Cheapest electricity tariff for wet electric heating (UK)
Find tariffs that can work well with wet electric heating (electric boiler, heat batteries/thermal store, or an immersion-fed wet system). We’ll explain what “cheapest” really means for your meter and usage pattern, and help you compare accurately.
- Best results usually come from matching your heating schedule to off‑peak hours (if you’re eligible)
- We cover Economy 7, smart time‑of‑use, and single‑rate options (with pitfalls to avoid)
- Includes example costs, a decision checklist, and a quick quote form
Estimates only. Availability and prices vary by postcode, meter type, payment method, and supplier terms (including standing charges and exit fees).
Fast answer: what’s usually cheapest for wet electric heating?
There isn’t one universally “cheapest” tariff for wet electric heating. The lowest annual cost is typically achieved by matching your heating load to the cheapest hours your meter and supplier allow:
If you have Economy 7 (two-rate)
Often works well if you can move a big share of heating and hot water into off‑peak hours (commonly around 7 hours overnight, timings vary by region/meter).
If you have a smart meter
A time‑of‑use tariff can be competitive only if your heating controls can reliably avoid peak hours. Peak rates can be much higher.
If you can’t shift usage
A single‑rate tariff may be cheaper overall, because you’re not paying a higher day rate (and sometimes higher standing charge) for off‑peak you can’t use.
Important: Wet electric heating can mean several set‑ups (electric boiler feeding radiators, thermal store/heat battery, immersion heating a cylinder feeding heating/hot water). The “cheapest tariff” depends on (1) your meter, (2) your heating schedule, and (3) your day vs night split. We show how to estimate this reliably below.
- Key takeaway #1
- For most homes with wet electric heating, the cheapest tariff is the one that minimises the cost of your highest‑kWh hours (usually winter mornings/evenings).
- Key takeaway #2
- Don’t judge on unit rates alone: standing charge, payment method, and exit fees can change the winner.
- Key takeaway #3
- If you’re on a multi‑rate meter (Economy 7/10), switching to single‑rate may require a meter change and isn’t always quick or free.
Compare tariffs that fit wet electric heating
Tell us the basics and we’ll match you with electricity tariffs available for your postcode and meter type. We’ll also highlight options that may suit high electric heating demand (including off‑peak tariffs where available).
What to have to hand (30 seconds)
- Your postcode and whether you pay by Direct Debit or another method
- Your meter type: smart, single-rate, Economy 7 (two-rate), or unsure
- Rough heating pattern: mostly daytime, mostly overnight, or mixed
Tip for wet electric heating: If your electric boiler or thermal store can be scheduled, note the typical hours it runs. A tariff that’s brilliant for EV charging isn’t automatically best for space heating if your home needs heat during peak windows.
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Compare the main tariff types for wet electric heating
Wet electric heating typically uses a lot of electricity in winter. That makes the shape of your usage (when you use power) just as important as the unit rate. Use this table to narrow down what to compare.
| Tariff type | What it is | When it can be cheapest | Watch-outs |
|---|---|---|---|
| Single-rate | One unit rate all day, plus standing charge. | If your electric boiler runs mostly daytime/evenings or you can’t reliably shift load. | Can look “middle of the road” but still win once standing charges are included. |
| Economy 7 (two-rate) | Cheaper night rate for ~7 hours (varies by meter/region), higher day rate. | If you can push a meaningful share of heating/hot water to off‑peak (thermal store, immersion scheduling, some electric boilers). | If you use lots of power in the day, the higher day rate can outweigh off‑peak savings. Off‑peak times are not identical everywhere. |
| Time-of-use (smart) | Multiple price periods (cheap/standard/peak) that can vary by time/day. | If you can avoid peak windows and pre-heat/store heat cheaply (and you’re comfortable with variable pricing). | Peak rates can be high; poor scheduling can cost more. Some tariffs change rates over time; read the T&Cs. |
| Prepayment (PAYG) | Pay as you go, sometimes with smart PAYG. | Occasionally competitive, but more often chosen for budgeting/control. | Not all deals available. If you can switch to Direct Debit, you may access broader options (eligibility varies). |
Decision checklist: who it suits (and who it doesn’t)
- Economy 7 can suit you if you can shift roughly 35–50%+ of your kWh into off‑peak (common with thermal stores, heat batteries, or controlled immersion heating).
- Single-rate can suit you if most heating is required during the day/evenings (e.g., occupied home, poor thermal retention, limited controls).
- Time-of-use can suit you if you have a smart meter and automation/scheduling that avoids peaks without compromising comfort.
- It may not suit you to move to off‑peak if your home struggles to hold heat, or your system can’t store enough heat/hot water.
Two quick, realistic examples (with numbers)
These are illustrations to show how the maths works. Rates are example figures only (your rates depend on region, supplier and date).
Scenario A (shiftable load): Flat with electric boiler + cylinder. Annual use 8,000 kWh. Off‑peak share 45% (3,600 kWh). Example rates: Economy 7 day 30p/kWh, night 14p/kWh, standing charge 55p/day.
Estimated annual energy: (4,400×£0.30) + (3,600×£0.14) = £1,320 + £504 = £1,824. Standing charge: 365×£0.55 ≈ £201. Total ≈ £2,025/year.
Scenario B (mostly day use): House with wet electric radiators/boiler. Annual use 10,500 kWh. Off‑peak share 20% (2,100 kWh). Same example Economy 7 rates as above. Single-rate alternative: 26p/kWh, standing charge 50p/day.
