Best electricity supplier for a heat pump

Installing a heat pump means heating your home with electricity — and watching your consumption climb by several thousand kWh a year. At that level, the choice of supplier is no longer a matter of a few euros: it can weigh 150 to 300 € on your annual bill. Here is how to choose according to your profile, and how it compares with the rest of the market in our ranking of the best electricity suppliers.

Does a heat pump change the ideal supplier?

Yes, because a heat pump shifts the whole weight of the bill onto the kWh price. As long as you use 3,500 kWh a year, a welcome promo or a low standing charge is enough to make the difference. As soon as the pump pushes consumption to 7,000 or 8,000 kWh, it is the price of every kilowatt-hour that dominates — and a supplier ranked well for a small profile can end up mediocre on a large consumption. Concretely, for a household heating with a heat pump, the right reflex is to redo the comparison on your new consumption, not the old one. This is also what sets this profile apart from classic resistive electric heating: the pump uses three to four times less for the same heat, but it also runs during the day, which changes how you optimise off-peak hours.

How many kWh does a heat pump add per year?

An air-to-water heat pump typically adds 3,000 to 6,000 kWh per year, and up to 8,000 kWh if it also produces domestic hot water. Thanks to its coefficient of performance (it delivers 3 to 4 kWh of heat for 1 kWh of electricity), it uses far less than direct resistive heating — but the electricity bill still rises sharply. A Walloon household that ran at 3,500 kWh often moves to 6,500-9,500 kWh once the pump is in service. On the mid-2026 tariff grids we track, with a kWh between 0.16 and 0.20 €, that means several hundred euros more per year. Above all: on 8,000 kWh, a gap of just 3 to 4 cents per kWh between two suppliers translates into 240 to 320 € of annual difference. In other words, the kWh price weighs far more than any welcome gift.

Fixed, variable or dynamic tariff: which for a heat pump?

For a heat pump, the most profitable contract depends mainly on your ability to shift the heating in time. A fixed tariff locks in the price and reassures on budget, but you pay more per kWh — a real handicap when you consume a lot. A variable tariff is generally cheaper and suits most systems that run without fine control. The dynamic tariff, meanwhile, follows the wholesale price hour by hour: it becomes very attractive if your pump can be controlled (buffer tank, smart thermostat, battery or solar panels), because you schedule the heating during the cheapest hours, sometimes at negative prices. According to VREG estimates, a flexible household can save several dozen to nearly 190 € per year. Be careful, though: the CREG points out that dynamic pricing remains marginal (around 0.4 % of the Belgian residential market) and that a non-flexible household risks overspending by about 15 %. Bolt, Mega, Engie, Luminus and TotalEnergies all offer a dynamic formula — we cover that choice in our guide to the best dynamic-tariff supplier.

Do the new 11am-5pm off-peak hours help your heat pump?

Yes, especially in Wallonia, where the dual-hour meter reform changes things for a heat pump. Since 1 January 2026, Walloon off-peak hours cover 11am-5pm and 10pm-7am, every day, i.e. about 105 hours a week. This new midday slot is a boon for a heat pump: it can pre-heat the house or the hot-water tank in the middle of the day at the reduced rate — and it is even more profitable if you have solar panels producing at the same time. In Brussels, off-peak remains 10pm-7am plus the weekend. Wallonia also offers an incentive network tariff, ORES's "Impact" tariff, designed for households with large programmable consumption such as heat pumps, electric cars or boilers: it rewards off-peak consumption. Test-Achats confirms that these profiles are the big winners of incentive pricing — provided you actually control the appliances. The right reflex: a dual-hour meter and a thermostat that shifts the heating towards off-peak slots.

Which suppliers are best placed for a heat pump?

The most interesting suppliers combine a low kWh price with an off-peak or dynamic offer. We cross-checked the mid-2026 tariff grids against the needs of a "heat pump" profile: here is how the main Belgian players line up.

In practice, a household that simply wants to pay the least without complicating its life will look first at Mega, often unbeatable on the kWh. A home with solar panels or a battery, willing to control its pump, will get more out of a dynamic tariff with Bolt or Luminus. Engie and TotalEnergies remain solid choices for those who value size and the range of services, while accepting a slightly higher kWh.

Which supplier should you choose for your heat pump?

The right supplier depends on your system and your appetite for control. For a "classic" heat pump that runs without automation, aim for the lowest kWh price and a dual-hour meter: Mega, or Bolt, tick the box for most households. If your pump is paired with solar panels, a battery or a smart thermostat, a dynamic tariff with Bolt or Luminus can melt the bill by capturing off-peak hours and low midday prices. If you prefer the peace of mind of a big group with branches and a phone service, Engie or TotalEnergies hold up, provided you accept a slightly less aggressive tariff. In every case, redo the comparison on your new consumption — not the old one — and check your exact situation on the official comparison tool of the CREG, VREG or CWaPE. We update these simulations every quarter, because the grids move fast.

In short, with a heat pump, everything hinges on the kWh price and your ability to shift the heating towards off-peak hours. Compare the whole market and its up-to-date ranking in our ranking of the best electricity suppliers, then sign the contract tailored to your consumption profile.