Heat Pump Electricity Tariffs UK 2026: Which Is the Cheapest for Running Your Heat Pump?

The cheapest heat pump electricity tariff in the UK in 2026 depends on your usage pattern, but for most homeowners a time-of-use tariff like Octopus Cosy or Intelligent Octopus Go will beat a standard variable rate by £300 to £450 a year. On a flat-rate standard tariff at around 24.5p/kWh, a typical 3-bed semi running an air source heat pump costs roughly £850 to £1,050 annually in electricity. Switch to a tariff that gives you 7p to 10p/kWh during off-peak hours and schedule your heating to run mostly overnight, and that drops to £550 to £700.

Why Your Electricity Tariff Matters as Much as Your Heat Pump

Most people spend weeks researching which heat pump brand to buy. They compare COPs, noise levels, warranty lengths. But here's the thing: your choice of electricity tariff can save or cost you more per year than the difference between a good heat pump and a great one.

A heat pump with a seasonal COP of 3.2 running on a 24.5p/kWh flat tariff costs about 7.7p per kWh of heat delivered. That same pump on a 7p/kWh overnight rate costs just 2.2p per kWh of heat. That's cheaper than gas, by a comfortable margin.

Frankly, it's the single biggest variable in your running costs that you can change after installation day.

Every Major Heat Pump Electricity Tariff Available in 2026

Here's a breakdown of the tariffs worth looking at right now. Prices are based on rates published by suppliers as of summer 2026 and can vary by region.

Standard Variable Tariff (SVT)

This is what you're on if you haven't actively switched. Under the Ofgem price cap for Q3 2026, the electricity unit rate sits at around 24.5p/kWh with a daily standing charge of roughly 61p. For a heat pump using 3,500 to 4,200 kWh per year, that means annual heating electricity costs of £860 to £1,030. It works, but you're leaving money on the table.

Economy 7 / Economy 10

These legacy tariffs give you cheaper electricity for 7 or 10 hours overnight, typically between midnight and 7am. Off-peak rates tend to sit around 10p to 13p/kWh, but the daytime rate is higher than standard, often 28p to 30p/kWh. If you can shift 60% or more of your heat pump's work into those overnight hours using a buffer tank or thermal store, Economy 7 can save you roughly £150 to £250 a year compared to SVT. But if your home is poorly insulated and needs a lot of daytime top-up heating, you could actually end up paying more.

Octopus Cosy Octopus

Designed specifically for heat pump owners, Cosy Octopus gives you three cheap heating periods per day: a long overnight window and two shorter slots in the morning and late afternoon. Off-peak rates have been running at 10p to 12p/kWh, with a peak rate of around 40p/kWh for a few hours in the evening. The key is that the cheap windows line up well with typical heating demand patterns. For a well-insulated home with a decent buffer tank, annual heating costs can come in around £600 to £750. You do need a smart meter and a compatible heat pump.

Intelligent Octopus Go

Originally aimed at EV owners, this tariff gives you a flat 7.5p/kWh rate from 11:30pm to 5:30am. If you also have an EV, this is a brilliant double win. The daytime rate is around 24.5p/kWh. The overnight window is shorter than Economy 7, so you need good thermal storage to make it work for heating. Annual heat pump costs on this tariff typically land between £600 and £800, depending on how much demand you can shift.

Octopus Agile

Agile gives you a different unit price for every half hour of the day, based on wholesale market rates. Prices can drop below zero in the early hours and spike above 50p/kWh during the 4pm to 7pm peak. This tariff rewards homeowners who are willing to automate their heat pump around price signals. With a smart controller or home assistant integration, some users report annual heating costs as low as £450. But if you don't automate, or if you run the heat pump on a fixed schedule regardless of price, you could get stung.

OVO Heat Pump Plus

OVO's heat pump tariff offers a discounted unit rate for verified heat pump electricity usage. The exact rate varies, but it's typically been sitting around 15p to 17p/kWh. It's simpler than a time-of-use tariff because you don't need to shift demand, and it works on a single meter. Annual costs come in around £750 to £900. Not the cheapest option, but decent if you want a set-and-forget approach.

EDF Heat Pump Tariff

EDF offers a dedicated heat pump rate through a secondary meter or smart meter separation. Rates have been around 14p to 16p/kWh for the heat pump supply. The setup is straightforward if you already have an EDF account. Expect annual costs of £700 to £850 for a typical installation.

Real-World Example: What a Family in Bristol Actually Pays

Let's look at the Atkins family in a 1930s 3-bed semi in Bristol. They had an 8.5kW Vaillant Aroetherm installed in late 2025 and spent their first few months on a standard variable tariff. Their heating electricity bill for the first full quarter was £310.

