Energy-saving devices that work with Home Assistant

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The power-user's Wi-Fi plug: HA's excellent core shelly integration talks to it locally and push-updates instantly, with proper 13A/3000W rating and precise power metering. At roughly double a Tapo P110 or SONOFF S60ZBTPG, it earns its keep — a local RPC API keeps automations running if the internet drops, and on-device scripting can enforce power limits without HA in the loop. Standby draw is under 1W, so running it 24/7 costs pennies a year. At 60 x 60 x 56mm it's a chunkier cube than the P110, so check it won't block a neighbouring socket. (The smaller Plug S Gen3 is EU-pin only — this is the BS1363 model.)

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The default UK smart plug: cheap, everywhere, and HA's core tplink integration polls it locally with per-plug energy stats that are accurate enough for tumble-dryer automations. Buy multipacks — Tapo's own store runs the 2-pack for well under £8/unit and the 4-pack cheaper still, beating a single Amazon unit outright. Prefer Zigbee mesh or don't want another Wi-Fi device on the router? The SONOFF S60ZBTPG matches it on price and load rating without eating Wi-Fi bandwidth. Need to monitor a whole extension lead instead of one socket, look at the Tapo P304M power strip. For a single always-on appliance on Wi-Fi, the P110 is still the easiest, cheapest option.

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The premium pick: officially Works with Home Assistant certified (Eve joined the programme in April 2025), connecting via Matter-over-Thread with energy monitoring, 100% local control and no cloud account at all. At £39.95 it's roughly seven times IKEA's GRILLPLATS (£6, also Matter-over-Thread) and three times SONOFF's Zigbee S60ZBTPG or TP-Link's Tapo P110 — you're paying for the WWHA certification and Eve's own energy cluster, built with HA's developers, avoiding the stuck-at-zero cumulative-energy bug on cheaper Matter plugs. It's compact (72 x 72 x 71mm) though Eve doesn't publish a standby-power figure. You'll need a Thread border router (ZBT-1/SkyConnect, Apple TV or HomePod); each plug also strengthens the mesh.

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A three-phase DIN-rail energy meter with three clamp CTs, and the one to buy for whole-home monitoring if you have a three-phase supply or want per-phase readings; on single-phase UK homes it still works, you simply use one clamp, though a single-phase Shelly EM is cheaper. It needs mounting in the consumer unit, so it is an electrician job or at least confident-DIY with the supply isolated. The Home Assistant integration is local with no cloud account needed, and that is the big reason to choose it over cloud-only monitors. This listing is the current 120A V2 version, and Amazon's other Pro 3EM listings use different current ratings (63A clamps), so match the clamp rating to your supply.

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The budget king for Home Assistant TRVs: around £22 a radiator versus £60+ for the Bosch Radiator Thermostat II, with equally solid Zigbee2MQTT/ZHA support and no hub or cloud dependency. The trade-off is build quality and running costs — three AA batteries typically last only around six months (versus roughly two years on the Bosch), and the plastic body and motor feel noticeably cheaper. Fits M30x1.5mm valves directly, with adapters in the box for Danfoss RA/RAV/RAVL, Caleffi, Giacomini and M28. Best suited to whole-house rollouts on a budget rather than the one or two rooms where you want set-and-forget accuracy.

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Aqara's 2025 TRV launched specifically for the UK market, and unlike the older E1 it does Thread: flip it to Thread mode and it joins Home Assistant over Matter with no Aqara hub at all. At £49.99 it undercuts the tado X radiator valve while matching the no-hub trick — but that convenience costs you valve position, battery reporting and external-sensor pairing in Home Assistant. Want those back? Add an Aqara hub and run it Zigbee instead. It's a compact ⌀57×90mm cylinder fitting standard M30×1.5 valves (six adapters included), and reviewers confirm the under-30dB motor claim — quieter than most rival TRVs, tado's included, so it won't disturb sleep.

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Reads two temperature sensors and battery over the native Shelly integration via BLU Gateway; that's the extent of it, with no climate entity, setpoint, or calibration until you add the community hass_shelly_blu_trv HACS integration plus a dedicated ESPHome Bluetooth proxy, since a Shelly relay won't substitute. Once that's running, precision is genuinely excellent at 0.1°C steps, and 2-year AA battery life beats SONOFF's TRVZB (about 6 months) and matches Bosch. At £51.99 with gateway included it undercuts Bosch (£59.99), but demands more setup graft than the plug-and-play Aqara or SONOFF options; budget an evening, not just an order.

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At £74.99 this is among the priciest TRVs we track — well above a SONOFF TRVZB and the Bosch Radiator Thermostat II — and you're paying for tado's design and near-silent motor, not raw reliability. It joins Home Assistant locally via Matter, through Bridge X or any Thread border router on your fabric. Unlike the AA-powered Bosch and SONOFF, it runs on a removable rechargeable Li-ion pack charged over USB-C roughly once a year — no battery hoarding, but a routine to keep up with. The included six adapters cover 95% of UK valves (M30x1.5mm thread, direct-fit). Buy the Bridge X starter kit first; singles only make sense as add-ons.

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Britain's favourite solar-diverting EV charger, and its energy data slots straight into Home Assistant's energy dashboard via the myenergi HACS integration — though it's cloud-only, so automations depend on their servers rather than local control. Stick with the 7kW single-phase model unless you have a rare UK three-phase supply; the 22kW variant can't charge any faster without it. Tethered and untethered cost roughly the same, so pick tethered for convenience. Budget £400-700 on top of the unit price for professional installation. If you own your home with a driveway you won't qualify for an OZEV grant — that's reserved for renters and flat owners now.

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The charger Octopus pushes hardest for Intelligent Octopus Go households, and for good reason — its own smart-scheduling already targets your cheap-rate window, so pairing it with Home Assistant is mostly about layering extra automations (solar-aware boosts, notifications) on top rather than replacing what it already does. Ohme now has an official core Home Assistant integration (no HACS install needed), which puts it on firmer footing than community-maintained rivals like the Hypervolt entry also on this site — though it's still entirely cloud-dependent, same as every EV charger catalogued here.

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Sits between the Zappi and Ohme Home Pro already on this site: no built-in solar diversion like the Zappi, but a genuinely well-maintained community integration that exposes session data, schedules and charge state cleanly — HA can watch your solar export and start/stop/throttle charging in response, which gets you most of the way to Zappi-style behaviour through automations instead of dedicated hardware. Like Ohme, it's cloud-dependent (websocket pushes from Hypervolt's own API), so there's no local fallback if their servers are down.