Rinnai PX Series 3.5kW Wall Mounted Inverter Split System
Available to order — dispatched on the lead time shown below.
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Retail prices include VAT.
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.
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 Rinnai →Full Specifications
Physical dimensions
Exact dimensions for this model are being confirmed with Rinnai — ask us and we will send the cut sheet with mounting and clearance figures.
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.
Compare similar units
Side-by-side specs for other split system ac in a similar BTU range.
Common questions about the Rinnai PX Series 3.5kW Wall Mounted Inverter Split System
How many BTU is the Rinnai PX Series 3.5kW Wall Mounted Inverter Split System?
The Rinnai PX Series 3.5kW Wall Mounted Inverter Split System has a cooling capacity of 12,000 BTU, suitable for Up to 28m².
What room size is the Rinnai PX Series 3.5kW Wall Mounted Inverter Split System suitable for?
The Rinnai PX Series 3.5kW Wall Mounted Inverter Split System is recommended for rooms Up to 28m².
Can I install the Rinnai PX Series 3.5kW Wall Mounted Inverter 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 Rinnai PX Series 3.5kW Wall Mounted Inverter Split System smart-home compatible?
Yes — the Rinnai PX Series 3.5kW Wall Mounted Inverter Split System supports Amazon Alexa, Google Home for app and voice control.
How long does delivery of the Rinnai PX Series 3.5kW Wall Mounted Inverter 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
97 kWh/yr
EER 13
Standard model
158 kWh/yr
EER 8
Est. saving
£16.44
61 kWh/yr less
Estimate based on the unit's energy-rating efficiency factor and cooling capacity (12,000 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 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 →
Share your savings
This heat-pump AC costs only £257/season to heat a room vs £772 for an electric heater - that's £514 saved. https://stockool.store/products/rinnai-px-series-3-5kw-wall-mounted-inverter-split-system
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