Rinnai PX Series 3.5kW Wall Mounted Inverter Split System
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Experience superior indoor climate management with the Rinnai PX Series 3.5kW Wall Mounted Inverter Split System. Engineered for typical British open-plan living rooms, primary bedroom suites, and medium-sized spaces up to 28m², this reverse-cycle heat pump delivers 12,000 BTU of rapid cooling alongside 13,000 BTU of energy-efficient heating during colder winter months. Equipped with embedded Wi-Fi connectivity, the unit pairs seamlessly with Google Assistant and Amazon Alexa for hands-free temperature adjustments. The sleek curved fascia blends effortlessly into modern interiors, while the GoldGuard external coating shields the outdoor condenser from humid and coastal UK weather conditions. Ultra-efficient DC inverter technology dynamically adjusts compressor speed, lowering overall energy bills and maintaining stable room temperatures with whisper-quiet operational decibels.
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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
Full Specifications
Description
Experience superior indoor climate management with the Rinnai PX Series 3.5kW Wall Mounted Inverter Split System. Engineered for typical British open-plan living rooms, primary bedroom suites, and medium-sized spaces up to 28m², this reverse-cycle heat pump delivers 12,000 BTU of rapid cooling alongside 13,000 BTU of energy-efficient heating during colder winter months. Equipped with embedded Wi-Fi connectivity, the unit pairs seamlessly with Google Assistant and Amazon Alexa for hands-free temperature adjustments. The sleek curved fascia blends effortlessly into modern interiors, while the GoldGuard external coating shields the outdoor condenser from humid and coastal UK weather conditions. Ultra-efficient DC inverter technology dynamically adjusts compressor speed, lowering overall energy bills and maintaining stable room temperatures with whisper-quiet operational decibels.
Winter heating cost: this AC vs electric heaters
This unit reverses to heat your room in winter. Based on its 4 kW heat output used 5 hrs/day over a 150-day UK heating season at £0.27/kWh.
Electric heater / season
£772
This AC / season
£257
You save / season
£514
~67% less electricity
| Heating method | Electricity / season | Cost / season | Efficiency | Summer cooling |
|---|---|---|---|---|
| This heat-pump AC | 953 kWh | £257 | Up to 300% | |
| Plug-in electric heater | 2858 kWh | £772 | 100% | |
| Electric storage heater | 2858 kWh | £772 | 100% |
Heat output estimated from this unit's 13,000 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 →