UK portable AC stock crisis: Meaco & Midea portable units face industry-wide dispatch delays of several weeks to months. Split, multi-split, window, cassette & accessory lines are unaffected. Read our dispatch & fulfilment update

Winter is coming — your air conditioner heats too. Cut heating bills by up to 67% vs electric heaters.

🇬🇧 Delivering air conditioning across the UK — free UK mainland delivery on in-stock units
Stockool
Viessmann Vitoclima 300-S Kombi 6.1kW Triple-Zone Multi Split Outdoor Unit
Viessmann

Viessmann Vitoclima 300-S Kombi 6.1kW Triple-Zone Multi Split Outdoor Unit

In StockEnergy A++

Available to order — dispatched on the lead time shown below.

£1,328.36£1,600.00Save £271.64

Trade pricing available — apply or sign in for your trade rate

Dispatched in 2-3 working days
UK-Wide Delivery
Free UK mainland delivery on in-stock units
🇪🇺 EU Delivery available
Dispatched in 3–7 working days, then 5–10 working days EU transit
Orders under €150 ship VAT-paid at checkout (IOSS, no charges on delivery). Orders of €150 or more ship DDU — import VAT and customs duty are collected by the courier on delivery.

Retail prices include VAT.

The Viessmann Vitoclima 300-S Kombi 6.1kW multi split outdoor unit is an outstanding whole-floor cooling and heating solution for residential homes and boutique commercial properties. Offering three dedicated refrigerant circuits, it connects up to three separate indoor units, allowing customized comfort settings in each occupied space. The unit uses environmentally friendly R32 refrigerant with an exceptional seasonal coefficient of performance (SCOP), achieving impressive A++ cooling efficiency. Engineered with a low-vibration twin-rotary inverter compressor, this outdoor chassis minimizes external acoustic emissions, ensuring compliance with UK residential planning regulations. When paired with smart indoor split heads, the entire system connects seamlessly via Wi-Fi for remote temperature scheduling and effortless voice integration.

1

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.

Amazon AlexaGoogle Home
  • Free UK mainland delivery on in-stock units
  • Manufacturer warranty included
  • 14-day returns

Cooling Capacity

21,000 BTU

Energy Rating

A++

Recommended Room

Up to 70m² total across 3 rooms

Technical documents & videos

More from Viessmann →

Official Viessmann manual

The manufacturer's PDF for this model is being sourced and will be downloadable here.

All Viessmann catalogues and rangesMissing a document? Ask our team and we will send it over.

Full Specifications

Cooling Capacity21,000 BTU
Recommended Room SizeUp to 70m² total across 3 rooms
Energy RatingA++
Smart HomeAmazon Alexa, Google Home
Noise Level—
CategoryMulti-Split System AC
SKUVIE-300S-OUT61-3P

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

The Viessmann Vitoclima 300-S Kombi 6.1kW multi split outdoor unit is an outstanding whole-floor cooling and heating solution for residential homes and boutique commercial properties. Offering three dedicated refrigerant circuits, it connects up to three separate indoor units, allowing customized comfort settings in each occupied space. The unit uses environmentally friendly R32 refrigerant with an exceptional seasonal coefficient of performance (SCOP), achieving impressive A++ cooling efficiency. Engineered with a low-vibration twin-rotary inverter compressor, this outdoor chassis minimizes external acoustic emissions, ensuring compliance with UK residential planning regulations. When paired with smart indoor split heads, the entire system connects seamlessly via Wi-Fi for remote temperature scheduling and effortless voice integration.

Compare similar units

Side-by-side specs for other multi-split system ac in a similar BTU range.

This Unit
Viessmann Vitoclima 300-S Kombi 6.1kW Triple-Zone Multi Split Outdoor Unit

Viessmann

Viessmann Vitoclima 300-S Kombi 6.1kW Triple-Zone Multi Split Outdoor Unit

Akai Mistral Smart Multi-Split 9000 + 12000 BTU Wall Mounted Air Conditioner with Heat Pump

Akai

Akai Mistral Smart Multi-Split 9000 + 12000 BTU Wall Mounted Air Conditioner with Heat Pump

Midea Comfee A++ Smart Multi-Split 9000 + 12000 BTU Wall Mounted Air Conditioner with Heat Pump

Midea

Midea Comfee A++ Smart Multi-Split 9000 + 12000 BTU Wall Mounted Air Conditioner with Heat Pump

LG MU3R21.U24A0 6.2kW Triple-Port Multi-Split Outdoor Unit

LG

LG MU3R21.U24A0 6.2kW Triple-Port Multi-Split Outdoor Unit

Cooling Capacity
21,000 BTU
21,000 BTU
21,000 BTU
21,000 BTU
Room Size
Up to 70m² total across 3 rooms
—
—
Up to 75m² total
Energy Rating
A++
—
A++
A++
Heating Capable
Yes (heat pump)
Yes (heat pump)
Yes (heat pump)
Yes (heat pump)
Smart Home
Amazon Alexa, Google Home
Yes
Yes
Google Home, Amazon Alexa
Stock
In Stock
In Stock
In Stock
In Stock
Price inc VAT
£1,328.36
£878.90
£933.90
£1,461.18

Common questions about the Viessmann Vitoclima 300-S Kombi 6.1kW Triple-Zone Multi Split Outdoor Unit

How many BTU is the Viessmann Vitoclima 300-S Kombi 6.1kW Triple-Zone Multi Split Outdoor Unit?

