Does the WattLock Energy Saver work?
Updated October 2026 · WattLock UK team
A straight answer: how WattLock is designed, what changes your results, and how to check for yourself.
Quick answer
WattLock is designed to work on the whole socket circuit it's plugged into. Results vary with your appliances, number of circuits and tariff, so we never promise a fixed saving. The fair way to find out is to test it in your own home – risk-free with our 30-day money-back guarantee.
What WattLock is designed to do
WattLock contains a TrueWatt circuit built around an approved capacitor, inside a fire-resistant casing with a British 3-pin plug. Plugged into a socket, it works on the whole circuit it's connected to, day and night, without an app, Wi-Fi or batteries. It's based on the power-correction principle used in large commercial equipment, scaled down for a home socket. Read more in how does WattLock work?
What affects your results
Your appliances
Homes running fridge-freezers, washing machines, pumps and older appliances differ from homes with mostly LED lights and electronics.
Circuits covered
One WattLock covers one socket circuit. Leave a circuit without one and it isn't covered.
Tariff and usage
Your unit rate, standing charge and daily habits all shape your bill.
Season and weather
Winter evenings, heating and drying clothes indoors change usage a lot – compare like with like.
Who is most likely to notice a difference?
More likely if you…
- Run fridge-freezers, washing machines or tumble dryers every day
- Have older appliances with motors or compressors
- Fit one WattLock on every socket circuit
- Track usage with a smart meter or regular readings
May see little change if you…
- Already use very little electricity
- Mostly run LED lighting, phones and laptops
- Only fit one unit in a home with several socket circuits
- Expect a fixed or guaranteed bill reduction
Order WattLock
Up to 62% off- 1Enter delivery address
- 2Pay securely
- 3Dispatched with tracking
Free UK delivery
30-day money-back guarantee. Not happy? Send it back for a full refund. Read the terms. Secure Shopify checkout, prices include VAT.
How to test WattLock at home
- For 7 days before fitting, note your daily kWh from your smart meter, or take a meter reading at the same time each day.
- Check your fuse box and fit one WattLock on every socket circuit – see how to use WattLock.
- Keep recording the same readings for the next 2–4 weeks with your usual routine.
- Compare similar days – weather, daylight and laundry days make a big difference.
- Not happy? Email us within 30 days of delivery for a full refund – see returns.
| Day | Reading time | kWh used that day | Notes (weather, washing, guests) |
|---|---|---|---|
| Week 1 – Mon | Before fitting | ||
| Week 1 – Tue | |||
| … | |||
| Week 3 – Mon | After fitting | ||
| Week 3 – Tue |
Energy saver myths vs facts
| Claim | Myth or fact? |
|---|---|
| Any plug-in energy saver will halve your bill | Myth – no honest seller can promise a fixed saving |
| One unit covers the whole house | Myth – you need one per socket circuit |
| Results depend on your appliances and habits | Fact |
| You need an electrician to fit WattLock | Myth – it plugs into a standard UK socket |
| You can check results yourself with your meter | Fact – compare similar days before and after |
| WattLock needs an app or Wi-Fi | Myth – no app, Wi-Fi or batteries |
Is WattLock the same as cheap "energy saving boxes"?
No. Unbranded boxes sold on marketplaces often come with little information about who makes them, no UK support and no clear returns policy. WattLock is built to the UK plug standard with a fire-resistant casing, sold only through this official website, and comes with free tracked UK delivery and a 30-day money-back guarantee. Before buying any plug-in device, check who sells it and how you can return it. See is WattLock safe?, is WattLock legit? and our honest WattLock review.
Does WattLock work? Questions
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