cycle on the indoor evaporator coil. The evaporator is heated to 56°C, which kills bacteria, mould and other biological contaminants that would otherwise grow on the damp heat exchanger surface between uses. This maintains hygiene and prevents the musty odours that can develop in uncleaned air conditioning units, and is claimed to eliminate up to 99% of bacteria.
Is professional installation required — can I install it myself?
Installation must be carried out by an F-Gas registered engineer because the system is pre-charged with R32 refrigerant, which is a regulated fluorinated greenhouse gas. Only F-Gas certified contractors are legally permitted to handle, transfer and top up refrigerant under UK and EU F-Gas Regulation. The electrical supply connection must also be carried out by a qualified electrician. Attempting DIY installation will void the manufacturer's warranty and may be unlawful.
Related Products
Worcester Bosch CL3000i 2.6 kW
For smaller rooms up to ~25 m²
Worcester Bosch CL3000i 5.3 kW
For larger rooms up to ~50 m²
Bosch Connect Key G10 CL-1
Wi-Fi accessory for HomeCom Easy app
$388.77

Original: $1,110.78

-65%
Worcester Bosch Climate CL3000i 3.5kW Single Split Air Conditioning System – Heating & Cooling A++ Rated R3

$1,110.78

$388.77

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Worcester Bosch Climate CL3000i 3.5kW Single Split Air Conditioning System – Heating & Cooling A++ Rated R3

3.5 kW Cooling 3.8 kW Heating A++ Cooling (SEER 7.0) A+ Heating (SCOP 4.2) R32 Refrigerant Silent Mode 20 dB(A) DC Inverter Wi-Fi Ready i-Clean Self-Cleaning

The Worcester Bosch Climate CL3000i 3.5 kW single split system (indoor unit CL3000iU W 35 E + outdoor unit CL3000i 35 E) is a reversible air-to-air heat pump that delivers both cooling and heating from a single wall-mounted unit — making it one of the most versatile comfort solutions for UK homes and small commercial spaces. With a SEER of 7.0 (A++ cooling) and SCOP of 4.2 (A+ heating), it provides year-round climate control at significantly lower running costs than conventional electric heating. The system combines whisper-quiet Silent Mode operation from just 20 dB(A), an intelligent i-Clean self-sanitising evaporator that eliminates up to 99% of bacteria, and optional Wi-Fi control via the Bosch HomeCom Easy app — all in a compact, elegantly styled indoor unit measuring just 802 × 200 × 295 mm.

