If your home runs on electricity rather than gas — a flat, a rural property, or a house that's never been connected to the mains gas network — a smart storage heater is the most efficient way to heat it affordably. Modern units charge their ceramic bricks overnight using cheap Economy 7 or off-peak EV tariff electricity, then release that warmth steadily throughout the day, automatically adjusting to match your usage patterns. Compared with the clunky manual heaters of the 1980s, today's smart models can cut running costs by up to 27% while keeping you warm with zero effort.
How Smart Storage Heaters Work
All storage heaters operate on the same principle: an internal stack of high-density ceramic bricks soaks up electrical energy overnight, stores it as heat, and radiates it gradually during the day. The difference between a basic model and a smart one lies in the automatic charge control system. A manual heater relies entirely on the user turning a dial the evening before to guess how much heat will be needed. Get it wrong and you either run out by lunchtime or waste stored heat late at night when you're asleep.
A smart storage heater has sensors and algorithms that learn your household's usage pattern, monitor the room temperature and — in the most advanced models — check external weather conditions. Each night during the cheap-rate window it calculates precisely how much charge it needs for the following day, loading only what's required. The result is less wasted electricity and a room that stays comfortable from morning to evening without any manual adjustment.
Single-supply wiring is another key modern feature. Older storage heaters required a dedicated twin supply: a normal live feed plus a separate Economy 7 switched feed from the meter. Some newer models, such as the Elnur Ecombi ECOSSH range, include a built-in digital time switch so they can be wired from a single supply, making them far simpler to retrofit in homes that don't already have Economy 7 wiring in place.
Economy 7 and Off-Peak Tariffs Explained
Economy 7 is a dual-rate electricity tariff that gives you seven hours of cheap overnight electricity — typically around 00:30–07:30, though the exact window varies by region and meter type. As of Q2 2026, Ofgem's electricity price cap sets the standard unit rate at 24.67p/kWh; Economy 7 night rates from major suppliers currently sit in the range of roughly 12–16p/kWh, with some competitive tariffs below that. If at least 40% of your total electricity consumption falls in the night window, Economy 7 will cost less overall than a flat-rate standard tariff.
Storage heaters are the classic Economy 7 load. But they can also take advantage of newer dynamic tariffs: Octopus Energy smart tariffs such as Octopus Go and Agile can deliver overnight rates well below Economy 7 fixed rates, making them attractive for storage-heater households with a smart meter. Most modern smart storage heaters don't need a Wi-Fi connection to exploit these tariffs — their charge window is set to align with the off-peak period — but those with app control can be fine-tuned remotely if your cheapest hours shift.
The Best Smart Storage Heaters in the UK
1. Dimplex Quantum RF — Best Overall
Best for: most homes replacing old storage heaters. The Quantum RF is Dimplex's flagship high heat retention (HHR) storage heater and the most specified model in new housing developments across the UK. Its dynamic charge-and-control algorithm learns your household's heating pattern over time, factoring in room temperature and external weather data to set the overnight charge level automatically. Three heating timers each offer four daily time-and-temperature slots, giving granular control over when heat is released. Pair it with the optional Dimplex Control Hub and you can manage every heater in the house from the Dimplex app.
The Quantum is Lot 20 compliant (the EU/UK energy efficiency regulation for local space heaters), SAP Appendix Q accredited, and carries the BEAB Approved Mark. Dimplex claims running costs up to 27% lower than a standard storage heater. Models range from 0.5 kW to 1.5 kW storage input; prices start from around £835 inc VAT depending on retailer and model size. A five-year warranty is available on registration. If you want a single model that does everything intelligently without extra gadgets, the Quantum RF is the benchmark.
2. Elnur PROSSH — Best Wi-Fi Smart Storage Heater
Best for: app-controlled, voice-assistant-integrated heating. Elnur's PROSSH range puts full smartphone control at the centre of the experience. Via the optional G-Control Hub, each heater connects to the home Wi-Fi; the Elnur app (iOS and Android) then lets you set schedules, adjust output, check energy consumption, and override the automatic charge level from anywhere. The system is compatible with Amazon Alexa and Google Assistant for voice control.
Four models cover different room sizes: PROSSH158 (975W storage input, suitable for small bedrooms), PROSSH208 (1,300W), PROSSH308 (1,950W), and PROSSH408 (2,600W for larger living rooms). Each model also includes a balancing element — a direct convection heater that supplements stored heat if demand is unexpectedly high. Prices range from approximately £375 to £555 depending on model, making the PROSSH range more affordable than the Quantum. Five-year warranty included. Lot 20 compliant.
3. Elnur Ecombi ECOSSH — Best for Retrofit (Single Supply)
Best for: properties without Economy 7 wiring. The ECOSSH is genuinely unique: its built-in digital time switch means it can operate from a standard single-circuit supply rather than the twin Economy 7 feed that older units need. An electrician simply sets the off-peak window on installation to align with your tariff's cheap hours, and the heater handles the rest. It also supports multiple operating modes — Automatic Ecombi, Storage-only, Combined storage-and-convection, Convection-only, and Frost Protection — so you're never locked into one way of working.
