Review · plug-in energy saver

EcoWatt review – does a plug-in energy saver really lower your electricity bill?

EcoWatt is a small device you plug into a wall socket. The seller says it stabilises the power in your home, filters "dirty electricity" and cuts most families' bills by 30–50 %. Consumer organisations have tested plug-in power savers of this kind and found no measurable savings – and, in several tests, safety failures. We have not tested EcoWatt itself. Here is what the seller claims, what the tests found, and what to check before you buy.

Seller claims shown next to independent test results
Why household meters don't bill reactive power
Safety points to check before plugging anything in
Seller, guarantee and returns – what the order page says

See the EcoWatt offer

Advertisement: the button links to the seller's offer. We may earn a commission.

Claims vs. tests

What the seller says – and what independent tests found

Left: statements from the EcoWatt order page (October 2026). Right: findings from consumer organisations that tested plug-in power savers. These tests covered the device category, not EcoWatt specifically.

Seller claim	What independent sources say
"Most families save between 30 % and 50 % on their monthly power bills"	Which?, Electrical Safety First and Verbraucherzentrale NRW found no measurable savings from plug-in power savers.
Power-factor correction / "cleans dirty electricity"	Household meters bill active energy. Reactive power is generally not charged to private households (Verbraucherzentrale NRW).
"UL-certified safety"	No certificate number is shown. In UK tests, all eight plug-in savers bought online failed electrical safety standards (Which?, 2025).
"Helps appliances run longer"	We found no independent evidence for this.
"60-day 'Sure-Save' guarantee – lower your bill or pay nothing"	A seller promise. Check the conditions at checkout and keep your bills for comparison.

Seller statements are quoted from the order page and are not our claims.

How billing works

Why a plug-in box can't shrink your bill

You don't need an engineering degree – three points explain the test results.

You pay for active energy

Your meter records kilowatt-hours of active (real) energy. That is what your fridge, oven and TV actually use, and a box in another socket does not change it.

Reactive power isn't on your bill

Power-factor correction reduces reactive power. Large businesses can be charged for that – private households in the UK and EU generally are not.

The box uses power itself

When Verbraucherzentrale NRW opened such devices, they found a surge protector, an LED and a functionless block. The LED itself draws a little electricity.

Source: Verbraucherzentrale NRW, March 2026

The tests

What consumer organisations found

Summaries of published tests and warnings on plug-in energy-saving devices.

Which? (UK, 2025)

Tested eight plug-in "energy-saving" devices bought from major online marketplaces: no evidence of savings, and all eight failed UK electrical safety standards – including undersized pins and missing fuses.

Which?, 12 May 2025

Electrical Safety First (UK)

The charity reports that manufacturers' energy-saving claims were shown to be unjustified in its testing, with hazardous safety failures in the products tested.

Electrical Safety First

Verbraucherzentrale NRW (Germany, 2026)

Calls plug-in power-saving boxes completely ineffective for private households and refers to warnings from the German Federal Network Agency.

Verbraucherzentrale NRW

Safety

Before you plug in any energy-saving device

Look for a proper safety marking (UKCA or CE) and the manufacturer's name and address on the device and packaging.
In the UK, a plug must meet BS 1363 – with correctly sized pins and a fuse. Which? found plug-in savers that did not.
If the device gets hot, smells, buzzes or the casing is loose, unplug it and do not use it.
Never plug a device into an adapter or extension lead that is already heavily loaded.

What actually works

Proven ways to cut your electricity bill

Compare your tariff
Switching tariff or supplier often saves more than any gadget.
Find the big consumers
A plug-in energy meter shows what each appliance really uses. Old fridges and freezers, tumble dryers and electric heaters are frequent culprits.
Cut standby
Switchable power strips stop TVs, consoles and chargers drawing power when not in use.
Switch to LED
LED bulbs use a fraction of the electricity of old bulbs.

The offer

If you still want to try EcoWatt

The order page offers single units and multi-packs with a "Sure-Save" guarantee. If you order, read the guarantee conditions and keep your bills from before and after.

1–4

Units per order

The seller offers packs of one to four devices. One device is meant to be plugged in near the fuse box.

Days guarantee (seller)

"Lower your bill or pay nothing" – check how a refund is requested and whether return shipping is charged.

USA

Seller address

The order page names NH Discounts LLC, Salem, New Hampshire, USA. Allow for shipping times and possible customs charges.

Check the EcoWatt offer at the seller

Advertisement: the link goes to the seller. We may earn a commission – the price is not affected.

Questions and answers

Frequently asked questions about EcoWatt

Does EcoWatt save electricity?

We have not tested EcoWatt itself. Consumer organisations that tested plug-in power savers – Which?, Electrical Safety First and Verbraucherzentrale NRW – found no measurable savings, and the physics of household billing explains why.

Is EcoWatt a scam?

We can't judge the seller's intentions. What we can say: the advertised 30–50 % savings are not supported by independent tests of this device type, and the seller's safety and customer claims are not documented.

Is it safe?

We could not verify a safety certificate for EcoWatt. In UK tests, every plug-in saver bought online failed electrical safety standards. Check the markings and the plug before you use any such device.

What is power-factor correction?

It reduces reactive power – power that flows back and forth in the grid without doing useful work. Businesses can be billed for it; private households in the UK and EU generally are not, so correcting it does not lower a home electricity bill.

Who sells EcoWatt?

The English order page names NH Discounts LLC, Salem, New Hampshire, USA. We do not sell the product – we link to the seller's offer and may earn a commission.

Can I get my money back?

The seller advertises a 60-day guarantee. The conditions are on the order page and in the seller's terms. Your statutory consumer rights apply regardless.

Verdict

EcoWatt review: our verdict

We cannot recommend EcoWatt as a way to lower your electricity bill.

What speaks for trying it

a money-back guarantee, if the conditions are fair and you keep your bills

What speaks against it

independent tests of plug-in power savers found no measurable savings
household meters don't bill the reactive power these devices target
safety failures were common in tests of this product type
proven measures – tariff, standby, LED – save more

Our assessment: the savings EcoWatt advertises are not supported by independent evidence for this type of device. If you want to lower your bill, start with your tariff and your biggest appliances. We have not tested EcoWatt ourselves; seller statements come from the seller's order page.

EcoWatt: see the seller's offer

If you want to check the offer and guarantee conditions yourself, the button takes you to the seller's order page.

See the EcoWatt offer at the seller

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