Best Smart Electric Panel Heaters UK [2026]: Wi-Fi Control and Running Costs
How this guide was made: this is a research-based roundup, not a hands-on lab review. Picks are based on manufacturer specifications, verified UK owner reviews, independent published test results, price history and what UK buyers are actually choosing. More on the method.
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Which smart panel heater should I buy?
For a wall-mounted, app-controlled heater, the Mill Glass Wi-Fi Gen 4 adds Matter and Zigbee support, while the Dimplex Alta Wi-Fi offers adaptive start and open-window detection from a long-established UK brand. A 1.3kW panel costs about 34p an hour at full power under the October 2026 cap.
The garden office is freezing until lunchtime, the loft conversion has no radiator, or you live in a flat with no gas. A wall-mounted panel heater can heat these spaces properly — and the smart ones stop you paying to heat an empty room.
I've compared these from manufacturer specifications. I haven't tested them in my own home.
The Short Version
The Mill Glass Wi-Fi Gen 4 is the smart-home-friendly choice, with Matter and Zigbee. The Dimplex Alta Wi-Fi is the established UK brand with adaptive start and open-window detection.
When a Panel Heater Makes Sense
Electric heat costs about three times as much per kWh as gas under the October 2026 cap. So a panel heater is best for spaces your central heating doesn't reach, or homes without gas — not for replacing gas radiators.
The Picks
Mill Glass Wi-Fi Gen 4 (1300W) — best smart features
Mill lists the GL1300WIFI4 at 1,300W for rooms of 15–19m², with Wi-Fi, Zigbee 3.0 and Matter, a heating element with a maximum surface temperature of 57°C, and a 5-year warranty. Other wattages are available from 400W to 1,300W.
Check current price of the Mill Glass Wi-Fi heater
Dimplex Alta Wi-Fi — best established UK brand
Dimplex lists Adaptive Start (it learns when to switch on to reach temperature on time), Open Window Detection and an electronic thermostat accurate to 0.2°C. Dimplex gives a two-year guarantee, extended on some ranges if you register.
Check current price of the Dimplex Alta Wi-Fi
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Comparison Table
| Mill Glass Wi-Fi Gen 4 | Dimplex Alta Wi-Fi | |
|---|---|---|
| App control | Mill app | Dimplex app |
| Smart home | Matter, Zigbee 3.0 | Check listing |
| Open-window detection | Check listing | Yes |
| Adaptive start | Check listing | Yes |
| Guarantee | 5 years | 2 years (extendable on some ranges) |
Sizing and Running Costs
Use the maker's room-size guidance — a heater that's too small runs flat out and never gets the room warm. At 26.32p per kWh (the Ofgem price cap average for electricity paid by Direct Debit, 1 October to 31 December 2026), a 1,300W panel costs about 34p an hour at full power. The thermostat cycles it off once the room is warm, so real costs are lower. From 30 years in electrical engineering: a well-controlled heater that matches the room usually costs less to run than an undersized one left on full.
The Verdict
Buying GuideChoose the Mill Glass Wi-Fi Gen 4 if you want it in Apple Home, Google Home or Alexa via Matter. Choose the Dimplex Alta Wi-Fi for a long-established UK brand with adaptive start. For portable heat in one room, see our oil-filled radiator guide.
Sources
• Mill: Glass Smart Wi-Fi Panel Heater 1300W Gen 4
• Dimplex: Alta Wi-Fi Panel Heater
• Ofgem: October–December 2026 price cap rates
*Researched October 2026 from manufacturer specifications, official guidance and independent UK sources; we do not test products in our own home. Prices change often — always check the current price before buying. This article contains affiliate links — see our disclosure.*
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