How to Choose a Space Heater: Ceramic vs Oil-Filled vs Convection

A portable electric heater can make one cold room comfortable without warming the whole house, but the choices on the shelf can be confusing: ceramic fan heaters, oil-filled radiators, fanless convection panels, wall-mounted units and towers. This guide explains how each type works and who it suits, then covers the safety features worth paying for. It draws on Ontario's Save on Energy space heater buying guide, U.S. safety data from the Consumer Product Safety Commission (CPSC) and the National Fire Protection Association (NFPA), and Dreo's heater lineup as listed on dreo.com on October 31, 2026. It is a research-based guide; we have not run these heaters ourselves.

Start with the basics: watts, not "efficiency"

Save on Energy makes a point that cuts through a lot of marketing: every electric space heater converts electricity to heat at essentially 100% efficiency, which is why space heaters are not certified under ENERGY STAR. Two heaters with the same wattage use the same energy for the same running time. What differs is how the heat reaches you.

It also gives a rule of thumb for sizing. Many "whole room" heaters draw about 1,500 watts, which is about as much as a household wall outlet can safely supply, and manufacturers and retailers often suggest around 10 watts per square foot. By that measure a 1,500-watt heater suits roughly a 150 sq ft room, while personal heaters for a desk run at about half that wattage.

A space heater only saves energy if you turn the main heating down and warm just the room you are using. If the furnace keeps running as usual, the heater simply adds to the bill.

The main types

Fan-forced ceramic (convection with a fan)

These heaters warm a ceramic element and use a fan to push warm air into the room. Save on Energy says they heat a room quickly and come in many sizes, and some have a fan-only mode for summer. The downsides: fans can be noisier and can move dust and allergens around, which matters for allergy and asthma sufferers.

In Dreo's lineup, most heaters are this type. Examples include the Ceramic Heater 316 ($39.99), the Heater 320 ($49.99), the Ceramic Heater 319 ($69.99) and the Whole-Room Heater 720 ($119.99). Dreo lists the 314 with an ALCI safety plug ($59.99) as a 1,500 W ceramic heater with 900 W and 1,300 W settings, an ECO mode, tip-over and overheat protection and a 24-hour auto shutoff, and says the ALCI plug cuts power if it detects leakage, which is why Dreo positions it for bathrooms.

Oil-filled radiators

Oil-filled heaters warm sealed oil inside fins, which then heat the room by natural convection and some radiant heat, without a fan. Save on Energy says they are slow to warm up and slow to cool down, which gives steadier warmth and some heat after switching off. They tend to be larger, heavier and less easy to move between rooms. Dreo lists the Oil-filled Radiator 153 and 310 at $99.99 each and the 521 at $129.99, and its listings for the 310 and 521 mention remote controls, 24-hour timers and built-in safety protections such as tip-over and overheat shutoff on the 521.

Fanless convection panels

Fanless convection heaters warm air that rises naturally, so they run silently. Dreo's Convection Heater 711 ($149.99) and 711S ($169.99) are in this group; Dreo lists the 711 at 1,500 W with an IP24 splash-resistance rating, ECO mode and wheels. Save on Energy describes a related type, micathermic panels, as combining convection with radiant heat and suiting long periods of heating.

Radiant or infrared

Radiant heaters warm people and objects directly rather than the surrounding air, much like sitting in sunlight. Save on Energy says they suit someone who stays in one spot, though they can cost more.

Wall-mounted and tower heaters

Wall-mounted units free up floor space, and towers spread heat over a wider area with oscillation. Dreo lists wall-mounted models from $99.90 (517S) to $149.99 (739AS), and towers such as the 718. These are still ceramic heaters inside; the shape mainly changes placement and airflow.

Quick comparison

Features worth paying for

Save on Energy lists the features that make a practical difference:

• Adjustable thermostat, so the heater does not run harder than it needs to
• Multiple heat settings or an ECO mode, so you can use fewer watts
• Timer with auto shutoff, in case you forget to switch it off
• Safety certification from a recognized testing body such as UL or CSA
• Tip-over and overheat shutoff

It also notes that decorative lighting adds nothing to heating performance, so it is not worth paying extra for on its own.

Safety: the numbers behind the rules

Heater fires are concentrated in the coldest months. In a January 2026 safety release, the CPSC said portable heaters were linked to an average of 1,600 fires, 70 deaths and 150 injuries per year from 2020 to 2022. The NFPA, in its own January 2026 release, reported an average of 37,365 home heating fires a year from 2020 to 2024, causing 417 deaths, 1,260 injuries and $1.2 billion in property damage. Space heaters and stoves accounted for 47% of those fires but 73% of the deaths and 70% of the injuries, and 46% of heating fires happened from December to February.

The core rules from the CPSC, the NFPA and Save on Energy line up:

• Keep the heater at least 3 feet from anything that can burn, including bedding, curtains and furniture.
• Plug it directly into a wall outlet. Never use an extension cord or power strip, and do not run the cord under a rug.
• Use only one heat-producing appliance per outlet.
• Turn the heater off when you leave the room or go to sleep.
• Never drape clothes over it, and keep it away from water.
• Check for recalls on any heater you own at cpsc.gov/recalls.

Check recalls before you buy or plug in

Recalls happen even with established brands. On October 29, 2026, the CPSC announced that Dreo recalled about 338,800 DR-HSH015 ceramic space heaters in the U.S., made from April 2025 through January 2026, because they can overheat and ignite. Dreo had received 17 reports of heaters igniting, including three with property damage and one burn injury. The heaters were sold at Costco and online at retailers including Dreo.com, Lowes.com, BestBuy.com and HomeDepot.com for $70 to $110. Owners should stop using them and contact Dreo for a free replacement.

Read our DR-HSH015 recall coverage for how to check your model, and our space heater safety checklist for a room-by-room routine.

Where to buy

Buy from a retailer with a clear return window. At Lowe's, for example, most new, unused items can be returned within 90 days, but products listed as "construction heat" have a 48-hour window, so check the category before ordering a larger jobsite-style heater. Dreo sells its heaters directly as well.

See Dreo's current heater range

Editorial disclosure

SurfGirl may earn a commission if you buy through links on this page. It does not affect which products we cover. This guide is based on public safety data, an energy agency's buying guide and manufacturer listings; we did not use these heaters ourselves. See how we research for details.

References

1. Buying Guide: Space heaters for your home. Save on Energy (Independent Electricity System Operator, Ontario). https://saveonenergy.ca/en/For-Your-Home/Advice-and-Tips/Space-heater-buying-guide
2. Keep Warm and Safe This Winter: Tips for Using Generators, Furnaces and Space Heaters. U.S. Consumer Product Safety Commission. https://www.cpsc.gov/Newsroom/News-Releases/2026/Keep-Warm-and-Safe-This-Winter-Tips-for-Using-Generators-Furnaces-and-Space-Heaters
3. U.S. home heating fires peak during winter months. National Fire Protection Association. https://www.nfpa.org/about-nfpa/press-room/news-releases/2026/us-home-heating-fires-peak-during-winter-months
4. DREO Recalls DR-HSH015 Space Heaters Due to Fire and Burn Hazards. U.S. Consumer Product Safety Commission. https://www.cpsc.gov/Recalls/2027/DREO-Recalls-DR-HSH015-Space-Heaters-Due-to-Fire-and-Burn-Hazards
5. Space heaters collection and product listings. Dreo. https://www.dreo.com/collections/dreo-space-heaters
6. Returns Policy. Lowe's. https://www.lowes.com/l/help/returns-policy