WattLock Energy Saver FAQ

WattLock is a small plug-in device built to the UK plug standard. You plug it into an ordinary 3-pin socket and a green light shows it's on. There's no wiring, no app and no subscription.

A TrueWatt circuit built around an approved capacitor, in a fire-resistant casing with a UK 3-pin plug.

About the size of a phone charger, so it sits discreetly on a wall socket.

No. WattLock doesn't need an app, Wi-Fi or batteries.

Results depend on your home, your appliances and your tariff, so we can't promise a fixed figure. Every order comes with a 30-day money-back guarantee: check your smart meter or your next bill, and if you're not happy, send it back for a full refund.

Yes. You keep your supplier, your tariff and your habits. Nothing else changes.

One WattLock per circuit. A flat or small bungalow usually needs 1, a 2–3 bed house 2 (one downstairs, one upstairs), a house with a separate kitchen circuit 3, and a large home or one with an extension or garage 4. Count the switches labelled 'sockets' or 'ring' in your fuse box.

No – one per socket circuit, not per room. Most homes need one to four.

Open your consumer unit (fuse box) and count the switches labelled sockets, ring, kitchen or similar. Lighting, cooker and shower circuits don't count.

Switch off one socket breaker at a time and check which sockets go dead, or order the 2-pack, which suits most 2–3 bed houses.

Yes. It simply plugs in, so it's ideal for renters and you can take it with you when you move.

No. It plugs into any standard UK socket in under 10 seconds. No tools and no rewiring.

Any free socket on the circuit. A socket near your busiest appliances, such as in the kitchen, is a sensible choice.

Plug it straight into a wall socket for the best connection rather than an extension lead or adaptor.

The green light shows WattLock is plugged in and receiving power.

Yes. WattLock works with any meter type and doesn't change how your meter records usage.

Yes, it plugs into ordinary sockets as normal. It doesn't connect to your inverter or battery.

EV chargers are usually on their own dedicated circuit without a standard socket, so WattLock isn't used on them.

WattLock is designed to stay plugged in. It uses an approved capacitor and a fire-resistant casing and is built to the UK plug standard.

Treat it like any plug-in device: keep it on a wall socket and don't let children play with it.

Email us. Units that develop a fault are covered under our guarantee.

£39 for 1, £59 for 2, £78 for 3 and £117 for 4. All prices include VAT and free tracked UK delivery.

The 3-pack works out at £26 per unit, the lowest price per device.

The 2-pack, as it suits most 2–3 bed houses with one socket circuit upstairs and one downstairs.

The bundle prices on this site are our best prices. Buying more units in one order lowers the price per unit.

Yes. Enter the recipient's address at checkout. Our parcels don't include a price slip.

Delivery is free to UK addresses. Orders are usually dispatched within 1–2 working days, and you'll get tracking by email.

You'll receive a confirmation email and a tracking link by email once your order has been dispatched.

Not at the moment – we only ship to UK addresses.

Checkout is handled by Shopify's secure payment page. You can pay by Visa, Mastercard, American Express, Apple Pay or Google Pay.

Yes. Payments are processed on Shopify's encrypted checkout. We never see or store your full card details.

No. You just enter your delivery details and pay.

If you're not happy, email us within 30 days of delivery and return your units for a full refund.

Yes. Our 30-day money-back guarantee covers used units – see the returns page for how.

Once we receive your return, refunds are usually processed within a few working days to your original payment method.

You're on it. wattlock.co.uk is the official UK website for the WattLock Energy Saver. Genuine WattLock units are only sold here.

No. It's sold online only, through wattlock.co.uk. Listings elsewhere may be lookalike products.

Email our UK support team from the contact page. We reply as quickly as we can on working days.