LG MU4R25.U42 7.0kW Multi-Split Outdoor Unit
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Designed for larger residential properties, the LG MU4R25.U42 7.0kW multi-split outdoor unit provides the power to connect up to four indoor units. This robust system is ideal for families who want to maintain different temperatures in various rooms, such as a living room, master bedroom, and guest rooms, all from a single, efficient outdoor source. The dual inverter compressor provides superior energy efficiency, helping to lower electricity bills while maintaining a consistent, comfortable environment. Its advanced control system allows for precise adjustments, ensuring that each room is cooled or heated exactly as needed. The unit is built to withstand the UK climate, featuring a corrosion-resistant finish and quiet operation technology. By consolidating your air conditioning needs into one unit, you save valuable outdoor space and simplify maintenance. This model is a top-tier choice for those who demand performance, reliability, and smart connectivity in their home climate control system.
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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 MU4R25.U42 multi-split outdoor unit must be performed exclusively by authorized HVAC personnel in accordance with national wiring and safety standards. The unit requires a stable, level mounting surface with adequate clearance for airflow. Refrigerant piping must be connected to the designated ports, ensuring proper insulation and leak testing. Electrical connections must follow the provided wiring diagrams, ensuring correct power supply and grounding. The system requires a vacuum process to remove moisture and air from the lines before opening the service valves to release refrigerant. F-gas regulations must be strictly observed during handling and charging. Once installed, perform a test run to verify system operation, check for vibrations, and ensure all indoor units communicate correctly with the outdoor unit. Refer to the specific installation manual for detailed torque settings and dip switch configurations.
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
Designed for larger residential properties, the LG MU4R25.U42 7.0kW multi-split outdoor unit provides the power to connect up to four indoor units. This robust system is ideal for families who want to maintain different temperatures in various rooms, such as a living room, master bedroom, and guest rooms, all from a single, efficient outdoor source. The dual inverter compressor provides superior energy efficiency, helping to lower electricity bills while maintaining a consistent, comfortable environment. Its advanced control system allows for precise adjustments, ensuring that each room is cooled or heated exactly as needed. The unit is built to withstand the UK climate, featuring a corrosion-resistant finish and quiet operation technology. By consolidating your air conditioning needs into one unit, you save valuable outdoor space and simplify maintenance. This model is a top-tier choice for those who demand performance, reliability, and smart connectivity in their home climate control system.
Compare similar units
Side-by-side specs for other multi-split system ac in a similar BTU range.
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Stiebel Eltron
BroughtonReznor
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ClarkeBeldrayVYtronIXCostwaySuntec
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AUX
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NIBE
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Carrier
Toshiba
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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
195 kWh/yr
EER 13
Standard model
317 kWh/yr
EER 8
Est. saving
£32.87
122 kWh/yr less
Estimate based on the unit's energy-rating efficiency factor and cooling capacity (24,000 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 8 kW heat output used 5 hrs/day over a 150-day UK heating season at £0.27/kWh.
Electric heater / season
£1543
This AC / season
£514
You save / season
£1029
~67% less electricity
| Heating method | Electricity / season | Cost / season | Efficiency | Summer cooling |
|---|---|---|---|---|
| This heat-pump AC | 1905 kWh | £514 | Up to 300% | |
| Plug-in electric heater | 5715 kWh | £1543 | 100% | |
| Electric storage heater | 5715 kWh | £1543 | 100% |
Heat output estimated from this unit's 26,000 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 £514/season to heat a room vs £1543 for an electric heater - that's £1029 saved. https://stockool.store/products/lg-mu4r25-u42-7-0kw-multi-split-outdoor-unit
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