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Sinclair Keyon SIH-18BIK 4.6kW Inverter Wall Mounted Split System

In StockEnergy A++

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

£880.600

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

2-4 business 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.

Engineered for open-plan living areas, commercial retail floors, and expansive master suites, the Sinclair Keyon SIH-18BIK wall split air conditioner delivers 4.6kW (16,000 BTU) of dependable cooling. Operating on an advanced DC inverter compressor, it minimises electrical load fluctuations to achieve notable running cost reductions with an A++ energy classification. In addition to potent chilling performance, the reverse-cycle heat pump outputs 5.2kW of clean warmth, providing year-round thermal balance across UK seasonal variations. Integrated Wi-Fi ensures total remote control through dedicated mobile apps, easily coordinating with popular digital assistants for voice activation. The unit includes an intuitive I Feel remote sensor, ensuring that room conditions are measured where occupants sit rather than up on the wall. Its durable outdoor casing incorporates anti-corrosion condenser fins, delivering extended operational life even in damp British climates.

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.

Smart guide

Amazon AlexaGoogle Assistant

Free UK mainland delivery on in-stock units
Manufacturer warranty included
14-day returns

Cooling Capacity

16,000 BTU

Energy Rating

A++

Recommended Room

35-50 m²

Technical documents & videos

Official Sinclair manual

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

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

Full Specifications

Cooling Capacity16,000 BTU

Recommended Room Size35-50 m²

Energy RatingA++

Smart HomeAmazon Alexa, Google Assistant

Noise Level—

CategorySplit System AC

SKUSIN-SIH18BIK-SET

Physical dimensions

Exact dimensions for this model are being confirmed with Sinclair — ask us and we will send the cut sheet with mounting and clearance figures.

Description

Compare similar units

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

This Unit

Sinclair

Sinclair Keyon SIH-18BIK 4.6kW Inverter Wall Mounted Split System

Toshiba

Toshiba RAS16 16000 BTU A++ Wall Mounted Split Air Conditioner with Heat Pump

Toshiba

Toshiba SHORAI Edge 4.6kW Wall Split System

Toshiba

Toshiba HAORI 4.6kW Designer Wall Split System

Cooling Capacity

16,000 BTU

15,700 BTU

Room Size

35-50 m²

—

Up to 45m²

Energy Rating

A++

A+++

Heating Capable

Yes (heat pump)

Smart Home

Amazon Alexa, Google Assistant

Not built-in

Google Home, Amazon Alexa

Stock

In Stock

Price inc VAT

£880.60

£879.97

£1,417.91

£1,716.42

Common questions about the Sinclair Keyon SIH-18BIK 4.6kW Inverter Wall Mounted Split System

How many BTU is the Sinclair Keyon SIH-18BIK 4.6kW Inverter Wall Mounted Split System?

The Sinclair Keyon SIH-18BIK 4.6kW Inverter Wall Mounted Split System has a cooling capacity of 16,000 BTU, suitable for 35-50 m².

What room size is the Sinclair Keyon SIH-18BIK 4.6kW Inverter Wall Mounted Split System suitable for?

The Sinclair Keyon SIH-18BIK 4.6kW Inverter Wall Mounted Split System is recommended for rooms 35-50 m².

Can I install the Sinclair Keyon SIH-18BIK 4.6kW Inverter Wall Mounted 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 Sinclair Keyon SIH-18BIK 4.6kW Inverter Wall Mounted Split System smart-home compatible?

Yes — the Sinclair Keyon SIH-18BIK 4.6kW Inverter Wall Mounted Split System supports Amazon Alexa, Google Assistant for app and voice control.

How long does delivery of the Sinclair Keyon SIH-18BIK 4.6kW Inverter Wall Mounted Split System take?

This unit is 2-4 business days. Delivery is then 1–2 working days to most UK mainland addresses, and 3–6 working days into the EU.

Annual energy savings estimate

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

Electricity tariff (£/kWh)Hours per dayCooling months/year

This unit

130 kWh/yr

EER 13

Standard model

211 kWh/yr

EER 8

Est. saving

£21.91

81 kWh/yr less

Estimate based on the unit's energy-rating efficiency factor and cooling capacity (16,000 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 5 kW heat output used 5 hrs/day over a 150-day UK heating season at £0.27/kWh.

Electric heater / season

£1050

This AC / season

£350

You save / season

£700

~67% less electricity

Heating method	Electricity / season	Cost / season	Efficiency
This heat-pump AC	1297 kWh	£350	Up to 300%
Plug-in electric heater	3891 kWh	£1050	100%
Electric storage heater	3891 kWh	£1050	100%

Heat output estimated from this unit's 17,700 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 £350/season to heat a room vs £1050 for an electric heater - that's £700 saved. https://stockool.store/products/sinclair-keyon-sih-18bik-4-6kw-split-system

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