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.
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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
Specifications
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.
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 →