3.5 kW
Cooling Capacity
3.8 kW
Heating Capacity
SEER 7.0
A++ Cooling
SCOP 4.2
A+ Heating
20 dB
Silent Mode
Key Features & Benefits
DC Inverter Technology — Efficient & Responsive
Variable-speed DC inverter compressor continuously modulates output to match the exact heating or cooling load, eliminating the on/off cycling of fixed-speed units. The result is faster room temperature recovery, tighter temperature control (±0.5°C) and significantly lower electricity consumption — the rated 3.5 kW cooling capacity draws just 1,096 W at nominal load.
A++ Cooling / A+ Heating ErP Rating
With a SEER of 7.0 for cooling and SCOP of 4.2 for average-climate heating, the CL3000i meets and exceeds current EU ErP seasonal efficiency requirements. In warmer conditions, the SCOP rises to 5.5 (A+++ rated). This level of efficiency translates directly into lower energy bills versus older fixed-speed or lower-rated units.
Silent Mode — Indoor from 20 dB(A)
At its quietest setting, the indoor unit operates at just 20 dB(A) — quieter than a whispered conversation and virtually imperceptible in use. Three operating speeds are available (Hi/Mi/Lo: 37/32/22 dB(A)) alongside the dedicated Silent Mode, making this system genuinely suitable for bedrooms, home offices and noise-sensitive environments.
i-Clean Self-Sanitising Evaporator
Worcester Bosch's i-Clean function heats the evaporator coil to 56°C after use, destroying bacteria, mould spores and other biological contaminants that would otherwise accumulate on the heat exchanger surface. This keeps the unit hygienic between service visits and eliminates up to 99% of bacteria — ensuring only clean, fresh air is circulated into the room.
Double Filtration — Air Purification as Standard
A dual-stage filtration system captures airborne particulates and neutralises odours, harmful gases and volatile organic compounds (VOCs) before they reach the room. The filter is washable and reusable, reducing maintenance costs and ensuring consistently clean air throughout the system's life.
Follow Me — Personalised Room Comfort
The Follow Me feature uses the temperature sensor built into the remote controller rather than the indoor unit sensor, so the system responds to the actual temperature at your location in the room. This is particularly effective in large open-plan spaces where the indoor unit may be some distance from the occupied zone.
Heating Down to -15°C Outdoor Temperature
The CL3000i maintains full heating performance down to -15°C outdoor ambient temperature, making it genuinely useful as a primary or supplementary heating source throughout UK winters. The wide operating range (-15°C to +50°C for cooling, -15°C to +24°C for heating) gives confidence in year-round reliability regardless of weather conditions.
Wi-Fi Control via Bosch HomeCom Easy App
With the optional Connect Key G10 CL-1 accessory, the CL3000i connects to the Bosch HomeCom Easy app for smartphone and tablet control from anywhere. Schedule operating times, adjust temperature setpoints, monitor energy usage and switch modes remotely — full remote management without a separate controller.
Corrosion-Resistant Outdoor Unit
The outdoor unit features a golden-fin anti-corrosion coating on the heat exchanger, providing protection against salt-laden air and atmospheric pollutants. This makes the system particularly suitable for coastal and urban UK locations and contributes to a long, low-maintenance service life.
R32 Low-GWP Refrigerant
Charged with R32 refrigerant (GWP 675) — approximately one third of the GWP of the R410A it replaces — the CL3000i aligns with the current EU F-Gas regulation trajectory towards lower-impact refrigerants. The hermetically sealed system contains just 0.65 kg of refrigerant.
Technical Specifications — CL3000i 3.5 kW (35 E)
Cooling Performance
Rated Cooling Capacity (min – nom – max) 3.5 kW (1.3 – 3.5 – 4.3 kW)
Cooling Power Input (nominal) 1,096 W (120 – 1,650 W)
Cooling Current Input (nominal) 4.76 A (0.5 – 7.2 A)
Seasonal Design Cooling Load (Pdesignc) 3.6 kW
SEER 7.0
Cooling Energy Efficiency Class A++
Heating Performance
Rated Heating Capacity (min – nom – max) 3.8 kW (1.1 – 3.8 – 4.4 kW)
Heating Power Input (nominal) 1,027 W (110 – 1,480 W)
Heating Current Input (nominal) 4.46 A (0.5 – 6.4 A)
