One outlet, no electrician
It is described as a plug-in unit. You push it into a wall outlet and that is the whole setup. Nothing is wired into your fuse box.
// Plug-in energy saver
Your meter decides.
StopWatt is a small unit that plugs into one wall outlet. Sellers say it steadies the power in your home and trims waste. We do not print a savings figure, because only your own meter and bill can show what happens in your house. This site gives you the tools to check.
// The product
What StopWatt is.
Here is the plain description, with seller claims marked as claims.
Steadier power, less waste
Sellers say it steadies voltage or corrects power factor, and that this lowers what you use. This is a claim, not something we have measured.
One unit, one outlet
A single plug sits at a single point in your wiring.
Your appliances
Heaters, fridges and air conditioners still draw what they draw.
No made-up numbers
No savings figure, no fake reviews, no countdown timers.
// How it works
Claims, and how to check them.
Homes are billed for the kilowatt-hours that pass through the meter. So any real saving has to show up as fewer kilowatt-hours. Here is how each common claim can be tested.
| Claim | What it would mean | How you can check |
|---|---|---|
| Lower bill | Fewer kWh on the meter for the same use. | Compare bills from the same season, or use the meter test below. |
| Power-factor correction | Matters mainly where large motors run, such as factories. Homes are normally billed on kWh alone. | Ask your electricity provider whether your tariff charges for power factor at all. |
| Steadier voltage | May protect some equipment, but does not by itself cut energy use. | Ask the seller for a model-specific test report with ratings. |
| Easy to fit | Plugs in without tools. | You can see this the moment you open the box. |
Before you buy
- Read the full total at checkout, including any add-ons or bundles.
- Get the money-back terms in writing, with the deadline and who to contact.
- Ask for specifications and test reports for the exact model.
- Be wary of countdown timers and unnamed reviewers.
How to test fairly
- Record your usage for at least a week with no device.
- Then record a week with it fitted, using the same appliances.
- Account for weather, since heating and cooling swing usage a lot.
- Read the meter at the same time each day.
Specifications such as power rating, dimensions and certifications were not available to us. Add them from the supplier's data sheet before you rely on this page.
// Bill check
Two tools. Your own numbers.
The first shows what a saving would be worth. The second compares two real weeks from your meter. Starting values are examples only.
What-if bill calculator
The saving percentage is your assumption, not a promise.
3% less electricity
- Bill per year
- 0
- Value of assumed saving
- 0
- Saving needed to repay
- 0
- Payback
- 0
Meter test: before and after
Enter your average daily kWh from a week without the device and a week with it.
- Change per day
- 0
- Change
- 0
A week-to-week change under about 5% is usually just weather and daily habits. Repeat the test across several weeks before you trust a result.
// FAQ
Straight answers.
What is StopWatt?
A small plug-in unit sold for home outlets. Sellers describe it as steadying voltage and cutting wasted electricity.
How much will it cut my bill?
No trustworthy figure exists that we can give you. Seller advertisements quote large percentages, but independent reviewers have not found evidence for them. Use the meter test to measure your own result.
Why would one plug affect the whole house?
That is the key question to put to any seller. Your appliances still draw the power they need, and your meter counts the kilowatt-hours they use. Ask for model-specific test results that explain the effect.
Do I need an electrician?
Sellers say no. It plugs into an outlet. Follow the instructions in the box, and do not use it with damaged sockets or cords.
What should I check before paying?
The full checkout total including add-ons, the money-back terms in writing, and the model's published ratings and test reports.
What actually lowers an electricity bill?
Efficient appliances, LED lighting, switching off standby loads, sensible heating and cooling settings, and a tariff that suits when you use power. Your provider can often show you a usage breakdown.