Cheapest tariff for underfloor heating in the UK (how to find it)

Underfloor heating can be cheap to run or surprisingly expensive depending on whether it’s electric or water-based, your meter type, and when you use heat. This guide shows the tariff types that usually work best, how to check your setup, and how to compare safely.

  • Electric underfloor heating often benefits from off-peak tariffs only if you can shift heat to cheaper hours (and you have the right meter)
  • Wet (hydronic) underfloor heating usually comes down to your gas price or your heat pump electricity tariff and flow temperature
  • We’ll show two realistic cost scenarios, common pitfalls (including EV tariffs), and what to ask an installer/landlord
Get your underfloor heating quote How to choose the right tariff

Estimates and eligibility vary by supplier, region, meter type and payment method. Always check standing charges, unit rates, exit fees and any smart meter requirements before switching.

Fast answer: what’s usually the cheapest tariff for underfloor heating?

There isn’t one single “cheapest” tariff for underfloor heating in the UK, because the best deal depends on what type of underfloor heating you have and when you use it. In practice:

Electric underfloor heating

Often cheapest on a time-of-use style tariff (off-peak hours) if you can run it mainly overnight/cheap windows, and your floor can store heat. If it’s used like an on-demand heater during peak times, a simple low unit-rate tariff may work better.

Wet (water-based) UFH with a gas boiler

It behaves like central heating. The “cheapest tariff” is usually the cheapest overall gas unit rate + standing charge for your region and payment method, plus a sensible boiler control setup.

Wet UFH with a heat pump

Underfloor heating can pair well with heat pumps because it runs at lower flow temperatures. Cheapest tends to be a competitive standard electricity tariff or a carefully chosen off-peak tariff (only if the heat pump or thermal store can shift meaningful usage off-peak).

Key takeaway: If your underfloor heating is electric and mostly used evenings, a flashy “cheap night rate” tariff can cost more overall due to a higher day rate and standing charge. If you can genuinely run heat during cheaper hours (or you have a well-insulated slab that holds warmth), off-peak can be beneficial.

What you need to know before comparing
1) Electric vs wet UFH, 2) smart meter or not, 3) whether you can move heating to off-peak hours, 4) single-rate vs multi-rate meter, 5) your approximate annual kWh usage.

Compare tariffs for underfloor heating (whole-of-market)

Tell us your postcode and contact details and we’ll match you with tariffs that fit your meter type and usage pattern. If you’re not sure whether your UFH is electric or wet, you can still submit—our team can help you confirm what matters for the quote.

Tip: If you have electric underfloor heating, it helps to know whether it’s the main heating source or just for bathrooms/kitchens. That changes the tariff recommendation.

Two quick scenarios (with assumptions)

Scenario A: electric UFH used mostly at peak times

Assumptions: 2,000 kWh/year for UFH (e.g., small flat with electric UFH as a key heat source), most use between 4pm–10pm. Standing charge ignored for simplicity; tariff examples show unit rate only.

Estimated UFH running cost:

  • Standard single-rate at 26p/kWh: 2,000 × £0.26 ≈ £520/year
  • Off-peak style (15p night / 35p day) where most UFH is on day rate (say 80% day): (1,600×£0.35)+(400×£0.15)=£560+£60 ≈ £620/year

Why it matters: if you can’t shift usage, a higher day rate can outweigh cheap off-peak hours.

Scenario B: electric UFH with good load shifting

Assumptions: 2,500 kWh/year for UFH, well-insulated floor slab, heating scheduled mainly overnight/cheap windows (say 70% off-peak). Unit rates shown are illustrative.

Estimated UFH running cost:

  • Standard single-rate at 26p/kWh: 2,500 × £0.26 ≈ £650/year
  • Off-peak style (15p off-peak / 35p peak), 70% off-peak: (1,750×£0.15)+(750×£0.35)=£262.50+£262.50 ≈ £525/year

Real-world results depend on your meter, schedule, and the thermal mass of the floor.

Important: The scenarios above are electric UFH energy-only estimates. Your actual bill also includes standing charges and other household usage at different times. We look at your total consumption pattern, not just the heating.

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Renting? You can still switch supplier in many rentals if you pay the bills and your tenancy allows it. If bills are included, ask the landlord/agent what tariff you’re on and whether you can influence heating controls.

Tariff types that can be cheapest for underfloor heating

Think in terms of how your heating draws energy, not the marketing name of the tariff. Below are the common UK tariff types and when they can (and can’t) suit underfloor heating.

