The world runs on two standards
Roughly speaking, the Americas and Japan run at 100–127 V, and most of Europe, Africa, Asia and Oceania run at 220–240 V. A heater is built for one or the other.
Plug a 110 V heater into a 230 V supply and you feed it roughly double the voltage it was designed for. That is not a performance problem; it is a safety problem. In the other direction, a 230 V heater on a 110 V supply will simply produce about a quarter of its rated heat — disappointing, but not a safety issue.
Some electronics are "dual voltage" and say so on the label — phone chargers and laptop power supplies usually are. Heating elements generally are not.
An adapter does not fix it
This is where people get caught. A travel adapter is a piece of plastic that changes the shape of the pins so they fit a different socket. It does nothing at all to the voltage flowing through them.
What does change voltage is a transformer or step-down converter — and one rated for a 1,500–2,000 W heater is a heavy, expensive piece of equipment that usually costs more than the heater and is not a sensible purchase to rescue a $50 order.
The one question to ask before ordering
Before you buy a heater from an international seller, send this in writing and keep the reply:
"What is the voltage and wattage of the unit you will ship to [your country], and what plug type does it have?"
If the seller answers clearly, you are covered and you also get the wattage you needed anyway. If the answer is vague, or is about plug adapters rather than voltage, treat that as the seller telling you it does not know or will not commit.
Buyers in Australia, New Zealand and across Europe have repeatedly reported receiving 110 V units from direct-to-consumer heater sellers. If it happens to you, the 30-day money-back window is what you fall back on — so raise it immediately rather than waiting, and check who pays the return shipping before you send anything back.
Frequently asked questions
Can I use a 110 V heater in Europe with an adapter?
No. An adapter changes the pin shape, not the voltage. A 110 V heater on a 230 V supply is unsafe. You would need a step-down transformer rated for the full wattage, which typically costs more than the heater.
How do I know which voltage my country uses?
Check the label on any appliance already in your home — it will state the input voltage. Broadly: the Americas and Japan are 100–127 V; most of Europe, Africa, Asia and Oceania are 220–240 V.
What if the seller does not publish the voltage?
Ask in writing before ordering and keep the answer. If no clear answer comes back, that is a meaningful signal about the rest of the product page.
Sources
- Trustpilot buyer reports for wellheater.com and heatoor.com concerning voltage mismatches on international orders. Accessed 12 September 2026.