What size room can the KELVIN heat?

Joyus rates it for up to about 10 m² (107 sq ft), assuming a 2.4 m ceiling and good (A+ class) insulation. Treat that as a single small room, not an open-plan space.

Does it need a thermostat or hub?

No. A wireless temperature sensor and the mobile app are included, and the heater uses them to hold a set temperature on its own.

It mounts on the wall with the included bracket and plugs into a standard outlet. Because it is heavy, mounting into studs or solid wall material is the safer route.

Yes. It is an electric infrared panel with no fan or compressor, so it makes no operating noise.

Can it replace central heating for a whole home?

No. Its rated coverage is a single small room, so it works best as spot heating for a basement, bathroom or office alongside other heat.

Where is the Joyus KELVIN Smart Heater cheapest?

At eBay, for $179.20, as of our latest check.

What do buyers say about the Joyus KELVIN Smart Heater?

Buyers like: Works well in a basement living area; Very effective space heater that does the job; Quiet and surprisingly inconspicuous. Common complaints: Stopped working after one year of use; Heavy; drywall anchors not trusted to hold the weight.

Where can I buy the Joyus KELVIN Smart Heater?

2 stores we checked sell it, including eBay, BOLDR.

Joyus KELVIN Smart Heater Price History: Lowest $179.20 at eBay

What reviewers say

Owners of small spaces, including basements and bathrooms, say the KELVIN heats effectively and runs quietly enough to forget it is there. The main complaints are durability, with at least one unit failing after a year, and mounting, since the heater is heavy and the supplied anchors are doubted for drywall.

What people mention

Heating performancePraisedOwners say it warms a basement room and a cold bathroom effectively for its size.
NoisePraisedReviewers describe it as completely silent and easy to overlook once mounted.
DurabilityCriticisedAt least one owner reports the heater stopped working after a year of use.
MountingCriticisedOwners find it heavy and distrust the included drywall anchors, wanting a stud-mounted option.
Smart controlPraisedThe app and wireless sensor are credited with automating room temperature without manual adjustment.

From BOLDR

Energy saving and intelligent infrared heater controllable from anywhere
Sets up in minutes by plugging into a standard outlet
Runs completely silent
Smart functions automate your home climate
Comes included with a wireless temperature sensor and mobile app
Heats up to 10 m² (107 sqft), based on 2.4 m ceiling height and A+ insulation class

Sizes: Standard, Large, Starter Kit
Shipping: 48H express shipping; shipping calculated at checkout
Packs: Standard, Large and Starter Kit options
In the box: Wireless temperature sensor, Wall-mount, Mobile app

About the Joyus KELVIN Smart Heater

The Joyus KELVIN Smart Heater is an electric infrared heater that can be controlled from anywhere with a mobile app. It plugs into a standard outlet and sets up in minutes. It runs completely silent.

Smart functions automate the home climate. A wireless temperature sensor and the mobile app come with the heater.

It heats a space of up to 10 m² (107 sqft), based on a 2.4 m ceiling height and A+ insulation class.

Heat source: Electric
Type: Infrared heater
Finish: White
Heating area: Up to 10 m² (107 sqft), based on 2.4 m ceiling height and A+ insulation class
Power: Plugs into a standard outlet
Control: Mobile app, from anywhere
Noise: Completely silent
In the box: Wireless temperature sensor, wall-mount, mobile app

What buyers say

Buyers like

Works well in a basement living area
Very effective space heater that does the job
Quiet and surprisingly inconspicuous
Turned a cold bathroom into a welcoming space
Helpful customer support with prompt call-backs and knowledgeable, pleasant tech supporters

Buyers complain about