The US Portable Space Heater Buying Guide

1. Decide what job the heater is doing

A space heater is a supplement. It is there to make one room comfortable while your central heating handles the baseline. If you are trying to heat an entire house with plug-in units, you will be disappointed and your electric bill will not thank you.

2. Pick the right heating type

• Ceramic (PTC): fast, compact, usually the best all-rounder for bedrooms and offices. Warm air within a minute or two.
• Oil-filled radiator: silent and steady, but slow and heavy. Good for a room you occupy all evening.
• Infrared: heats objects and people directly rather than the air. Good for drafty spaces like garages, less good for holding a room temperature.
• Basic fan heater: cheap and fast, usually loud, rarely has a thermostat or timer.

3. Size it to the room, honestly

A rough industry rule is about 10 watts per square foot for a reasonably insulated room. A 150 sq ft bedroom therefore wants around 1,500 watts. Compact personal heaters like RapidHeat are designed for spaces up to roughly 130 square feet each — which is why people with an open-plan living area typically run two units rather than expecting one to do everything.

4. Insist on these safety features

• Automatic overheat shut-off
• Tip-over or tip-safe protection
• Cool-touch housing and flame-retardant materials
• A programmable timer so it does not run all night unattended

Then use it properly: plug it directly into a wall outlet, never into an extension cord or power strip, and keep three feet of clearance from bedding, curtains and furniture.

5. Understand the running cost

A heater's running cost is simply its wattage multiplied by hours used multiplied by your electricity rate. A 1,500W heater run for 4 hours uses 6 kWh. At $0.17 per kWh that's about $1.02. The savings never come from the heater being magic — they come from not heating six other rooms at the same time. Run the numbers for your own home on the running cost calculator.

6. Common mistakes

• Buying one small heater and expecting whole-house performance.
• Using an extension cord — a genuine fire risk with any heater.
• Running it 24/7 instead of using the timer and thermostat.
• Placing it in a corner behind furniture where air cannot circulate.
• Ignoring the draft under the door that is undoing all the work.

Where RapidHeat fits

RapidHeat is a compact ceramic heater with a thermostat, timer, remote and the safety cut-offs listed above, designed for the single-room job described at the top of this page. If that's what you need, see the current bundles. If you need to heat a cold, uninsulated garage all winter, buy something bigger — we'd rather tell you that now.