Seasonal Design Heating Load — Average Climate (Pdesignh) 2.5 kW
SCOP — Average Climate 4.2 (A+ rated)
SCOP — Warmer Climate 5.5 (A+++ rated)
Balance Point Temperature (Tbiv) -7°C (average) / +2°C (warmer)
Heating Operating Range (outdoor) -15°C to +24°C
Electrical Supply
Power Supply 220–240 V, 1-Phase, 50 Hz
Indoor Unit — CL3000iU W 35 E
Dimensions (W × D × H) 802 × 200 × 295 mm
Net / Gross Weight 8.7 kg / 11.5 kg
Airflow Volume (Hi / Mi / Lo) 530 / 400 / 350 m³/h
Sound Pressure Level (Hi / Mi / Lo / Silent) 37 / 32 / 22 / 20 dB(A)
Sound Power Level 56 dB(A)
Part Number 7-733-701-566
Outdoor Unit — CL3000i 35 E
Dimensions (W × D × H) 720 × 270 × 495 mm
Net / Gross Weight 23.7 kg / 25.5 kg
Airflow Volume 1,850 m³/h
Sound Pressure Level 55.0 dB(A)
Sound Power Level 63.0 dB(A)
Part Number 7-733-701-567
Refrigerant Circuit
Refrigerant Type R32
GWP 675
Refrigerant Charge 0.65 kg
Design Pressure (high / low) 4.3 MPa / 1.7 MPa
Liquid Pipe Diameter 6.35 mm (¼")
Gas Pipe Diameter 9.52 mm (⅜")
Maximum Pipe Length 25 m
Maximum Height Difference (indoor/outdoor) 10 m
Additional Refrigerant Charge (beyond 5 m) 12 g/m
Operating Conditions
Indoor Cooling / Heating Temperature Range 17–32°C / 0–30°C
Outdoor Cooling Temperature Range -15°C to +50°C
Outdoor Heating Temperature Range -15°C to +24°C
Kit Part Number
BOM (complete set) 7733701736
ℹ F-Gas Qualified Installation Required: This system contains fluorinated greenhouse gases (R32) and must be installed, commissioned and serviced by an F-Gas registered engineer. Electrical connection must be carried out by a qualified electrician. Wi-Fi control requires the optional Connect Key G10 CL-1 (sold separately). A 3-port valve is not required for single-split operation.
Frequently Asked Questions
Can the CL3000i heat as well as cool?
Yes — it is a reversible single split air-to-air heat pump. In heating mode it delivers 3.8 kW of heat output with a SCOP of 4.2, meaning it produces approximately 4.2 kW of heat for every 1 kW of electricity consumed. It continues to heat effectively down to -15°C outdoor temperature, making it a viable primary or supplementary heat source throughout the UK winter.
What room size is the 3.5 kW system suitable for?
As a general guide, a 3.5 kW cooling capacity is appropriate for rooms of approximately 25–40 m² depending on insulation quality, glazing area, solar exposure and occupancy. For an accurate sizing calculation, use our BTU calculator or speak to an F-Gas installer who can carry out a full heat loss assessment. The system is rated for indoor temperatures between 17–32°C (cooling) and 0–30°C (heating).
How do I control it — is there a smartphone app?
The unit comes with an infrared remote controller as standard. For smartphone control, the optional Connect Key G10 CL-1 accessory (sold separately) adds Wi-Fi connectivity and enables full control via the Bosch HomeCom Easy app on iOS and Android — including scheduling, temperature adjustment, mode changes and energy monitoring from anywhere.
What does i-Clean actually do?
After a cooling or heating cycle, the i-Clean function runs a self-drying and sanitising cycle on the indoor evaporator coil. The evaporator is heated to 56°C, which kills bacteria, mould and other biological contaminants that would otherwise grow on the damp heat exchanger surface between uses. This maintains hygiene and prevents the musty odours that can develop in uncleaned air conditioning units, and is claimed to eliminate up to 99% of bacteria.
Is professional installation required — can I install it myself?
Installation must be carried out by an F-Gas registered engineer because the system is pre-charged with R32 refrigerant, which is a regulated fluorinated greenhouse gas. Only F-Gas certified contractors are legally permitted to handle, transfer and top up refrigerant under UK and EU F-Gas Regulation. The electrical supply connection must also be carried out by a qualified electrician. Attempting DIY installation will void the manufacturer's warranty and may be unlawful.
Related Products
Worcester Bosch CL3000i 2.6 kW
For smaller rooms up to ~25 m²
Worcester Bosch CL3000i 5.3 kW
For larger rooms up to ~50 m²
Bosch Connect Key G10 CL-1
Wi-Fi accessory for HomeCom Easy app

