Best Space Heaters Under $20 (2026)

The Amazon Basics heater is a 500 watt ceramic unit, which converts electricity to heat at close to 100 percent efficiency like any resistance heater. At 500 watts it makes about 1,700 BTU per hour, enough to take the chill off one person at a desk but not enough to change the temperature of a room. The element is ceramic, which limits its own temperature, and tip-over protection shuts it off if it is knocked.

Its size is the point. At roughly six inches on each side it fits on a desk, a small table or a bathroom shelf, and it plugs straight into the wall with no remote or display to fail. Compared with the DTZY at 1000 watts it makes half the heat, but it also draws half the current, which is easier on a shared circuit and gentler on a cheap outlet.

Ownership is simple. Keep it at least three feet from anything combustible, plug it directly into a wall outlet and never into a power strip, and unplug it when you leave. Dust the grille every month so airflow is not blocked. If the plug ever feels warm, stop using it. For a person at a desk it is the best low-cost, low-risk choice here.

The DTZY is rated at 1000 watts, double the Amazon Basics, which means about 3,400 BTU per hour of heat. That is enough to take the edge off a small bathroom or a bedroom corner, though it still cannot heat a room that has no other warmth. It uses a PTC ceramic element, which regulates its own temperature, and the listing states UL certification plus overheat and 45 degree tip-over shutoff.

The tradeoff is brand certainty and thermal load. A 1000 watt unit pulls 8.3 amps, so it needs a circuit that is not shared with a kettle or hairdryer, and a cheap cord at that current is a thing to inspect. Its low weight of 1.6 lb and slim 11 inch profile make it easy to place, but a light heater also tips easier, so put it on a flat, hard surface.

Check the plug after the first hour: warm is acceptable, hot is not. Dust the vents monthly and never leave it running while you sleep unattended. If you accept a lesser-known brand for twice the heat of the Amazon Basics, it is the one to buy for a very small room. In a bathroom, remember that a plug-in heater of this kind is not rated for splashes, so keep it well away from the tub and sink and never run it on a wet surface. If the room feels cold the moment you step out of the shower, switch it on ten minutes earlier and let the small space catch up.

ASNUG sells a 500 watt PTC ceramic unit measuring about 6.1 by 5.75 inches and under three inches thick. The listing leans on a silent mode and flame-retardant materials, along with automatic tip-over and overheat shutoff. In practice that makes it a slim personal heater for a desk, a nightstand or a camper bunk.

The heat output is the same 500 watts as the Amazon Basics and Gaiatop, so the differences are shape and noise. Its thin profile is helpful when you want to slide it under a shelf, and the lower fan speed is quieter than a typical mini heater. Compared with the DTZY it is half as strong, but it is also a gentler load on an old outlet.

Treat it like any mini heater. Keep clear space around it, check the plug for warmth and unplug it when you leave. It will not warm a room, but it will take the sting off a cold chair. Because the casing is thin, heat from the element can warm the plastic near the grille, so do not stack it against a wall or stuff it into a shelf cubby. A short rubber pad under the base also keeps it from sliding on a smooth desk when you bump the cord.

Gaiatop advertises a two second warm-up from a 500 watt PTC ceramic element. That is plausible for the air immediately in front of the grille, since a small element heats quickly, but it does not mean a room warms in two seconds. Built-in 45 degree tip-over protection and overheat shutoff are listed.

It is a very similar machine to the ASNUG and the Amazon Basics, with the same heat output and a lightweight shell. The reason to choose it is price and availability rather than any special feature.

Use it close to you and keep it away from fabrics. Dust the grille and check the plug regularly. Do not confuse fast warm-up with strong heat. The ceramic element starts blowing warm air quickly, but the output stays at 500 watts, so the feeling fades a few feet away. For a stuffy home office it is enough to keep your hands and ankles comfortable through a workday.