1) Single-rate electricity tariffs

One unit price all day. Often the safest baseline if you can’t reliably move usage to cheaper hours.

  • Best for: electric UFH used “as needed” during daytime/evenings; mixed household usage; renters unsure about heating schedule.
  • Watch outs: don’t focus only on unit rate—standing charge can make a “cheap” tariff expensive overall.

2) Economy 7 / multi-rate style tariffs

Cheaper electricity at night, higher in the day. Historically used for storage heaters, but can work for UFH with thermal mass.

  • Best for: electric UFH you can schedule overnight; properties where a large share of usage can be off-peak.
  • Watch outs: not all homes have the right meter; off-peak hours vary by region/meter setup; day rates can be significantly higher.

3) Smart time-of-use (TOU) tariffs

Prices change by time block (sometimes daily). These can reward flexibility, but they’re not “automatically cheap”.

  • Best for: homes with smart meters and strong control over when heating runs; some heat pump setups; homes with batteries (where appropriate).
  • Watch outs: complexity; peak prices can be high; you must understand which hours your UFH actually draws power.

4) EV / “super off-peak” tariffs (even without an EV)

Some have very cheap overnight rates but higher daytime rates and eligibility rules.

  • Best for: households that can move a lot of total electricity use overnight (EV charging, batteries, some thermal storage).
  • Watch outs: may require a compatible smart meter, specific hardware, or proof of EV; can be poor value for daytime-heavy electric UFH.

If your UFH is wet: the “tariff” question usually shifts to (a) your gas tariff if you have a boiler, or (b) your electricity tariff if you have a heat pump. Wet UFH itself doesn’t typically need a special meter—your heat source does the work.

Quick comparison table + decision checklist

Use this to narrow down the tariff type that’s most likely to be cheapest for your underfloor heating in your situation.

Tariff type Typically suits Typically doesn’t suit What to check before switching
Single-rate electricity Electric UFH used on-demand; mixed daily usage Homes that can move lots of use to off-peak Unit rate + standing charge; any exit fees
Economy 7 / multi-rate Electric UFH scheduled overnight; high off-peak share Peak-time UFH use; low off-peak usage Your off-peak hours; meter supports multi-rate; day vs night unit prices; standing charge
Smart TOU Smart meter homes; flexible schedules; some heat pump systems People who want simple bills; unpredictable routines Peak price levels; how prices are set; if you can automate heating controls
Gas tariff (wet UFH + boiler) Wet UFH with gas boiler; consistent heating demand All-electric homes Gas unit rate + standing charge; boiler controls; any fixed-term exit fees

Checklist: what to find out (10 minutes)

  • UFH type: electric mats/cables vs wet pipes (ask installer/landlord if unsure).
  • Meter type: single-rate, Economy 7, smart meter, prepay (key/card).
  • Controls: can you schedule UFH? Does it have a programmable thermostat per room?
  • Usage pattern: when is the home occupied? (Daytime, evenings, weekends.)
  • Heat retention: well-insulated slab vs thin screed/retrofit—does it stay warm?
  • Contract terms: fixed end date, exit fees, price cap or tracker exposure.

Who it suits / who it doesn’t

Likely to benefit from off-peak

  • Electric UFH you can pre-heat overnight
  • Homes with high overnight load (EV/battery/thermal storage)
  • Very predictable routines

Often better on single-rate

  • UFH used mainly evenings
  • People working from home with daytime heat needs
  • Low flexibility / manual control only

Reality check: “Cheapest” is about your total bill (unit rates + standing charges + when you use energy), not just one headline number.

Costs, exclusions and common pitfalls (underfloor heating)

These are the issues we most often see when people try to find the cheapest tariff for UFH. A quick check now can prevent an expensive surprise later.

1) Standing charges can dominate

If your UFH is only used in a small area (e.g., bathroom electric UFH), your usage may be low—so a higher standing charge can wipe out a lower unit rate.

2) Off-peak hours aren’t universal

Economy 7 times can vary and may change with daylight saving or meter configuration. Always confirm the exact off-peak window for your meter.

3) Smart tariffs may require a smart meter

Some time-of-use tariffs are only available with a compatible smart meter and remote readings. If you can’t (or don’t want to) have one, options can be limited.

4) Electric UFH is responsive slowly

Underfloor heating can take longer to warm up than radiators. If you switch to a tariff where cheap hours don’t match when you need warmth, you may end up heating during expensive periods or overheating to compensate.

