Daikin 3MXM52A9 Multi-Split Outdoor Unit
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The Daikin 3MXM52A9 is a robust, three-port multi-split outdoor unit engineered for larger residential applications where individual climate control is required across three separate rooms. This powerful inverter heat pump allows for the connection of up to three indoor units, which can be controlled independently to suit the specific needs of each space. With seasonal efficiency ratings reaching A+++ for cooling and A++ for heating, it is one of the most energy-efficient solutions available for UK homeowners. The unit is designed to operate seamlessly in the UK climate, providing reliable heating even when temperatures drop. Its intelligent inverter technology continuously adjusts compressor speed to match demand, preventing energy waste and maintaining a stable, comfortable environment. Ideal for multi-room setups, this system offers the flexibility to mix and match indoor unit styles, such as wall-mounted units or concealed ceiling units, ensuring your air conditioning system integrates perfectly with your home's interior design.
Need it installed?
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 Daikin →Full Specifications
Physical dimensions
Exact dimensions for this model are being confirmed with Daikin — ask us and we will send the cut sheet with mounting and clearance figures.
Description
The Daikin 3MXM52A9 is a robust, three-port multi-split outdoor unit engineered for larger residential applications where individual climate control is required across three separate rooms. This powerful inverter heat pump allows for the connection of up to three indoor units, which can be controlled independently to suit the specific needs of each space. With seasonal efficiency ratings reaching A+++ for cooling and A++ for heating, it is one of the most energy-efficient solutions available for UK homeowners. The unit is designed to operate seamlessly in the UK climate, providing reliable heating even when temperatures drop. Its intelligent inverter technology continuously adjusts compressor speed to match demand, preventing energy waste and maintaining a stable, comfortable environment. Ideal for multi-room setups, this system offers the flexibility to mix and match indoor unit styles, such as wall-mounted units or concealed ceiling units, ensuring your air conditioning system integrates perfectly with your home's interior design.
Compare similar units
Side-by-side specs for other multi-split system ac in a similar BTU range.
Common questions about the Daikin 3MXM52A9 Multi-Split Outdoor Unit
How many BTU is the Daikin 3MXM52A9 Multi-Split Outdoor Unit?
The Daikin 3MXM52A9 Multi-Split Outdoor Unit has a cooling capacity of 18,000 BTU, suitable for Up to 52m².
What room size is the Daikin 3MXM52A9 Multi-Split Outdoor Unit suitable for?
The Daikin 3MXM52A9 Multi-Split Outdoor Unit is recommended for rooms Up to 52m².
Can I install the Daikin 3MXM52A9 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 Daikin 3MXM52A9 Multi-Split Outdoor Unit smart-home compatible?
Yes — the Daikin 3MXM52A9 Multi-Split Outdoor Unit supports Amazon Alexa, Google Home for app and voice control.
How long does delivery of the Daikin 3MXM52A9 Multi-Split Outdoor Unit take?
This unit is dispatched in 2-3 working days. Delivery is then 1–2 working days to most UK mainland addresses, and 3–6 working days into the EU.
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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
136 kWh/yr
EER 14
Standard model
237 kWh/yr
EER 8
Est. saving
£27.47
102 kWh/yr less
Estimate based on the unit's energy-rating efficiency factor and cooling capacity (18,000 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
£1377
This AC / season
£459
You save / season
£918
~67% less electricity
| Heating method | Electricity / season | Cost / season | Efficiency | Summer cooling |
|---|---|---|---|---|
| This heat-pump AC | 1700 kWh | £459 | Up to 300% | |
| Plug-in electric heater | 5100 kWh | £1377 | 100% | |
| Electric storage heater | 5100 kWh | £1377 | 100% |
Heat output estimated from this unit's 23,200 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 £459/season to heat a room vs £1377 for an electric heater - that's £918 saved. https://stockool.store/products/daikin-3mxm52a9-multi-split-outdoor-unit
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