Hitachi airHome 400 5.0kW High Capacity Wall Split System
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Engineered for substantial residential spaces, open-plan kitchen diners, and commercial suites up to 50m², the Hitachi airHome 400 5.0kW split system delivers a powerful 18,000 BTU cooling duty and robust reverse-cycle heating. It keeps larger spaces pleasantly tempered throughout the British winter and crisp and cool during peak summer heatwaves. Featuring advanced FrostWash coil-sanitising automation and specialised multi-stage filtration, the unit maintains high airflow throughput and ensures clean, allergen-free indoor air. Integrated airCloud Go connectivity allows effortless remote monitoring, presence detection, and compatibility with Google Home and Amazon Alexa smart setups. Designed for permanent professional F-Gas installation, the durable outdoor condenser pairs seamlessly with the high-specification indoor unit, offering A++ energy efficiency, whispering quiet performance modes, and exceptional Hitachi Japanese engineering reliability backed by a 5-year parts warranty.
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 Hitachi →Official Hitachi manual
The manufacturer's PDF for this model is being sourced and will be downloadable here.
Full Model Line Catalogue
Hitachi catalogue — open the official flipbook in a new tab.
Full Specifications
Physical dimensions
Exact dimensions for this model are being confirmed with Hitachi — ask us and we will send the cut sheet with mounting and clearance figures.
Description
Engineered for substantial residential spaces, open-plan kitchen diners, and commercial suites up to 50m², the Hitachi airHome 400 5.0kW split system delivers a powerful 18,000 BTU cooling duty and robust reverse-cycle heating. It keeps larger spaces pleasantly tempered throughout the British winter and crisp and cool during peak summer heatwaves. Featuring advanced FrostWash coil-sanitising automation and specialised multi-stage filtration, the unit maintains high airflow throughput and ensures clean, allergen-free indoor air. Integrated airCloud Go connectivity allows effortless remote monitoring, presence detection, and compatibility with Google Home and Amazon Alexa smart setups. Designed for permanent professional F-Gas installation, the durable outdoor condenser pairs seamlessly with the high-specification indoor unit, offering A++ energy efficiency, whispering quiet performance modes, and exceptional Hitachi Japanese engineering reliability backed by a 5-year parts warranty.
Compare similar units
Side-by-side specs for other split system ac in a similar BTU range.
Common questions about the Hitachi airHome 400 5.0kW High Capacity Wall Split System
How many BTU is the Hitachi airHome 400 5.0kW High Capacity Wall Split System?
The Hitachi airHome 400 5.0kW High Capacity Wall Split System has a cooling capacity of 18,000 BTU, suitable for Up to 50m².
What room size is the Hitachi airHome 400 5.0kW High Capacity Wall Split System suitable for?
The Hitachi airHome 400 5.0kW High Capacity Wall Split System is recommended for rooms Up to 50m².
Can I install the Hitachi airHome 400 5.0kW High Capacity Wall Split System 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 Hitachi airHome 400 5.0kW High Capacity Wall Split System smart-home compatible?
Yes — the Hitachi airHome 400 5.0kW High Capacity Wall Split System supports Amazon Alexa, Google Home for app and voice control.
How long does delivery of the Hitachi airHome 400 5.0kW High Capacity Wall Split System 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
146 kWh/yr
EER 13
Standard model
237 kWh/yr
EER 8
Est. saving
£24.65
91 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 6 kW heat output used 5 hrs/day over a 150-day UK heating season at £0.27/kWh.
Electric heater / season
£1217
This AC / season
£406
You save / season
£811
~67% less electricity
| Heating method | Electricity / season | Cost / season | Efficiency | Summer cooling |
|---|---|---|---|---|
| This heat-pump AC | 1502 kWh | £406 | Up to 300% | |
| Plug-in electric heater | 4506 kWh | £1217 | 100% | |
| Electric storage heater | 4506 kWh | £1217 | 100% |
Heat output estimated from this unit's 20,500 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 £406/season to heat a room vs £1217 for an electric heater - that's £811 saved. https://stockool.store/products/hitachi-airhome-400-5-0kw-high-capacity-wall-split-system
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