How Batteries Can Lower Your Heat Pump Costs This Winter

Switching to a heat pump is one of the most efficient ways to heat your home – but pairing it with battery storage can take your savings to the next level.

Last winter, one of our customers cut their electricity bill by more than 50% simply by combining their heat pump with a home battery and an off-peak electricity tariff. Here’s how you can do the same this winter.

The Challenge: Winter Running Costs

Heat pumps are very efficient, but when the temperature drops, they work harder and naturally use more electricity. This can lead to higher bills – especially if you’re on a standard single-rate tariff, where every unit of electricity costs the same no matter when you use it.

The Solution: Load Shifting with a Battery

By pairing a battery with your heat pump, you can “load shift” – storing cheap electricity overnight on a time-of-use tariff (like Octopus Go or Intelligent Octopus) and using it to run your heating system during the day.

In our case study:

• 1,187 kWh of electricity was used in December to heat the home.
• At the standard tariff rate, this would have cost around £308.
• By charging their battery overnight at ≈8p/kWh, the customer reduced their heating cost to £114.88 for the entire month.

That’s a saving of more than 60% – without changing the heat pump settings or sacrificing comfort.

The Best Battery Options for Heat Pump Owners

Different homes need different battery solutions. At GreenGenUK, we offer a range of options to suit property size, budget, and energy goals:

🔋 Fox ESS EP5 & EP11

• Modular and expandable – start small and add more capacity over time.
• Competitive price point and great for single-phase properties.
• Built-in inverter options for simple, tidy installations.

🔋 Sigenergy SigenStor

• Stackable 5, 6 & 10kWh modules with very high output power – great for homes with high heat pump demand.
• Single-phase and 3-phase options available.
• Whole-home backup capability and slick, all-in-one design.

🔋 Tesla Powerwall 3

• The industry’s most recognisable battery with premium build quality.
• High capacity in a single unit and seamless integration with solar PV.
• Powerful backup capability – keep your home running during a power cut.

The Bigger Picture

Pairing a heat pump with a battery doesn’t just save money – it helps balance the grid by using more renewable energy at night when demand is lower.

You don’t need solar panels to take advantage of this approach.
By charging your battery overnight on a cheaper time-of-use tariff, you can still achieve significant savings on your heating costs.

It’s a win for your wallet and for the planet.

Thinking About Batteries for Your Heat Pump?

If you already have a heat pump and want to reduce your bills this winter, adding a battery could be the perfect next step.

📞 Call us on 01326 564513 or
📧 Email [email protected] to speak to our team about battery options.