The Viessmann Vitoclima 300-S Kombi 6.1kW Triple-Zone Multi Split Outdoor Unit has a cooling capacity of 21,000 BTU, suitable for Up to 70m² total across 3 rooms.

What room size is the Viessmann Vitoclima 300-S Kombi 6.1kW Triple-Zone Multi Split Outdoor Unit suitable for?

The Viessmann Vitoclima 300-S Kombi 6.1kW Triple-Zone Multi Split Outdoor Unit is recommended for rooms Up to 70m² total across 3 rooms.

Can I install the Viessmann Vitoclima 300-S Kombi 6.1kW Triple-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 6.1kW Triple-Zone Multi Split Outdoor Unit smart-home compatible?

Yes — the Viessmann Vitoclima 300-S Kombi 6.1kW Triple-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 6.1kW Triple-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.

Filter by brand

BelacoBelacoStiebel EltronStiebel EltronBroughtonBroughtonReznorReznorCIATCIATPowrmaticPowrmaticFlaktGroupFlaktGroupSwegonSwegonSuntecSuntecCostwayCostwayVYtronIXVYtronIXBeldrayBeldrayClarkeClarkeOmega AltalfaOmega AltalfaDanthermDanthermAmcorAmcorRhossRhossKelvinatorKelvinatorWestinghouseWestinghouseYorkYorkTraneTraneLennoxLennoxBlack + DeckerBlack + DeckerHoneywellHoneywellSenvilleSenvilleAUXAUXComfeeComfeeWhynterWhynterViessmannViessmannRinnaiRinnaiAermecAermecNIBENIBESinclairSinclairBlyssBlyssFralFralWhirlpoolWhirlpoolElectroluxElectroluxSharpSharpCooper & HunterCooper & HunterDaitsuDaitsuDimplexDimplexBoschBoschVaillantVaillantOlimpia SplendidOlimpia SplendidCarrierCarrierToshibaToshibaMitsubishi Heavy IndustriesMitsubishi Heavy IndustriesDeLonghiDeLonghiHitachiHitachiPro BreezePro BreezeMeacoMeacoAEGAEGDevolaDevolaFujitsuFujitsuelectriQelectriQSamsungSamsungWoodsWoodsMideaMideaHaierHaierTCLTCLHisenseHisenseLGLGGreeGreeEcoAirEcoAirPanasonicPanasonicSealeySealeyDaikinDaikinMitsubishi ElectricMitsubishi Electric

Annual energy savings estimate

How much this A++-rated unit could save versus a standard C-rated model, based on your usage.

This unit

170 kWh/yr

EER 13

Standard model

277 kWh/yr

EER 8

Est. saving

£28.76

107 kWh/yr less

Estimate based on the unit's energy-rating efficiency factor and cooling capacity (21,000 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 7 kW heat output used 5 hrs/day over a 150-day UK heating season at £0.27/kWh.

Electric heater / season

£1335

This AC / season

£445

You save / season

£890

~67% less electricity

Heating methodElectricity / seasonCost / seasonEfficiencySummer cooling
This heat-pump AC1649 kWh£445Up to 300%
Plug-in electric heater4946 kWh£1335100%
Electric storage heater4946 kWh£1335100%

Heat output estimated from this unit's 22,500 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 £445/season to heat a room vs £1335 for an electric heater - that's £890 saved. https://stockool.store/products/viessmann-vitoclima-300-s-kombi-6-1kw-triple-zone-multi-split-outdoor-unit

X Post on X WhatsApp

You may also need

Sealey Air Cooler, Purifier & Humidifier with Remote Control 13L SAC13
In Stock
Sealey

Sealey Air Cooler, Purifier & Humidifier with Remote Control 13L SAC13

Drop-ship available
£151.73inc VAT
Dispatched in 1–2 working days
Sealey Air Cooler, Purifier & Humidifier SAC04
In Stock
Sealey

Sealey Air Cooler, Purifier & Humidifier SAC04

Drop-ship available
£92.33inc VAT
Dispatched in 1–2 working days
Sealey Air Cooler, Heater, Purifier & Humidifier SAC41
In Stock
Sealey Heats too

Sealey Air Cooler, Heater, Purifier & Humidifier SAC41

Heats too (heat pump)
Drop-ship available
£237.53inc VAT
Dispatched in 1–2 working days
Sealey Commercial Portable Air Cooler SAC125
In Stock
Sealey

Sealey Commercial Portable Air Cooler SAC125

Drop-ship available
£989.93inc VAT
Dispatched in 1–2 working days

We use cookies to measure how the store is used and to improve it. You can accept all cookies or keep only the essential ones needed to run your cart and checkout. See our privacy policy.