Viessmann Vitoclima 300-S Kombi 5.3kW Dual-Zone Multi Split Outdoor Unit
Available to order — dispatched on the lead time shown below.
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Retail prices include VAT.
Engineered for optimal comfort, the Viessmann Vitoclima 300-S Kombi 5.3kW multi split outdoor condenser delivers dependable twin-room climate management. This system connects up to two high-wall or cassette indoor units, giving you autonomous thermal scheduling across multiple zones. Powered by a high-efficiency DC inverter compressor, it delivers seamless variable capacity control to ensure quiet running, stable room temperatures, and reduced electricity consumption. The unit features eco-friendly R32 refrigerant alongside an intelligent heat pump reversing cycle capable of providing reliable, rapid heating even when ambient outdoor temperatures plunge down to -15°C. With robust German engineering standards and protective gold-fin coating on the condenser coil, it is specifically built to withstand challenging UK coastal and humid weather conditions.
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 Viessmann →Official Viessmann manual
The manufacturer's PDF for this model is being sourced and will be downloadable here.
Full Specifications
Physical dimensions
Exact dimensions for this model are being confirmed with Viessmann — ask us and we will send the cut sheet with mounting and clearance figures.
Description
Engineered for optimal comfort, the Viessmann Vitoclima 300-S Kombi 5.3kW multi split outdoor condenser delivers dependable twin-room climate management. This system connects up to two high-wall or cassette indoor units, giving you autonomous thermal scheduling across multiple zones. Powered by a high-efficiency DC inverter compressor, it delivers seamless variable capacity control to ensure quiet running, stable room temperatures, and reduced electricity consumption. The unit features eco-friendly R32 refrigerant alongside an intelligent heat pump reversing cycle capable of providing reliable, rapid heating even when ambient outdoor temperatures plunge down to -15°C. With robust German engineering standards and protective gold-fin coating on the condenser coil, it is specifically built to withstand challenging UK coastal and humid weather conditions.
Compare similar units
Side-by-side specs for other multi-split system ac in a similar BTU range.
Common questions about the Viessmann Vitoclima 300-S Kombi 5.3kW Dual-Zone Multi Split Outdoor Unit
How many BTU is the Viessmann Vitoclima 300-S Kombi 5.3kW Dual-Zone Multi Split Outdoor Unit?
The Viessmann Vitoclima 300-S Kombi 5.3kW Dual-Zone Multi Split Outdoor Unit has a cooling capacity of 18,000 BTU, suitable for Up to 55m² total across 2 rooms.
What room size is the Viessmann Vitoclima 300-S Kombi 5.3kW Dual-Zone Multi Split Outdoor Unit suitable for?
The Viessmann Vitoclima 300-S Kombi 5.3kW Dual-Zone Multi Split Outdoor Unit is recommended for rooms Up to 55m² total across 2 rooms.
Can I install the Viessmann Vitoclima 300-S Kombi 5.3kW Dual-Zone 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 Viessmann Vitoclima 300-S Kombi 5.3kW Dual-Zone Multi Split Outdoor Unit smart-home compatible?
Yes — the Viessmann Vitoclima 300-S Kombi 5.3kW Dual-Zone Multi Split Outdoor Unit supports Amazon Alexa, Google Home for app and voice control.
How long does delivery of the Viessmann Vitoclima 300-S Kombi 5.3kW Dual-Zone 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
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
£1157
This AC / season
£386
You save / season
£772
~67% less electricity
| Heating method | Electricity / season | Cost / season | Efficiency | Summer cooling |
|---|---|---|---|---|
| This heat-pump AC | 1429 kWh | £386 | Up to 300% | |
| Plug-in electric heater | 4286 kWh | £1157 | 100% | |
| Electric storage heater | 4286 kWh | £1157 | 100% |
Heat output estimated from this unit's 19,500 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 £386/season to heat a room vs £1157 for an electric heater - that's £772 saved. https://stockool.store/products/viessmann-vitoclima-300-s-kombi-5-3kw-dual-zone-multi-split-outdoor-unit
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