Available models include the ECOSSH208 (1.3 kW) and ECOSSH408 (2.6 kW). The heater is Lot 20 compliant and comes with a five-year warranty. For a landlord upgrading a flat without Economy 7 wiring, or a homeowner in an older property, the ECOSSH avoids the cost and disruption of rewiring.
4. Dimplex XLE Slimline — Best Budget Pick
Best for: smaller rooms and budget-conscious buyers. The XLE is Dimplex's entry-level electronic storage heater and, unlike the Quantum, is not high heat retention — it's classified as a standard electronic storage heater. That matters for running costs: HHR heaters retain heat longer and waste less, so the XLE is best suited to rooms that don't need sustained all-day warmth. What it does offer is a well-made, slimline unit with a seven-day electronic programmer, open-window detection, and an RGB backlit display. Models run from 0.5 kW (XLE070, around £620) to 1.5 kW (XLE150, around £839). For a spare bedroom or occasional-use room, the XLE is a cost-effective solution without the premium of HHR technology.
5. Elnur ECOHHR — Best High Heat Retention Mid-Range
Best for: buyers wanting HHR performance without the Quantum price tag. The Elnur ECOHHR (also marketed as the ECOSSH upgrade) sits between the budget XLE and the premium Quantum. It uses high-density ceramic bricks for genuine HHR performance, has an LCD display with advanced controls, and supports automatic charge calculation. The three models — ECOHHR20, ECOHHR30, and ECOHHR40 — cover 1.4 kW, 2.2 kW, and 3.5 kW storage inputs respectively, making it suitable for larger living areas. Lot 20 compliant with a five-year warranty. For a mid-sized household looking to replace a full set of old manual heaters, the ECOHHR represents strong value.
Buying Guide: How to Choose the Right Storage Heater
Sizing Your Heater
As a rule of thumb, a well-insulated UK room needs approximately 1.2 kW of heating output per 10 m² of floor area. A poorly insulated room — older solid walls, no loft insulation — may need closer to 1.5 kW per 10 m². A typical living room of 20 m² in a reasonably insulated home would therefore call for a 2–2.5 kW storage input heater. Use Dimplex's online heating calculator or the retailer sizing guides from Heater Shop or Electricpoint to get a precise figure before ordering.
Note that wattage figures on storage heaters refer to the input during charging, not continuous output. A 2.6 kW heater running for seven Economy 7 hours uses 18.2 kWh of electricity overnight — at 14p/kWh night rate, that's around £2.55 to fully charge. Compare this with electric vs gas heating costs for a complete picture of whole-home running costs.
Installation
All storage heaters must be installed by a Part P-registered electrician; the work is notifiable under Building Regulations. If your home already has an Economy 7 (or Economy 10) meter and twin-circuit wiring, most standard models can be swapped out directly. If not, budget for the additional cost of a new meter and cabling — or consider the Elnur ECOSSH single-supply range to minimise rewiring costs. Adding smart thermostats for rooms heated by direct-acting radiators alongside storage heaters can give you a unified heating system managed from one app.
Compatible Tariffs
Economy 7 is the traditional choice and remains widely available. Economy 10 (ten cheap hours spread across day and night) suits homes that need a top-up of heat in the afternoon. Newer EV-focused tariffs — Octopus Go, Octopus Agile, E.ON Next Drive — also provide overnight cheap windows that align with standard storage heater charge times. Check your tariff's off-peak hours with your supplier before installation to confirm alignment. Also see our comparison of best electric radiators UK if you need supplementary heating between storage heater charges.
Grants and Financial Help in 2026
Two government schemes remain relevant for storage heater replacement in 2026:
ECO4 (Energy Company Obligation 4) has been extended to 31 December 2026. Under ECO4, households on qualifying means-tested benefits whose primary heating is old or broken electric storage heaters may be eligible for free replacement heaters, funded by energy suppliers. The home typically needs an EPC rating of E, F, or G. New applications have become more limited as suppliers approach their delivery targets, so apply promptly via a registered installer or energy supplier.
The Warm Homes Plan launched in January 2026 as the long-term successor to ECO4. The £13.2 billion programme runs to 2030 and covers grants for low-income households and low-interest loans for others. Storage heater upgrades may qualify under the Local Authority Delivery (LAD) element; check gov.uk or contact your local council's energy efficiency team for the latest eligibility criteria.
For households not eligible for grants, the payback calculation is straightforward: switching from old manual storage heaters to a smart HHR model typically reduces storage heating electricity consumption by 20–27%, so savings of £100–£200 per year are realistic for an average UK home, paying back the cost of a new heater in three to six years.
Storage Heaters vs Other Electric Heating
Storage heaters make the most sense when you are on — or can switch to — an Economy 7-style tariff, your consumption is high enough that the cheaper night rate offsets the higher day rate, and you need whole-room background warmth rather than instant-response spot heating. For rooms that see unpredictable use, or where instant heat is the priority, infrared heating panels or electric radiators with smart thermostats may be more appropriate — they respond immediately but cost more per kWh on a flat-rate tariff.
