Onyx - Portable 1000W Ceramic Desk Heater | PTC, Touch Control, Timer

Onyx – Fast, Quiet Warmth Where You Need It

The Onyx is a compact PTC ceramic heater that sits neatly on a desk, a bedside table or the floor beside your chair. It heats a room of up to around 20 m² in seconds, and with three heat settings, a touch screen and an auto-off timer it is an easy way to keep one room comfortable without turning the central heating on.

Key Features

• PTC ceramic heating – reaches working temperature in about 3 seconds and holds a steady, even heat
• Three heat settings – 500W, 800W and 1000W, so you only use the power you need (from about 13p an hour – see running costs below)
• Heats up to around 20 m² – wide 360° airflow spreads warmth around the room instead of aiming it at one spot
• ECO mode with NTC sensor – senses the room temperature and cycles the heater to hold it, rather than running flat out
• Touch screen with digital display – shows the heat level (P1/P2/P3) and the timer setting at a glance
• Four timer settings – switches itself off after 1, 2, 4 or 8 hours, and after 12 hours if no timer is set
• Quiet at 36 dB – quiet enough for a bedroom, nursery or shared office
• 7 safety protections – 45° tip-over cut-off, overheat protection, thermal fuse, fan-jam protection, bounce temperature control, anti-debris air inlet and a fire-retardant ABS/PC and PA66 housing
• Light and portable – 845 g with a 1.5 m certified power cord, so it moves from desk to bedside in seconds

What It Costs To Run

Heating one room instead of the whole house is where a heater like this saves you money. These are guide figures based on the Ofgem price cap electricity unit rate of 26.32p per kWh (1 October to 31 December 2026) — your own tariff may differ.

• P1 – 500W: about 13p per hour
• P2 – 800W: about 21p per hour
• P3 – 1000W: about 26p per hour

In ECO mode the heater cycles on and off to hold the temperature you have set, so over a few hours it will usually cost less than the figures above.

Where It Works Best

• Home office – quiet enough to sit on the desk while you work
• Bedroom – set the timer and it switches itself off overnight
• Study or student room – small footprint on a desk or shelf
• Living room – stand it on the floor beside the sofa for spot warmth

Specifications

• Rated power: 1000W maximum – 500W / 800W / 1000W settings
• Heating technology: PTC ceramic heating element
• Voltage: 220-240V UK mains, standard 3-pin plug
• Current draw: 4-5.5A
• Heat-up time: approximately 3 seconds
• Coverage: rooms up to approximately 20 m²
• Control type: touch screen panel with digital display (P1-P2-P3 / 1h-2h-4h-8h)
• Timer: 1 / 2 / 4 / 8 hours, or 12 hours by default
• Fan speed: 4000 RPM (±10%)
• Noise level: 36 dB
• Housing: fire-retardant ABS/PC and PA66
• Safety: 45° tip-over cut-off, overheat protection, thermal fuse, fan-jam protection, anti-debris air inlet, flame-retardant housing
• Cable length: 150 cm, certified power cord
• Colour: Black
• Net weight: 845 g
• Use: indoor use only

Safety Notes

• Plug directly into a wall socket – do not use an extension lead or multi-way adaptor
• Keep at least 1 metre clear of curtains, bedding, furniture and anything flammable
• Never cover the heater or block the air inlet or outlet
• Do not leave running unattended around young children or pets
• Not for use in bathrooms, wet rooms or outdoors
• The fan runs a 15-second cool-down countdown after you switch the heater off – this is normal

Small enough for the desk, warm enough for the room — a simple way to take the chill off this winter.