The verdict, in one paragraph
Heat the person, not the room. A USB heated garment runs on a published 5V 2A supply — 10 watts. A portable electric space heater is published at up to 1,500 watts. From the same 2,073.6Wh battery, the heater lasts barely over an hour and the garment lasts for days, which is why heated clothing is a real outage plan and a battery-powered room heater is not one. Buy a heated vest for the core, heated socks for the part that actually drives people out of a cold house, a 5V 2A spare pack so the gear outlasts the first evening, and air-activated warmers as the backstop for when every battery is flat. If an actual room has to be kept above freezing, that is a propane job, not an electrical one.
The arithmetic, in one table
| What you are heating | Published load | Hours from 2,073.6 Wh | Realistic? |
|---|
| A person, USB heated garment | 10 W (5 V at 2 A) | About 200 h | Yes, trivially |
|---|
| A person, heated socks on their own packs | Not published in watts | Up to 8 h per charge, per the listing | Yes |
|---|
| A room, electric space heater on low | 750 W | About 2.8 h | Barely |
|---|
| A room, electric space heater on high | 1,500 W | About 1.4 h | No |
|---|
Loads are published figures: 5V 2A from the power bank listing, and 750-1,500 W with a 6.5-12.5 A current draw from Lasko's published specification for a 1,500W ceramic tower. The hours column is our arithmetic against BLUETTI's published 2,073.6Wh capacity, before inverter losses, and is not a manufacturer claim. Live prices sit inside the buy buttons above with the date each was refreshed.
How these were chosen
This site runs no test bench and no thermal chamber. Every figure here is a published manufacturer or listing specification, cited at the foot of the page, and every product was checked as currently in stock before it was written up. Two rules applied:
- It had to work when the house is cold, not when it is warm. Comfort gear for a heated room is a different category and is not what this page is for.
- Nothing here claims to replace heating. Where a product cannot keep a room above freezing, the page says so rather than implying otherwise.
Why heated clothing works and a battery room heater does not
A space heater has to raise the temperature of every cubic foot of air in a room, and then keep replacing the heat that leaks through the walls and windows. A heated garment has to raise the temperature of a few square feet of fabric held against a body that is already producing heat. One of those jobs is a hundred and fifty times larger than the other, and the published figures say so plainly.
This is the same arithmetic that governs every heating question on this site: electric heat is resistance heat, and resistance heat is measured in kilowatts. Backup power for a space heater works the room-heating case through in full, and a home with electric heat is the hardest version of it.
What a household actually needs
- One heated layer per adult. Two people sharing one vest is one person being cold.
- Socks before gloves. Hands stay busy; feet do not. The complaint that ends an evening is almost always feet.
- One spare 5V pack per garment. A garment is only as long-lived as its battery, and chargers need power you may not have.
- Disposable warmers for everyone else. Children, guests and anyone who refuses to wear the gear. Ten pairs is one long night for a family.
- A lantern that is also a power bank. The Goal Zero Lighthouse 600 publishes a 5,200mAh battery with USB output, so the light is also a garment charge — the lantern roundup compares the field.
The safety part, which is short but not optional
- Do not sleep in heated clothing. Heated garments are designed to be worn by someone awake who can feel them. The auto-off timers exist for a reason.
- Do not use heated gear on someone who cannot feel heat. Reduced sensation in the feet, which is common with diabetes and with age, turns a heat setting into a burn risk.
- Do not run a combustion heater unattended. The propane pick above has an oxygen depletion sensor and still needs ventilation, a CO alarm and a conscious adult — the CO detector roundup is the companion purchase.
Where this fits in a winter plan
Heated gear is the cheapest layer of a cold-weather outage plan and the one most households skip, because a battery feels like the serious purchase. In practice the order that works is: keep the furnace running if you possibly can, keep the pipes from freezing, and keep the people comfortable so nobody has to leave.
The first of those is a watts problem — backup power for a furnace. The second has a deadline — keeping pipes from freezing. This page is the third, and it is the one that costs the least.
The short version
Ten watts on a person beats fifteen hundred watts on a room, every time, from any battery. Buy a heated vest, heated socks and a spare 5V 2A pack, keep air-activated warmers as the backstop, and reserve combustion heat for a room that genuinely has to stay above freezing — with ventilation and a CO alarm.