5) Multi-rate meters can complicate switching

Not every supplier supports every legacy meter setup. If you have Economy 10/complex multi-rate, check compatibility before switching to avoid billing issues.

Heat pump homes: A tariff that’s great for EV charging isn’t automatically great for a heat pump + UFH. Heat pumps can run across the day in cold weather. If the peak rate is high, your winter costs may rise even if you get cheap overnight electricity.

What we mean by “cheapest” (practical definition)

For this guide, “cheapest” means the lowest estimated annual cost for a typical household with underfloor heating, considering unit rates, standing charges, and realistic usage timing. It does not mean the lowest headline unit price in isolation.

Costs this guide does not include

  • Installation/repair costs of UFH systems
  • Building fabric improvements (insulation, draught-proofing)
  • Service plans/boiler cover
  • Changes to your heating controls or electrical work

FAQs: cheapest tariffs for underfloor heating (UK)

Is Economy 7 always cheaper for electric underfloor heating?

No. Economy 7 can be cheaper only if you can move a large share of your UFH (and ideally other household usage) to the off-peak hours. If most heating happens in the day/evening, the higher day rate can make it more expensive overall.

How do I tell if my underfloor heating is electric or wet?

Electric UFH is usually controlled by wall thermostats that switch electric circuits and may have an isolation switch/fused spur nearby. Wet UFH connects to your boiler/heat pump via a manifold (often in a cupboard) with multiple pipe loops and actuators. If renting, ask the landlord/agent for the UFH system type and the heat source.

Do I need a smart meter to get the cheapest underfloor heating tariff?

Not always. Many competitive fixed/variable single-rate tariffs don’t require a smart meter. However, some time-of-use tariffs do require a compatible smart meter because prices depend on half-hourly readings.

I have wet UFH with a gas boiler—do I need a special tariff?

Usually not. Wet UFH with a boiler is mainly about getting a competitive gas tariff (unit rate + standing charge) and ensuring controls are set up properly (flow temperature, zoning, schedules). The UFH pipes don’t need a dedicated electricity tariff in most homes.

Can an EV tariff help if I don’t have an electric vehicle?

Sometimes, but be cautious. Some EV tariffs have eligibility requirements (smart meter, specific charger, or EV ownership). Even if you qualify, they may have high peak rates that can increase costs if your UFH runs during the day/evening.

Is electric underfloor heating cheaper than gas underfloor heating?

It depends on prices and how you use it. Electric UFH is 100% efficient at point of use but electricity costs more per kWh than gas. Wet UFH using a gas boiler may be cheaper per kWh, while wet UFH with a heat pump can be very efficient (depending on system design and outdoor temperatures). The cheapest option depends on your property and heat source—not just the floor system.

Do tariffs differ across the UK?

Yes. Electricity and gas standing charges and unit rates can vary by region (distribution area), and prices also differ by payment method (direct debit vs prepayment) and meter type (single vs multi-rate). That’s why your postcode is essential for an accurate comparison.

Will switching supplier affect my underfloor heating controls?

Switching supplier doesn’t change your UFH hardware. What can change is how beneficial a schedule is (because price windows change). After switching, review thermostat schedules—especially if you move onto off-peak or time-of-use pricing.

Trust, methodology and sources

Editorial accountability

Reviewed by
Energy Specialist
Last updated
April 2026

How we assess “cheapest tariff” for underfloor heating

We assess tariff suitability using a consumer-first approach that reflects how underfloor heating behaves in UK homes:

  • System type: electric UFH (direct electric) vs wet UFH (heat source is boiler/heat pump).
  • Meter constraints: single-rate vs multi-rate; smart meter availability; prepayment limitations.
  • Usage timing: whether heating can be shifted into off-peak windows without harming comfort.
  • Total bill impact: standing charges + unit rates + realistic distribution of kWh across time bands.
  • Tariff terms: fixed vs variable, any exit fees, eligibility requirements (e.g., smart meter/EV/charger), and regional pricing differences.

Limitations: This guide provides general guidance and illustrative examples. Actual prices change, and comfort outcomes depend on insulation, floor construction, control settings, and weather. We recommend comparing using your own recent bills (kWh) where possible.

UK sources we rely on

We also use supplier tariff information and meter industry conventions where relevant; availability varies by region, meter type and payment method.

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Updated on 26 Apr 2026