Product Information

Shipping & Returns

Description

3.5 kW Cooling 3.8 kW Heating A++ Cooling (SEER 7.0) A+ Heating (SCOP 4.2) R32 Refrigerant Silent Mode 20 dB(A) DC Inverter Wi-Fi Ready i-Clean Self-Cleaning

The Worcester Bosch Climate CL3000i 3.5 kW single split system (indoor unit CL3000iU W 35 E + outdoor unit CL3000i 35 E) is a reversible air-to-air heat pump that delivers both cooling and heating from a single wall-mounted unit — making it one of the most versatile comfort solutions for UK homes and small commercial spaces. With a SEER of 7.0 (A++ cooling) and SCOP of 4.2 (A+ heating), it provides year-round climate control at significantly lower running costs than conventional electric heating. The system combines whisper-quiet Silent Mode operation from just 20 dB(A), an intelligent i-Clean self-sanitising evaporator that eliminates up to 99% of bacteria, and optional Wi-Fi control via the Bosch HomeCom Easy app — all in a compact, elegantly styled indoor unit measuring just 802 × 200 × 295 mm.

3.5 kW
Cooling Capacity
3.8 kW
Heating Capacity
SEER 7.0
A++ Cooling
SCOP 4.2
A+ Heating
20 dB
Silent Mode
Key Features & Benefits
DC Inverter Technology — Efficient & Responsive
Variable-speed DC inverter compressor continuously modulates output to match the exact heating or cooling load, eliminating the on/off cycling of fixed-speed units. The result is faster room temperature recovery, tighter temperature control (±0.5°C) and significantly lower electricity consumption — the rated 3.5 kW cooling capacity draws just 1,096 W at nominal load.
A++ Cooling / A+ Heating ErP Rating
With a SEER of 7.0 for cooling and SCOP of 4.2 for average-climate heating, the CL3000i meets and exceeds current EU ErP seasonal efficiency requirements. In warmer conditions, the SCOP rises to 5.5 (A+++ rated). This level of efficiency translates directly into lower energy bills versus older fixed-speed or lower-rated units.
Silent Mode — Indoor from 20 dB(A)
At its quietest setting, the indoor unit operates at just 20 dB(A) — quieter than a whispered conversation and virtually imperceptible in use. Three operating speeds are available (Hi/Mi/Lo: 37/32/22 dB(A)) alongside the dedicated Silent Mode, making this system genuinely suitable for bedrooms, home offices and noise-sensitive environments.
i-Clean Self-Sanitising Evaporator
Worcester Bosch's i-Clean function heats the evaporator coil to 56°C after use, destroying bacteria, mould spores and other biological contaminants that would otherwise accumulate on the heat exchanger surface. This keeps the unit hygienic between service visits and eliminates up to 99% of bacteria — ensuring only clean, fresh air is circulated into the room.
Double Filtration — Air Purification as Standard
A dual-stage filtration system captures airborne particulates and neutralises odours, harmful gases and volatile organic compounds (VOCs) before they reach the room. The filter is washable and reusable, reducing maintenance costs and ensuring consistently clean air throughout the system's life.
Follow Me — Personalised Room Comfort
The Follow Me feature uses the temperature sensor built into the remote controller rather than the indoor unit sensor, so the system responds to the actual temperature at your location in the room. This is particularly effective in large open-plan spaces where the indoor unit may be some distance from the occupied zone.
Heating Down to -15°C Outdoor Temperature
The CL3000i maintains full heating performance down to -15°C outdoor ambient temperature, making it genuinely useful as a primary or supplementary heating source throughout UK winters. The wide operating range (-15°C to +50°C for cooling, -15°C to +24°C for heating) gives confidence in year-round reliability regardless of weather conditions.
Wi-Fi Control via Bosch HomeCom Easy App
With the optional Connect Key G10 CL-1 accessory, the CL3000i connects to the Bosch HomeCom Easy app for smartphone and tablet control from anywhere. Schedule operating times, adjust temperature setpoints, monitor energy usage and switch modes remotely — full remote management without a separate controller.
Corrosion-Resistant Outdoor Unit
The outdoor unit features a golden-fin anti-corrosion coating on the heat exchanger, providing protection against salt-laden air and atmospheric pollutants. This makes the system particularly suitable for coastal and urban UK locations and contributes to a long, low-maintenance service life.
R32 Low-GWP Refrigerant
Charged with R32 refrigerant (GWP 675) — approximately one third of the GWP of the R410A it replaces — the CL3000i aligns with the current EU F-Gas regulation trajectory towards lower-impact refrigerants. The hermetically sealed system contains just 0.65 kg of refrigerant.
