When is 1600 Watts only 1430 Watts?
This month Consumer Reports reviewed a handful of popular high-end hair dryer models and included each dryer’s claimed power and the power they measured:
| Product | Advertised Watts | Measured Watts |
| Dyson Supersonic | 1600 | 1430 |
| Drybar Buttercup | 1875 | 1420 |
| ghd Helios | 1875 | 1440 |
| RUSK W8less | 2000 | 1470 |
All of these models use nearly the exact same power though their advertised power ranges from 1600 to 2000 Watts. What is going on? All of these companies are using a bit of Marketing Magic. One of them seems to be just wishful thinking.
What’s Watts?
The electrical power that a hair dryer uses is measured in Watts. Some of that power is used to blow air, some is lost as noise or light, and most of it is converted into the heat that will dry your hair. It’s fair to say that a dryer with higher Watts will emit more heat and dry hair faster.
Amps X Volts = Watts
Most household electrical outlets in the USA are rated for a maximum of 15 Amps. If a product actually draw 15 Amps it is likely to trip the breaker or blow the fuse – especially if anything else is on, like the bathroom light. And people usually dry their hair with the lights on. (This can even cause a fire – plenty of older homes have imperfect wiring, especially in bathrooms that were added on.) Obviously this would be inconvenient and possibly very dangerous.
As a result, for years the safety standards have only allowed appliances to draw a maximum of 12 Amps.
Electricity is nominally delivered at 120 Volts. What you actually will get at home depends on all kinds of variables, but the specified range is from about 113 to 127 Volts. Your bathroom outlet is often bit under 120, but let’s use that 120 Volts:
12 Amps X 120 Volts = 1440 Watts
Does that seem familiar? CR measured all of these dryers at 1440 Watts plus or minus 2%.
Watts up?
US electrical safety rules allow for products to vary from their Rated Watts by plus or minus 10 percent. In practice, manufacturers can hold the Watts much more closely than this. So manufacturers target production at 90% of the Rated Watts. This is the first bit of Marketing Magic, and has been common practice for decades:
90% of 1600 Watts = 1440 Watts
So a “1600 Watt” hair dryer is really a 1440 Watt hair dryer.
How did Consumer Reports measure the Supersonic at 1430 Watts?
If the Supersonic really is at 1430 Watts, it is technically out of spec to be called 1600 Watts. But it’s likely that Consumer Reports was getting a little under 120 Volts during their testing, or their measuring equipment is a tiny bit out of spec.
So how do some dryers get to 1875 Watts?
By the mid-1990s most companies in the business had 1600 Watt dryers. Competitive pressure presumably led to someone asking “How can we get a higher Watts rating?” Someone replied “Increase the Amps and Volts used in the rating!” They pushed it from both sides:
15 Amps X 125 Volts = 1875 Watts
Seems brilliant, right? 125 is within the 113 to 127 Volt range for household electricity, so in theory a someone might get 125 Volts at their bathroom outlet. (I’m unclear on how they leap from 12 to 15 Amps.) In the end it’s a rating achieved by a change in the test conditions, and not by any meaningful changes to the product. A consumer won’t actually see 1875 Watts, any more than they ever saw 1600 Watts.
Marketing Magic! In practice, the consumer is much more likely to get 120 Volts or less in their home, and observe 1440 Watts or less from their hair dryer.
(To be rated at 1875 Watts, a dryer has to pass all of the standard safety tests at 125 Volts instead of at 120 Volts, which will make everything hotter & the tests more challenging to pass. This may require some upgrades in materials and components & some increase in cost.)
Why stop at 1875 Watts?
Rating a dryer at 125 Volts lets it be advertised at 1875 Watts and gives it a marketing advantage. Why stop there?
2000 Watts!
RUSK marks their W8less dryer as 125 Volts and 2000 Watts. That implies that they are getting 16 Amps! We never saw 15 Amps, how are they getting even more?
Back to our table, RUSK measures 1470 Watts: RUSK isn’t getting any more power. They just say it does.
RUSK is a “salon” brand, not a “consumer” brand. Salon products have traditionally been sold through stylist-only specialty stores. These stores don’t always require that electric appliances be certified for compliance with safety requirements, indicated by a mark from UL, ETL, or some other third-party certifying body. RUSK is going footloose and certification-free because the stores selling the product don’t care. RUSK has gone right past Marketing Magic and is simply Making It Up. It’s all hot air.