Economy 7 estimate: (8,400×£0.30) + (2,100×£0.14) = £2,520 + £294 = £2,814; + standing ≈ £201 ⇒ £3,015/year.
Single-rate estimate: 10,500×£0.26 = £2,730; + standing 365×£0.50 ≈ £183 ⇒ £2,913/year. In this pattern, single-rate can be cheaper.
Why it matters: Economy 7 only tends to win when you can move enough kWh into the cheaper window. Small changes in day/night split can flip the result.
Costs, exclusions and common pitfalls (wet electric heating)
These are the issues that most often cause people to pick a tariff that looks cheap on paper but costs more in practice.
1) Standing charge differences
A tariff with a low unit rate can still be expensive if the standing charge is higher. This can matter less for high-use heating homes, but it can still change the winner across suppliers.
2) Off-peak hours aren’t universal
Economy 7 “night” hours vary by region and meter configuration (and can shift with BST/GMT). Always confirm your meter’s switching times before changing heating schedules.
3) Exit fees and fixed terms
Some fixed deals include exit fees. If you’re likely to move home or change meter type, factor this in. Variable tariffs usually have no exit fees, but prices can change.
4) Meter compatibility and upgrade delays
Moving between single-rate, Economy 7 and some smart time‑of‑use tariffs may require a meter exchange or configuration change. Timescales and any charges vary by supplier and local circumstances.
5) Heating control limitations
If your wet electric system can’t store heat (or your home loses heat quickly), forcing more heating into off‑peak hours may reduce comfort and increase daytime top‑ups at high rates.
6) Payment method and credit checks
The cheapest deals are often for monthly Direct Debit. If you’re on prepay or prefer on‑receipt billing, your options may differ. Eligibility is supplier-specific.
Quick self-check: If you don’t know whether you’re single-rate or Economy 7, look at your bill for two unit rates (often labelled “day” and “night”) or two registers on the meter. If unsure, use the quote form and select Not sure—we’ll guide you.
FAQs: cheapest electricity tariff for wet electric heating
Is Economy 7 always cheapest for electric boilers feeding radiators?
No. Economy 7 can be cheaper only if you can use enough off‑peak electricity for heating/hot water. If your heating demand is mainly mornings/evenings, a higher day rate can outweigh the night savings.
What counts as “wet electric heating” in this guide?
We mean electric-powered heat distributed via a wet system: electric boiler to radiators/UFH, immersion-heated cylinder/thermal store feeding heating/hot water, or heat battery systems. If you have a heat pump, your tariff considerations are similar (high kWh), but your run patterns can differ.
Do I need a smart meter for time-of-use tariffs?
Usually, yes. Most time‑of‑use tariffs require a functioning smart meter to measure usage by half-hour (or similar). Availability varies by supplier and region, and the tariff’s peak periods matter a lot for heating homes.
Can I switch from Economy 7 to single-rate (or vice versa)?
Often yes, but you may need a meter exchange or reconfiguration. That can take time and may depend on your supplier and meter set-up. Ask about any charges, appointment lead times and whether your new tariff depends on the meter type.
How do I estimate my day vs night split?
If you already have Economy 7, your bill often shows day and night kWh. If you’re on a smart meter, some apps/exported data show time-of-day usage. If you’re unsure, a practical start is to estimate the hours your electric boiler/immersion runs overnight vs daytime and refine after you see a couple of winter bills.
Will a cheap EV tariff be best for my wet electric heating?
Not necessarily. Some EV-focused tariffs have very cheap off‑peak hours but higher peak rates. If your home needs heating during peak windows, the overall cost can rise. The best approach is to compare based on your heating schedule and total annual kWh, not the headline off‑peak price.
I’m on a prepayment meter—can I still get a competitive tariff?
Sometimes. Options can be more limited, and prices vary. If you want to move to Direct Debit, that’s supplier-specific and may involve checks. If you’re struggling with costs, you can also review support options and advice via Citizens Advice.
What’s the biggest mistake people make with wet electric heating tariffs?
Choosing a tariff based on a single unit rate (usually the off‑peak rate) without checking (a) standing charge, (b) the actual off‑peak hours, and (c) whether their heating system can genuinely shift load without triggering expensive daytime top-ups.
Trust, methodology and sources
Page governance
- Written by
- EnergyPlus Editorial Team
- Reviewed by
- Energy Specialist
- Last updated
- April 2026
How we assess “cheapest” (and the limitations)
We define “cheapest” as the lowest estimated annual electricity cost for a household, considering:
- Unit rates (single-rate or multi-rate)
- Standing charge (per day)
- Eligibility (meter type, smart meter requirement, payment method)
- Likely usage pattern for wet electric heating (day vs off‑peak split)
Limitations: tariffs and rates can change, and off‑peak hours may differ by region and meter set-up. The example scenarios on this page use illustrative rates to demonstrate the calculation method and are not a quote. Your actual costs depend on your supplier, tariff terms, and how your heating system is controlled.
Editorial transparency: EnergyPlus is a whole-of-market comparison service for UK homes. When you request a quote, we use your details (like postcode and meter type) to check availability and provide tariff options. Always read the tariff’s Key Facts / terms before switching.
UK sources we reference
- Ofgem (UK energy regulator) – regulation, consumer rights and market rules
- Citizens Advice: energy guidance – practical advice on bills, meters and switching
- GOV.UK – official government guidance (including cost support schemes when available)
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