Rointe Onyx 1000W Wi-Fi High Heat Retention Storage Heater | SHOXI222

Smart 1000W HHR Storage Heater with 2220W Input, Wi-Fi Direct & Rointe NEXA App Control

The Rointe Onyx SHOXI222 is a smart High Heat Retention storage heater designed to provide efficient, controllable electric heating with intelligent charging, Wi-Fi connectivity and advanced energy-management functions.

This model delivers a 1000W rated heat output from a 2220W charging input and uses 8 energy-cell packs with a maximum storage capacity of 15,540Wh. Rointe lists the SHOXI222 as the 1000W model within its Onyx Wi-Fi and AI-enabled storage-heater range.

Built-in Wi-Fi Direct allows the heater to connect to a compatible 2.4GHz router without an additional gateway, while the Rointe NEXA app provides connected control and energy-management functionality.

Features

• 1000W High Heat Retention Storage Heater
• 2220W Rated Charging Input
• 15,540Wh Maximum Storage Capacity
• 8 Energy Cell Packs
• High Heat Retention Mg-Fe Alloy Cells
• Smart Automatic Charge Control
• Built-In Wi-Fi Direct
• No Separate Wi-Fi Gateway Required
• 2.4GHz Wi-Fi Compatible
• Bluetooth Pairing
• Rointe NEXA App Control
• AI Heating Technology
• Inverter Smart Adaptive Technology
• True Real Power Consumption Meter
• 24/7 Programmable Heating
• 4 Pre-Installed Programmes
• Open Window Detection
• Early Start
• Limited Mode
• Night Saving Mode
• Holiday Mode
• Countdown Timer
• Boost Mode
• Product & App Lock
• Voice Assistant Compatibility
• Full-Colour Touch Control Display
• High Heat Retention / SAP-Oriented Design
• White RAL 9016 Finish
• 10-Year Body Guarantee
• 3-Year Electronics Guarantee

Rointe's current 2025 technical catalogue confirms these core technologies across the Onyx range, including Wi-Fi, Bluetooth, automatic charge control, AI, open-window detection, Early Start, consumption metering and connected programming.

High Heat Retention Storage Technology

The SHOXI222 uses a high-density mineral storage core with Mg-Fe alloy cells to retain thermal energy and release it when required.

Rointe lists a maximum storage capacity of 15,540Wh for the SHOXI222, significantly increasing stored-energy capacity compared with the smaller SHOXI102 and SHOXI156 models.

Rointe also describes the Onyx as a next-generation HHR heater capable of retaining over 55% of stored heat, with up to 16 hours of retained heat highlighted in its current product information.

Smart Automatic Charge Control

The Onyx does not simply charge its core indiscriminately. Its automatic charge-control system is designed to calculate how much stored energy is required based on heating demand.

This helps prevent excessive charging while ensuring sufficient stored heat remains available for the programmed heating period. Rointe lists automatic charge control as a core Onyx feature.

Wi-Fi Direct – No Gateway Required

An integrated Wi-Fi Direct module allows the SHOXI222 to connect straight to a compatible home router.

This avoids the need to purchase and install a separate gateway, simplifying connected-heating installation and helping reduce additional hardware costs. Rointe specifies compatibility with 2.4GHz Wi-Fi networks.

Rointe NEXA App Control

Once connected, the heater can be managed using the Rointe NEXA app.

The connected platform allows users to manage heating programmes and smart functions remotely, while Rointe also promotes remote monitoring as a core benefit of the Onyx platform.

AI Heating System

Rointe's Onyx range includes an Artificial Intelligence heating layer designed to improve heating control and energy management.

Combined with connected app functionality, the system is intended to analyse operating behaviour and help optimise comfort and consumption. AI is specifically listed as a key Onyx control feature in Rointe's current technical catalogue.

Inverter Smart Adaptive Technology

The Onyx incorporates Inverter Smart Adaptive Technology, Rointe's advanced heating-control system designed to adjust power progressively according to actual comfort requirements.

Rointe states that this technology can reduce stabilisation power by up to 80% compared with traditional systems, helping improve temperature stability and reduce unnecessary energy use.

True Real Power Consumption Monitoring

The SHOXI222 incorporates a TRP / True Real Power consumption meter.

This provides consumption information through the connected system, giving users greater visibility over how much energy the heater is using and helping support more informed programming and temperature decisions.

24/7 Smart Programming

The Onyx supports comprehensive programmable operation, including:

• 24/7 Programming
• 4 Pre-Installed Programmes
• Boost Mode
• Countdown Timer
• Holiday Mode
• Night Saving Mode
• Product & App Lock
• Limited Mode

These functions allow the heater to be adapted around occupancy patterns rather than simply operating continuously at one fixed setting.

Open Window Detection

The Open Windows function is designed to detect conditions consistent with a sudden drop in room temperature and adjust heater operation accordingly.

This helps reduce unnecessary energy use when heat is escaping through an open window or door. Rointe lists Open Windows as one of the Onyx's standard energy-saving functions.