Technical Specifications — CL3000i 3.5 kW (35 E)
Cooling Performance
Rated Cooling Capacity (min – nom – max) 3.5 kW (1.3 – 3.5 – 4.3 kW)
Cooling Power Input (nominal) 1,096 W (120 – 1,650 W)
Cooling Current Input (nominal) 4.76 A (0.5 – 7.2 A)
Seasonal Design Cooling Load (Pdesignc) 3.6 kW
SEER 7.0
Cooling Energy Efficiency Class A++
Heating Performance
Rated Heating Capacity (min – nom – max) 3.8 kW (1.1 – 3.8 – 4.4 kW)
Heating Power Input (nominal) 1,027 W (110 – 1,480 W)
Heating Current Input (nominal) 4.46 A (0.5 – 6.4 A)
Seasonal Design Heating Load — Average Climate (Pdesignh) 2.5 kW
SCOP — Average Climate 4.2 (A+ rated)
SCOP — Warmer Climate 5.5 (A+++ rated)
Balance Point Temperature (Tbiv) -7°C (average) / +2°C (warmer)
Heating Operating Range (outdoor) -15°C to +24°C
Electrical Supply
Power Supply 220–240 V, 1-Phase, 50 Hz
Indoor Unit — CL3000iU W 35 E
Dimensions (W × D × H) 802 × 200 × 295 mm
Net / Gross Weight 8.7 kg / 11.5 kg
Airflow Volume (Hi / Mi / Lo) 530 / 400 / 350 m³/h
Sound Pressure Level (Hi / Mi / Lo / Silent) 37 / 32 / 22 / 20 dB(A)
Sound Power Level 56 dB(A)
Part Number 7-733-701-566
Outdoor Unit — CL3000i 35 E
Dimensions (W × D × H) 720 × 270 × 495 mm
Net / Gross Weight 23.7 kg / 25.5 kg
Airflow Volume 1,850 m³/h
Sound Pressure Level 55.0 dB(A)
Sound Power Level 63.0 dB(A)
Part Number 7-733-701-567
Refrigerant Circuit
Refrigerant Type R32
GWP 675
Refrigerant Charge 0.65 kg
Design Pressure (high / low) 4.3 MPa / 1.7 MPa
Liquid Pipe Diameter 6.35 mm (¼")
Gas Pipe Diameter 9.52 mm (⅜")
Maximum Pipe Length 25 m
Maximum Height Difference (indoor/outdoor) 10 m
Additional Refrigerant Charge (beyond 5 m) 12 g/m
Operating Conditions
Indoor Cooling / Heating Temperature Range 17–32°C / 0–30°C
Outdoor Cooling Temperature Range -15°C to +50°C
Outdoor Heating Temperature Range -15°C to +24°C
Kit Part Number
BOM (complete set) 7733701736
ℹ F-Gas Qualified Installation Required: This system contains fluorinated greenhouse gases (R32) and must be installed, commissioned and serviced by an F-Gas registered engineer. Electrical connection must be carried out by a qualified electrician. Wi-Fi control requires the optional Connect Key G10 CL-1 (sold separately). A 3-port valve is not required for single-split operation.
Frequently Asked Questions
Can the CL3000i heat as well as cool?
Yes — it is a reversible single split air-to-air heat pump. In heating mode it delivers 3.8 kW of heat output with a SCOP of 4.2, meaning it produces approximately 4.2 kW of heat for every 1 kW of electricity consumed. It continues to heat effectively down to -15°C outdoor temperature, making it a viable primary or supplementary heat source throughout the UK winter.
What room size is the 3.5 kW system suitable for?
As a general guide, a 3.5 kW cooling capacity is appropriate for rooms of approximately 25–40 m² depending on insulation quality, glazing area, solar exposure and occupancy. For an accurate sizing calculation, use our BTU calculator or speak to an F-Gas installer who can carry out a full heat loss assessment. The system is rated for indoor temperatures between 17–32°C (cooling) and 0–30°C (heating).
How do I control it — is there a smartphone app?
The unit comes with an infrared remote controller as standard. For smartphone control, the optional Connect Key G10 CL-1 accessory (sold separately) adds Wi-Fi connectivity and enables full control via the Bosch HomeCom Easy app on iOS and Android — including scheduling, temperature adjustment, mode changes and energy monitoring from anywhere.
What does i-Clean actually do?
After a cooling or heating cycle, the i-Clean function runs a self-drying and sanitising cycle on the indoor evaporator coil. The evaporator is heated to 56°C, which kills bacteria, mould and other biological contaminants that would otherwise grow on the damp heat exchanger surface between uses. This maintains hygiene and prevents the musty odours that can develop in uncleaned air conditioning units, and is claimed to eliminate up to 99% of bacteria.
Is professional installation required — can I install it myself?
Installation must be carried out by an F-Gas registered engineer because the system is pre-charged with R32 refrigerant, which is a regulated fluorinated greenhouse gas. Only F-Gas certified contractors are legally permitted to handle, transfer and top up refrigerant under UK and EU F-Gas Regulation. The electrical supply connection must also be carried out by a qualified electrician. Attempting DIY installation will void the manufacturer's warranty and may be unlawful.
Related Products
Worcester Bosch CL3000i 2.6 kW
For smaller rooms up to ~25 m²
Worcester Bosch CL3000i 5.3 kW
For larger rooms up to ~50 m²
Bosch Connect Key G10 CL-1
Wi-Fi accessory for HomeCom Easy app

