LG MU3R21.U24A0 6.2kW Triple-Port Multi-Split Outdoor Unit
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Upgrade your home climate control with the LG MU3R21.U24A0, a powerful triple-port outdoor unit capable of supporting up to three indoor units. This system is perfect for larger residential properties or multi-room configurations, allowing for independent climate management in three separate zones. By utilizing a single outdoor unit, you reduce exterior clutter while maintaining high-performance cooling and heating. The unit features LG’s signature smart load control, which automatically adjusts refrigerant temperature based on external conditions to maximize energy savings. With its A++ energy rating and quiet inverter technology, it provides a cost-effective and comfortable environment throughout the year. The unit is built to withstand the UK's variable weather, featuring a durable, corrosion-resistant finish. Whether you are cooling a living room, kitchen, and bedroom, or heating multiple areas during winter, this multi-split system offers the flexibility and reliability required for modern, energy-conscious households.
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We'll match you with a local HVAC engineer.
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
Technical documents & videos
More from LG →Official LG manual
The manufacturer's PDF for this model is being sourced and will be downloadable here.
Full Specifications
Description
Upgrade your home climate control with the LG MU3R21.U24A0, a powerful triple-port outdoor unit capable of supporting up to three indoor units. This system is perfect for larger residential properties or multi-room configurations, allowing for independent climate management in three separate zones. By utilizing a single outdoor unit, you reduce exterior clutter while maintaining high-performance cooling and heating. The unit features LG’s signature smart load control, which automatically adjusts refrigerant temperature based on external conditions to maximize energy savings. With its A++ energy rating and quiet inverter technology, it provides a cost-effective and comfortable environment throughout the year. The unit is built to withstand the UK's variable weather, featuring a durable, corrosion-resistant finish. Whether you are cooling a living room, kitchen, and bedroom, or heating multiple areas during winter, this multi-split system offers the flexibility and reliability required for modern, energy-conscious households.
Compare similar units
Side-by-side specs for other multi-split system ac in a similar BTU range.
Common questions about the LG MU3R21.U24A0 6.2kW Triple-Port Multi-Split Outdoor Unit
How many BTU is the LG MU3R21.U24A0 6.2kW Triple-Port Multi-Split Outdoor Unit?
The LG MU3R21.U24A0 6.2kW Triple-Port Multi-Split Outdoor Unit has a cooling capacity of 21,000 BTU, suitable for Up to 75m² total.
What room size is the LG MU3R21.U24A0 6.2kW Triple-Port Multi-Split Outdoor Unit suitable for?
The LG MU3R21.U24A0 6.2kW Triple-Port Multi-Split Outdoor Unit is recommended for rooms Up to 75m² total.
Can I install the LG MU3R21.U24A0 6.2kW Triple-Port Multi-Split Outdoor Unit myself?
No — this unit requires professional installation by a qualified F-gas engineer. Use our Find an Installer service to get matched with a local HVAC professional.
Is the LG MU3R21.U24A0 6.2kW Triple-Port Multi-Split Outdoor Unit smart-home compatible?
Yes — the LG MU3R21.U24A0 6.2kW Triple-Port Multi-Split Outdoor Unit supports Google Home, Amazon Alexa for app and voice control.
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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
170 kWh/yr
EER 13
Standard model
277 kWh/yr
EER 8
Est. saving
£28.76
107 kWh/yr less
Estimate based on the unit's energy-rating efficiency factor and cooling capacity (21,000 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 7 kW heat output used 5 hrs/day over a 150-day UK heating season at £0.27/kWh.
Electric heater / season
£1365
This AC / season
£455
You save / season
£910
~67% less electricity
| Heating method | Electricity / season | Cost / season | Efficiency | Summer cooling |
|---|---|---|---|---|
| This heat-pump AC | 1685 kWh | £455 | Up to 300% | |
| Plug-in electric heater | 5056 kWh | £1365 | 100% | |
| Electric storage heater | 5056 kWh | £1365 | 100% |
Heat output estimated from this unit's 23,000 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 £455/season to heat a room vs £1365 for an electric heater - that's £910 saved. https://stockool.store/products/lg-mu3r21-u24a0-6-2kw-triple-port-multi-split-outdoor-unit
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