In spring 2026 they switched to Octopus Cosy. They already had a 170-litre buffer tank fitted during installation. Their next quarter's bill dropped to £185, even though the weather was similar. Over a full year, they're projecting annual heating costs of about £640, down from an estimated £980 on SVT. That's a saving of £340 per year, just from switching tariff. The switch took about ten minutes online.

How the £7,500 BUS Grant Changes the Maths on Total Cost of Ownership

The Boiler Upgrade Scheme grant in 2026 provides £7,500 towards the cost of an air source heat pump installation. For a typical installation costing £10,000 to £13,000, you're looking at an out-of-pocket cost of £2,500 to £5,500 after the grant.

Now combine that with the right tariff. If you're paying £640 a year in heating electricity instead of £1,100 on gas (the current average for a gas boiler in a similar property), you're saving around £460 a year on fuel. At that rate, the out-of-pocket cost pays for itself in 5 to 12 years, depending on your specific installation cost.

But here's where tariff choice really matters to the payback calculation. On a standard variable electricity tariff at £980 a year, a heat pump barely breaks even against gas on running costs alone. On Octopus Cosy at £640 a year, you're clearly ahead. The grant gets you through the door. The tariff determines whether you stay happy about your decision for the next 15 years.

The BUS grant is available through March 2028. Your installer applies on your behalf as part of the process, and they need to be MCS certified for the application to go through.

"Will I Need a New Meter or Extra Equipment to Get a Cheaper Tariff?"

This is the most common concern we hear, and it's a fair one. The short answer: you'll need a smart meter for most of the best tariffs. If you don't already have one, your energy supplier will install one for free. Most installations take under an hour.

For Economy 7, you may already be on the right meter if your home previously had storage heaters. For tariffs like Octopus Cosy or Agile, a SMETS2 smart meter is required. Some tariffs also work better with a buffer tank or thermal store, which your installer should discuss with you during the heat pump installation.

You won't need a separate electricity supply or a second meter for most of these tariffs. The old approach of having a dedicated heat pump meter is largely being replaced by smart meter time-of-use tracking. If your installer recommends a buffer tank and your quote doesn't include one, ask why. For time-of-use tariffs, it's close to essential.

How to Pick the Right Tariff for Your Home

Start by asking yourself two questions. Can you shift most of your heating to run overnight? And are you comfortable with a bit of automation, or do you want something simple?

If you've got a well-insulated home, a buffer tank, and you're happy to set up schedules, go for Octopus Cosy or Intelligent Octopus Go. If you want to tinker and automate with smart home kit, Agile can save the most money but it's not for everyone.

If you'd rather not think about it, OVO's Heat Pump Plus or EDF's heat pump tariff offer a decent discount without needing to change your habits. You won't save quite as much, but there's something to be said for simplicity.

And if you're still on your supplier's standard variable tariff with a heat pump, please switch. You're overpaying by hundreds of pounds a year and there's no good reason for it.

Frequently Asked Questions

What is the cheapest electricity tariff for a heat pump in 2026?

For most homeowners, Octopus Cosy or Intelligent Octopus Go offer the lowest annual running costs, typically £600 to £750 per year for a 3-bed home. Octopus Agile can be even cheaper if you automate around half-hourly pricing, but it requires more effort and smart home setup.

Can I use Economy 7 with a heat pump?

Yes, Economy 7 works with a heat pump, especially if you have a buffer tank to store heat generated during the cheap overnight hours. You can save £150 to £250 a year versus a flat-rate tariff, but watch out for the higher daytime rate if your home needs a lot of heating during the day.

Do I need a smart meter for a heat pump tariff?

Most of the best heat pump tariffs in 2026 require a SMETS2 smart meter. Your energy supplier will install one for free if you don't have one. The process is straightforward and usually takes less than an hour.

How much does it cost to run a heat pump on electricity per year UK?

On a standard variable tariff, expect to pay £850 to £1,050 per year for a typical 3-bed home. On a time-of-use tariff like Octopus Cosy, that drops to around £600 to £750. The exact figure depends on your home's insulation, the heat pump's efficiency, and how much heating you use.

Is Octopus Cosy worth it for heat pump owners?

Octopus Cosy is one of the best tariffs available for heat pump owners in 2026. It provides three cheap-rate periods per day that align with typical heating demand, and users regularly report saving £250 to £400 a year compared to a standard tariff. You'll get the most benefit if you have a buffer tank installed.

If you're ready to get a heat pump installed, or you want to check what an installation would cost for your home, use our directory at heatpumpinstallerdirectory.co.uk to find a local MCS certified installer. They'll be able to advise on the right system size, whether you need a buffer tank for time-of-use tariffs, and handle the £7,500 BUS grant application on your behalf.