Battery Storage for Heat Pumps
Fox ESS Home Battery Storage
Alto Energy supplies Fox ESS battery storage systems to heat pump installers and homeowners across the UK. If you've installed a heat pump or are considering one, battery storage transforms how you use it. By storing electricity during cheap off-peak windows on tariffs like Octopus Cosy, your battery lets your heat pump run on genuinely affordable energy. Fox ESS systems are fully integrated with an inverter and designed for straightforward installation alongside any heat pump setup.
We supply the complete Fox ESS EVO and PowerQ range, with expert guidance on system sizing, and installation support to ensure your battery works seamlessly with your heat pump for maximum savings.
Product Range
Battery Storage Systems We Supply
The Future of Home Energy
Cheap electricity windows are reshaping heating
Charging-window tariffs are changing how households in the UK pay for electricity. Instead of one fixed price all day, electricity is now much cheaper at certain off-peak times and more expensive during peak periods.
This change means batteries are no longer only useful for homes with solar panels. They now allow households to buy electricity when it's cheapest, store it, and use it later when prices are high. As the UK grid uses more renewable energy, these price differences are becoming more common and more important to take advantage of.
This is where heat pumps and batteries work especially well together.
Not only can a heat pump run during cheaper off-peak hours, but the battery can also be charged at the same time. That stored electricity can then be used later to run the heat pump during expensive peak periods, reducing the need to buy costly energy from the grid.
Together, they turn a home into a smarter, more flexible energy system rather than just a passive user of electricity.
Previously, this kind of optimisation usually required solar panels. Now, with charging-window tariffs and a more renewable-powered grid, batteries alone can provide real savings, especially when paired with heat pumps.
One homeowner's £1,200+ annual saving
Our Technical Director, Dave, installed a 10kWh battery alongside his heat pump system in a four-bedroom detached bungalow.
Before installing a battery, his total electricity costs were £2,838 per year on a standard tariff.
After switching to a time-of-use tariff and adding battery storage, this dropped to £1,625 per year. A saving of over £1,200 annually.
This was achieved by shifting the vast majority of his electricity usage into cheaper off-peak periods, with the battery storing low-cost energy and deploying it when prices are higher.
Why heat pumps + batteries matter now
- No solar needed. Dynamic tariffs make batteries valuable for any home
- Charge during cheap off-peak windows when renewables dominate
- Deploy stored energy during expensive peak times to power your heat pump
- Reduces grid strain whilst maximising savings. You're rewarded for helping balance renewables
- A genuinely smart energy system, not just passive electricity consumption