LG MU2R17.U21 4.7kW Multi-Split Outdoor Unit
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The LG MU2R17.U21 is a highly efficient 4.7kW multi-split outdoor unit designed to support two indoor units. This model strikes the perfect balance between power and energy efficiency, making it an excellent choice for modern apartments or smaller homes where space is at a premium. The dual inverter compressor ensures that the system operates quietly and effectively, providing rapid cooling during hot summer days and efficient heating during the colder months. Its compact footprint allows for easy installation on balconies or exterior walls, while the advanced control features allow you to manage your home climate via smartphone apps. This unit is built to last, featuring high-quality components that ensure consistent performance over many years. By choosing the MU2R17.U21, you are investing in a reliable, smart, and energy-efficient climate control system that enhances your living environment while keeping energy costs under control.
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Smart-home ready
Connects natively with the systems below — control by app or voice.
- Free UK mainland delivery on in-stock units
- Manufacturer warranty included
- 14-day returns
Downloads & specs
More from LG →Manufacturer instructions
Installation of the LG MU2R17.U21 multi-split outdoor unit must be performed by a certified F-gas technician. The unit should be mounted on a level, vibration-free surface with adequate clearance for airflow as specified in the technical manual. Refrigerant piping must be insulated, vacuum-tested to remove moisture, and checked for leaks before opening the service valves. Electrical connections require a dedicated power supply and proper grounding according to local regulations. Once installed, the system must be commissioned by verifying the communication wiring between the outdoor and indoor units and performing a test run to ensure correct operation. Safety protocols regarding high-pressure refrigerant handling must be strictly followed throughout the installation process. Refer to the specific product installation manual for exact torque settings and wiring diagrams.
Fixed units must be installed by a qualified F-gas engineer. Find an installer — we'll match you with a local HVAC professional.
Full Specifications
Description
The LG MU2R17.U21 is a highly efficient 4.7kW multi-split outdoor unit designed to support two indoor units. This model strikes the perfect balance between power and energy efficiency, making it an excellent choice for modern apartments or smaller homes where space is at a premium. The dual inverter compressor ensures that the system operates quietly and effectively, providing rapid cooling during hot summer days and efficient heating during the colder months. Its compact footprint allows for easy installation on balconies or exterior walls, while the advanced control features allow you to manage your home climate via smartphone apps. This unit is built to last, featuring high-quality components that ensure consistent performance over many years. By choosing the MU2R17.U21, you are investing in a reliable, smart, and energy-efficient climate control system that enhances your living environment while keeping energy costs under control.
Compare similar units
Side-by-side specs for other multi-split system ac in a similar BTU range.
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Mitsubishi ElectricAnnual energy savings estimate
How much this A++-rated unit could save versus a standard C-rated model, based on your usage.
This unit
130 kWh/yr
EER 13
Standard model
211 kWh/yr
EER 8
Est. saving
£21.91
81 kWh/yr less
Estimate based on the unit's energy-rating efficiency factor and cooling capacity (16,000 BTU). Actual savings vary with room size, climate and usage patterns.
Winter heating cost: this AC vs electric heaters
This unit reverses to heat your room in winter. Based on its 5 kW heat output used 5 hrs/day over a 150-day UK heating season at £0.27/kWh.
Electric heater / season
£1009
This AC / season
£336
You save / season
£673
~67% less electricity
| Heating method | Electricity / season | Cost / season | Efficiency | Summer cooling |
|---|---|---|---|---|
| This heat-pump AC | 1246 kWh | £336 | Up to 300% | |
| Plug-in electric heater | 3737 kWh | £1009 | 100% | |
| Electric storage heater | 3737 kWh | £1009 | 100% |
Heat output estimated from this unit's 17,000 BTU/hr rating. A heat pump moves heat (COP ≈ 3), so it uses about a third of the electricity of a direct-electric heater for the same warmth. Actual savings vary with room size, insulation, tariff and usage. See the full comparison →
Share your savings
This heat-pump AC costs only £336/season to heat a room vs £1009 for an electric heater - that's £673 saved. https://stockool.store/products/lg-mu2r17-u21-4-7kw-multi-split-outdoor-unit
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