Early Start

The Early Start function allows the heater to anticipate a programmed heating period and begin heating early enough to achieve the desired comfort level at the scheduled time.

This reduces the need for users to manually estimate long pre-heating periods.

Limited Mode

Limited Mode restricts available settings and can help prevent unauthorised or excessive temperature adjustments.

This makes it particularly useful in:

• Rental Properties
• Holiday Lets
• Hotels
• Student Accommodation
• Homes with Children
• Managed Housing

Rointe specifically lists a Limited mode for guests within the Onyx functionality.

Night Saving & Holiday Modes

Night Saving Mode provides an additional means of reducing unnecessary heating during sleeping hours, while Holiday Mode enables operation to be reduced during extended absences.

These modes complement the core weekly programming and smart charging functions, helping tailor the heater around actual occupancy.

Voice Assistant Compatibility

The Onyx range is designed to be compatible with voice assistants, providing an additional smart-control option alongside the onboard control panel and Rointe NEXA app.

Touch Panel & Display

The heater incorporates an onboard touch panel with display, providing direct access to temperature, programming and operating controls without needing to use a smartphone for everyday adjustments.

The heater weighs approximately 30kg without the energy cells and 115kg with the cells installed.

Rointe also supplies adjustable floor supports in standard and taller configurations as part of the Onyx installation system.

• Brand: Rointe
• Range: Onyx
• Model / Product Code: SHOXI222
• Product Type: Wi-Fi High Heat Retention Storage Heater
• Rated Heat Output: 1000W
• Rated Charging Input: 2220W
• Classification Rating: 740W
• Maximum Storage Capacity: 15,540Wh
• Required Energy Cell Packs: 8
• Energy Cells per Pack: 3
• Storage Core: High Heat Retention Mg-Fe Alloy Cells
• Automatic Charge Control: Yes
• Wi-Fi: Integrated Wi-Fi Direct
• Wi-Fi Frequency: 2.4GHz
• Gateway Required: No
• Bluetooth: Yes
• App Control: Rointe NEXA
• AI Heating: Yes
• Inverter Smart Adaptive Technology: Yes
• Consumption Meter: TRP / True Real Power
• Voice Assistant Compatible: Yes
• Programming: 24/7
• Pre-Installed Programmes: 4
• Open Window Detection: Yes
• Early Start: Yes
• Limited Mode: Yes
• Night Saving Mode: Yes
• Holiday Mode: Yes
• Boost Mode: Yes
• Countdown Timer: Yes
• Product & App Lock: Yes
• Control: Touch Panel with Display
• Colour: White
• Finish: RAL 9016
• Height: 740mm
• Width: 865mm
• Depth: 190mm
• Empty Weight: 30kg
• Installed Weight with Cells: 115kg
• Body Material: 100% Metal Body
• Fan: Ceramic Fan Rotor
• Electronic Components Guarantee: 3 Years
• Product Body Guarantee: 10 Years

Suitable Applications

• Domestic High Heat Retention Heating
• Living Rooms
• Bedrooms
• Dining Areas
• Home Offices
• Apartments & Flats
• Electric-Only Homes
• New-Build Properties
• Storage Heater Replacement Projects
• Energy-Efficient Heating Upgrades
• Smart Home Heating Systems
• Rental Properties
• Holiday Accommodation
• Social & Managed Housing
• Properties Using Suitable Off-Peak Electricity Tariffs
• Connected Rointe Heating Installations

Correct heater sizing should always be based on the calculated heat loss of the room rather than wattage or floor area alone.

Why Choose the Rointe Onyx SHOXI222?

The Rointe Onyx SHOXI222 is an excellent option where greater storage and heating capacity is required without moving to the largest models in the Onyx range.

Its combination of 2220W charging input, 1000W output, 15.54kWh maximum storage capacity and eight energy-cell packs provides substantially more stored heat than the smaller SHOXI102 and SHOXI156 units.

At the same time, features including automatic charge control, Wi-Fi Direct, NEXA app connectivity, AI heating, Inverter Smart Adaptive technology, consumption monitoring and 24/7 programming give the SHOXI222 much greater control than a traditional fixed-charge storage heater.

For modern electric-heating installations requiring a 1000W High Heat Retention storage heater with smart charging and remote control, the SHOXI222 offers a strong balance between thermal storage capacity and intelligent energy management.

What are Heavy Goods?

Carriage is shown at the checkout stage and is charged at the cost price of a pallet based on a 48-hour delivery service to most locations; more remote locations can be longer because of the logistics involved. All storage heaters, except mini-bathroom storage heaters, are over the standard carriage weight of 30 kg. Carriage is calculated based on your postcode and the number of pallets that will be necessary to dispatch your order (e.g. the cost of delivering 4 storage heaters could well be the same cost as delivering 1 storage heater if it is possible to get 4 heaters of the size ordered onto one pallet). We work on a maximum weight of 500 kg per pallet, which will be delivered by lorry. It is your responsibility to unload the pallet.