Best energy tariff for electric radiators in the UK
Electric radiators can be expensive to run — but the “best” tariff depends on your meter type, when you heat your home, and whether you can shift usage off‑peak. This guide explains what to choose, why, and how to compare UK tariffs confidently.
- Find out if a single‑rate, Economy 7/10, or smart time‑of‑use tariff fits your heating pattern
- See realistic running-cost scenarios with worked numbers (and the assumptions behind them)
- Use our checklist to avoid common pitfalls like the wrong meter, peak-heavy heating, or exit fees
Estimates use typical UK tariff structures and example prices. Your actual costs depend on your meter, region, home, and supplier terms.
Fast answer: the best tariff depends on when you heat
For most homes using electric radiators as their main heating, the best tariff is usually one that matches your heating pattern:
Single‑rate tariff
Often best if you heat mostly evenings/weekends and can’t shift much usage overnight. Simpler billing, no off‑peak window to manage.
Economy 7 / Economy 10
Can suit homes that can run electric heating (or storage heaters/hot water) significantly off‑peak. Day rate is usually higher, so daytime heating can cost more.
Smart time‑of‑use (TOU)
Best for flexible households with a smart meter who can target cheaper periods. Great potential, but prices can vary by time/day and need active management.
Important: Many “off‑peak” tariffs only work well if a meaningful share of your heating load runs in the cheaper window. If your electric radiators are used mainly during peak times, a single‑rate tariff may be cheaper overall even if the unit rate looks higher than an off‑peak rate.
Key takeaways (UK‑specific)
- Meter type matters: Economy 7/10 and many TOU tariffs require the right meter setup (often a smart meter or a multi‑rate meter).
- Region and payment method change prices: standing charges and unit rates vary by region and whether you pay by Direct Debit or prepayment.
- Electric radiator “efficiency” doesn’t change unit cost: most resistive electric heaters are near 100% efficient at point of use, so your tariff and usage hours drive cost.
- Check exit fees and fixed term end dates if you’re leaving a fixed tariff.
Compare tariffs built around electric heating
If you use electric radiators, the “best” deal is rarely just the lowest headline unit rate. We compare whole‑of‑market options (where available), factoring in:
- Meter type: single rate, Economy 7/10, smart TOU
- Where you live: regional price differences
- Payment method: Direct Debit vs prepayment
- Tariff features: fixed vs variable, exit fees, off‑peak windows
Quick self-check: If your radiators run mainly 7am–10pm, you’ll often want a competitive single‑rate. If you can run lots of heating/hot water overnight (or have storage heaters), Economy 7/10 or TOU may be worth testing.
How tariff choice interacts with electric radiators
Panel heaters / convectors
These deliver heat when switched on, so usage tends to be peak-time. Unless you can schedule heat into cheaper windows, a strong single-rate can be the safest bet.
High heat retention / programmable radiators
If you can charge heat overnight (or heavily bias heating to off‑peak), multi‑rate tariffs can work better — but only if you actually use that cheaper period.
Get a personalised quote
Tell us a few details and we’ll show options that match your meter and usage pattern. No guarantees — just transparent comparisons.
Tenant? You can usually switch supplier if you pay the bills, but your landlord may control the meter type/heating system. If you’re on prepayment, availability can be more limited.
Tariff comparison for electric radiator homes
Use this as a practical guide. Exact prices, off‑peak windows, and eligibility vary by supplier, region and meter.
| Tariff type | Best when… | Watch-outs | What to check before switching |
|---|---|---|---|
| Single-rate (standard) | Your heating is mainly evenings and you can’t reliably shift demand overnight. | Can look “more expensive” on unit rate alone; standing charge matters. | Exit fees on current fix; payment method; your annual kWh estimate. |
| Economy 7 | You can put a large share of heating/hot water into the ~7-hour off‑peak window. | Day rate often higher; off‑peak hours vary by area and meter setup. | Confirm your meter is Economy 7; confirm off‑peak times; check if radiators can be scheduled. |
| Economy 10 | You get off‑peak split across day/night (helpful for daytime warmth with storage/retention setups). | Not available everywhere; supplier choice can be narrower. | Your current meter type; tariff availability for your postcode; heating controls compatibility. |
| Smart time-of-use (TOU) | You have a smart meter and can actively move heating to cheaper slots. | Peak prices can be high; rates can change by time/day; not ideal for inflexible heating needs. | Smart meter status; tariff rules; whether rates are fixed/variable; how you’ll avoid peak. |
Decision checklist: who it suits (and who it doesn’t)
A multi‑rate/off‑peak tariff may suit you if…
- You can run at least ~35–45% of usage off‑peak (typical break-even range; depends on prices).
- You have storage heaters or high heat retention radiators you can charge overnight.
- You can shift hot water heating (immersion) to off‑peak via a timer.
- You’re comfortable tracking off‑peak hours (they can differ by meter/region).
You may be better with a single‑rate tariff if…
- Your heating is mainly peak-time (mornings/evenings) and you can’t shift it.
- You work from home and need daytime heat (unless you have Economy 10 or flexible TOU).
- You’ve got an Economy 7 meter but most usage is on the day rate.
- You want simple bills and predictable costs.
Costs, exclusions, and common pitfalls (electric radiators)
Electric radiator running costs depend on (1) how many kWh you use, (2) your unit rates at the time you use electricity, and (3) your standing charge. Below are the most common gotchas we see in the UK.
Pitfall 1: Economy 7 without enough off‑peak use
Economy 7 can be great for storage heating, but if your electric radiators run mostly during the day/evening, you may pay a higher day rate for most of your consumption.