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Eurom AC3201E 3200 BTU R290 Split Portable Air Conditioner – Compact, Efficient Cooling for Caravans and Camper Vans

$817.90

NEW
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Eurom 18000 BTU Mobile Air Conditioner and Heating Unit | 5200W Cooling, Wi-Fi, R290 | Powerful Year-Round Climate Control

$1,187.71

-65%NEW
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Eurom PAC 12000 BTU Compact Portable Air Conditioner, Dehumidifier & Fan | Wi-Fi, Class A

$570.91

$199.82

-65%NEW
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Haier 7kW Round Flow Cassette Air Conditioner Kit – 360° Ceiling Cassette, for Offices & Retail

$3,067.80

$1,073.73

-65%NEW
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Haier Revive Plus 5.0kW Wall Mounted Monosplit Air Conditioner Kit AS50RCBHRA-4 – A++ R32 Heat Pump Split System

$1,464.39

$512.54

-65%NEW
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Haier 2.5kW Light Commercial Cassette Air Conditioner Kit – Ceiling Cassette, Outdoor Condensing Unit & Wall Controller (R32)

$2,004.26

$701.49

-65%NEW
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Haier 3.5kW Light Commercial Cassette Air Conditioner Kit – Ceiling Cassette, Outdoor Condensing Unit & Wall Controller (R32)

$2,205.36

$771.88

-65%NEW
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Haier 5kW Light Commercial Cassette Air Conditioner Kit – Ceiling Cassette, Outdoor Condensing Unit & Wall Controller (R32)

$2,606.21

$912.17

-65%NEW
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Haier Revive Plus 3.5kW Wall Mounted Monosplit Air Conditioner Kit AS35RBAHRA-4 – A++ R32 Heat Pump Split System

$1,033.85

$361.85

-65%NEW
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Haier 10.5kW Round Flow Cassette Air Conditioner Kit – 360° Ceiling Cassette, 10.5kW Outdoor Condensing Unit & Wall Controller

$3,962.63

$1,386.92

-65%NEW
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Haier Revive plus Air Conditioner Kit Wall Mounted Monosplit Air to Air Source Heat Pump 2.7kW

$917.78

$321.22

Worcester Bosch Climate CL3000i 3.5kW Single Split Air Conditioning System – Heating & Cooling A++ Rated R3 | AIZO Quality Heating