Best Home Energy Monitors UK 2026

Why Bother?

You can't manage what you can't see. Most people have no idea how much electricity their heat pump uses, whether their solar panels are actually generating what the installer promised, or which appliances are quietly draining money. An energy monitor puts a number on it, in real time, not on a quarterly bill you've already forgotten about.

If you've just had a heat pump installed, a monitor answers the question everyone asks: "Is this thing actually saving me money?" If your monitor shows your heat pump drawing 5,000 kWh per year when it should be closer to 3,500 kWh, something's wrong: maybe the flow temperature is set too high, or you've got an insulation problem. Without a monitor, you wouldn't know until you got a surprisingly large electricity bill.

Our Picks

Best Overall: OWON 3-Phase WiFi Monitor

The OWON ships with three 80A CT clamp sensors that clip around the main live cable in your consumer unit. No electrician, no re-wiring; the clamps never touch live parts. It takes about ten minutes to fit and connect to the Smart Life app on your phone. Real-time watts, daily and monthly kWh, cost estimates: everything's there.

Three clamps is the big thing. One on your main tail gives you whole-house usage. The other two can go on your heat pump circuit, your EV charger, your solar inverter, or any big circuit you want to track separately. Most single-clamp monitors can't tell you how much your heat pump is actually drawing; this one can.

Buy this if: you want the best-value whole-house monitor and you're happy using a phone app rather than a standalone display.

Best for Solar: OWON Bi-Directional Monitor

Standard energy monitors see how much is flowing but not which direction. That's a problem for solar households: if you're exporting on a sunny day, a one-way monitor just reads "low usage" and misses the full picture. The OWON Bi-Directional has two CT clamps that track direction of flow, so you get genuine import, export and self-consumption numbers separately.

It's cheaper than the Shelly Pro 3EM and simpler to fit; DIY clamp-on install for most single-phase homes. If all you want is a clear "this is what I imported from the grid, this is what I sent back" number each month, this is the sweet spot. If you need per-circuit breakdowns or Home Assistant integration, step up to the Shelly.

Buy this if: you have solar panels and want a simple, single-phase solution that actually sees export.

Best Standalone Display: Efergy Elite Classic 4.0

Not everyone wants to unlock their phone to check what the oven's drawing. The Efergy Elite gives you a dedicated wireless display that you can stick on the kitchen counter. Real-time watts, live cost per hour, daily and weekly totals: all on a screen you'll actually glance at.

It's been on the market since 2009 with over a thousand Amazon reviews at around 3.9 stars. Single CT clamp, no WiFi, no app, no account. Fit it yourself in ten minutes. Runs on batteries (two 3V CR2032s for the display), so no routers or cloud services to worry about. It's the least-exciting option on this list, but for someone who just wants a usable number visible in the kitchen, it's the right answer.

Buy this if: you want a display on the counter, hate phone apps, and don't need per-circuit or solar breakdowns.

Best Free: Loop (Smart Meter App)

If you've got a SMETS2 smart meter (the second-generation type that's been rolled out by default since 2019) try Loop before spending any money. It's a free app that connects to your meter via the DCC (the secure comms network all smart meters use) and gives you 10-second live usage, historical trends, and automatic tariff comparison. It doesn't touch your WiFi and doesn't need any hardware.

The catch: it's slightly less responsive than a clamp-on monitor (10–30 second lag vs near-instant), and occasionally flaky if your meter's DCC connection drops. You also can't get per-circuit or import/export breakdowns like you can with a proper clamp sensor. But for free? Absolutely worth trying first.

Use this if: you have a SMETS2 meter and want to see what data's available before buying anything.

Best for Home Assistant: Shelly Pro 3EM

This is the power-user pick. The Shelly Pro 3EM mounts on a DIN rail inside your consumer unit (needs an electrician), measures three phases at up to 120A each, and exposes everything via local REST API and MQTT. Zero cloud dependency; it works if your internet goes down. The device stores 60 days of one-minute readings on-board, so even if your network falls over, you don't lose data.

For a household running solar, an EV charger, and maybe a heat pump, this is the only monitor on this list that can give you a genuinely complete real-time picture. Class B accuracy (±1%) means the numbers stand up to utility-grade logging. And if you're running Home Assistant, Node-RED or openHAB, the Shelly integrations are first-class. For everyone else, it's overkill; the OWON 3-Phase does 80% of the job for a third of the price.

Buy this if: you run a smart home platform, have solar + EV, and want proper local data.

What You Don't Need

• Don't rely on your smart meter's In-Home Display alone. IHDs show live usage but no proper historic data and no export. You can't analyse patterns or catch a misbehaving heat pump. Use Loop for free instead: same data, proper analytics.
• Don't buy a cheap no-name clamp monitor without a working app. There are £20 monitors on Amazon with five-star reviews from people who used them for a week. Check review dates. A cheap clamp without a usable app is just a wattage readout; no history, no export, no value.
• Don't buy Emporia Vue or Sense from the UK. Both are US products with no official UK distribution. Grey-imported units usually work, but warranty support is patchy and firmware updates can be region-locked. Stick with UK-supported options.
• Don't expect whole-house monitors to break down individual appliances. A three-clamp monitor can track a few circuits; it can't tell you what your PlayStation costs on standby. For per-appliance data, use energy-monitoring smart plugs (from £8 each). Most homes end up with both.

What to Actually Do With Your Monitor

Track Your Heat Pump

A well-running heat pump in a well-insulated home should use roughly 3,000–5,000 kWh per year for heating and hot water. If your monitor shows significantly more, something's off. The usual culprits: flow temperature set too high (ask your installer to check), poor insulation letting heat escape faster than the pump can replace it, or the system running at times when it doesn't need to. Catching these issues early saves hundreds of pounds a year.

Shift Your Solar Usage

With solar panels, the golden rule is: use your own electricity instead of exporting it. Your monitor shows you when you've got surplus generation; that's when you should be running the washing machine, the dishwasher, or charging your car. Even shifting one or two big appliances into peak solar hours saves £100–£200 per year. It becomes second nature after a week or two.

For the bigger picture on cutting your bills, see our energy efficiency guide. If you're sizing a solar system, our solar sizing guide explains how to match generation to your usage.