Pitfall 2: Not knowing your off‑peak hours
Off‑peak hours aren’t always the same everywhere and can be set by the meter configuration. Always confirm the times before you rely on overnight heating or timers.
Pitfall 3: Comparing unit rates but ignoring standing charge
If you use less electricity (for example, a well‑insulated flat), standing charge can make a big difference. A slightly higher unit rate with a lower standing charge can still win overall.
Pitfall 4: Assuming “smart” automatically means cheaper
Time‑of‑use tariffs can punish peak-time use. If your heating can’t move away from peak periods, a simple single‑rate may be more predictable and sometimes cheaper.
Eligibility note: Some tariffs are only available with Direct Debit, or require a smart meter operating in smart mode. If your meter isn’t compatible, you may be offered a different tariff or need a meter change first.
Two realistic cost scenarios (with assumptions)
These are illustrative examples to show how electric radiators interact with tariff structure. They are not quotes. Prices vary by region and supplier.
Scenario A: Evening-heavy heating (panel radiators)
- Home/use pattern
- 1–2 bed flat, electric radiators mostly 5pm–11pm; limited overnight load shifting.
- Annual electricity use (assumed)
- 4,200 kWh/year (space heating is a large share).
- Example tariff A (single rate)
- Unit rate 27p/kWh; standing charge 55p/day.
Estimated annual cost: (4,200 × £0.27) + (365 × £0.55) = £1,134 + £200.75 = £1,334.75
Why this matters: if most heating is at peak times, a flat single rate can avoid a costly “day rate” premium found on some multi‑rate tariffs.
Scenario B: High off‑peak share (retention heaters + timer)
- Home/use pattern
- 2–3 bed home; uses programmable/retention heating and heats water overnight.
- Annual electricity use (assumed)
- 7,800 kWh/year.
- Off‑peak share (assumed)
- 45% off‑peak (3,510 kWh) and 55% day rate (4,290 kWh).
- Example tariff B (Economy 7)
- Day 30p/kWh; night 14p/kWh; standing charge 55p/day.
Estimated annual cost: (4,290 × £0.30) + (3,510 × £0.14) + (365 × £0.55) = £1,287 + £491.40 + £200.75 = £1,979.15
Sensitivity check: if off‑peak share fell to 25% (not 45%), this structure would usually perform much worse — because more usage moves onto the higher day rate.
How to use these examples: Ask yourself what % of your electricity could genuinely be off‑peak. If you don’t know, start by checking your bills (day vs night readings) or your smart meter app (half-hourly data if enabled).
FAQs: electric radiators and UK energy tariffs
Are electric radiators cheaper on Economy 7?
Only if you can run a meaningful share of your heating (and often hot water) during the off‑peak window. If your radiators run mainly daytime/evenings, Economy 7’s higher day rate can make bills higher overall.
Do I need a special meter for Economy 7 or Economy 10?
Typically yes — you need a multi‑rate meter setup (many smart meters can support multi‑rate tariffs, but not always). Your supplier can confirm your meter type and whether a meter change is required.
What if I have electric radiators but no storage heaters?
Panel heaters and standard electric radiators produce heat on demand, which tends to be peak-heavy. Unless you can schedule heating into cheaper periods (or have high heat retention units), a competitive single‑rate tariff is often the simplest starting point.
Can I switch tariff if I’m a tenant?
Usually yes if you’re the bill payer, but you must keep the same meter type unless your landlord agrees to changes. If you’re on prepayment, tariff choice may be more limited and you may need to pass affordability/credit checks for some Direct Debit deals.
Is a fixed tariff better than a variable tariff for electric heating?
Fixed tariffs can provide price certainty for the term, which can be helpful with electric heating. Variable tariffs can change (for example, with a supplier’s pricing). Always check the tariff end date, any exit fees, and whether prices are truly fixed or only “capped”.
What does “standing charge” mean and why does it matter?
It’s a daily charge that covers costs like network maintenance and metering. If you have lower usage (or heat lightly), standing charge can be a significant portion of your bill, so it’s important when comparing tariffs.
How do I estimate the running cost of my electric radiators?
A simple estimate is: Heater power (kW) × hours used × unit rate. Example: a 1.5kW radiator used for 4 hours at 27p/kWh costs 1.5 × 4 × £0.27 = £1.62. This excludes standing charge and any off‑peak variations.
Will switching supplier affect my electric radiators?
Switching supplier doesn’t change the heaters themselves. What changes is the price you pay per kWh (and standing charge) and, for multi‑rate tariffs, the cost at different times. If your heating relies on off‑peak times, confirm the new tariff’s off‑peak window.
Trust, methodology, and sources
Page ownership
- Written by: EnergyPlus Editorial Team
- Reviewed by: Energy Specialist
- Last updated: May 2026
How we assess “best tariff” for electric radiators
We focus on what changes total annual cost for electric‑heated homes and what commonly causes households to pick the wrong tariff.
- We compare structures: single‑rate vs Economy 7/10 vs smart TOU, because electric radiator demand is time-sensitive.
- We weight usability: off‑peak tariffs only score well if they’re realistic for typical routines (sleep/work patterns, thermostat settings, timer control).
- We include UK constraints: regional pricing, meter compatibility, payment method differences, fixed term conditions and exit fees.
- We avoid assumptions of savings: we use “estimated” examples and show break-even logic rather than promising outcomes.
Limitations: We can’t know your exact insulation levels, radiator controls, occupancy schedule, or supplier‑specific off‑peak windows from a guide alone. Always confirm tariff details (rates, standing charge, term, exit fees, eligibility) before switching.
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