OVO and Havenwise launch heat pump trial to make home heating smarter and more affordable

London, 17 October 2025: OVO and Havenwise have announced the Heat Pump Flex Trial, a winter programme designed to help households cut heating bills, reduce carbon emissions, and stay comfortable by using heat pumps more intelligently.

Running October 2025 through March 2026, the trial will explore how flexible, data-driven control of heat pumps can lower costs for customers while supporting the UK’s transition to a low-carbon energy grid. The trial will include selected OVO customers with Vaillant or Mitsubishi heat pumps, using Havenwise’s smart-control app and algorithms.

Customers will set their comfort preferences in the Havenwise app. From there, Havenwise will remotely optimise the heat pump to use power at greener, off-peak times, while customers remain in full control of temperature settings. 

The trial announcement follows recent news that shows the continued decline in supplies from the UK Continental Shelf (UKCS) has resulted in the tightest gas supply margins in four years.

That is according to National Gas’ latest Winter Outlook for 2025, which forecasts peak demand, supply capability, and key considerations for the upcoming winter.

OVO’s existing Heat Pump Plus tariff add-on already enables customers with compatible heat pumps to pay just 15p/kWh for electricity used by their heat pump, helping make clean heating more affordable.

Henri Casteleyn, Co-Founder, Havenwise said: “Havenwise exists to make heat pumps better for homeowners: lower bills, easier control, fewer worries. This partnership is the first of its kind and will show what’s possible with heat pumps.” 

Chris Watling, Clean Heat Lead, OVO said: “This trial is a chance to show how intelligent heat-pump control can deliver both comfort and cost savings, while supporting a greener grid. With Havenwise onboard, we believe many households will see real benefits without needing to lift a finger.”

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Notes to editors

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About OVO

In 2009, OVO was born to make energy better for people and the planet. Today, OVO is trusted by around four million customers with their home energy, EV charging, green tech upgrades, and more. 

OVO is getting the UK ready for a greener, fairer future – supporting new renewable power projects in communities across the country. Not only is OVO bringing low carbon tech into homes, it’s finding smart ways to cut costs for customers – making heat pumps, solar panels, and electric cars more accessible. Behind all this work is Plan Zero: the bold, science-backed sustainability strategy, which sets out how OVO will become a true net zero business by 2035. 

This progress can only happen with a culture fit for the future. OVO’s multiple awards include the Best Place to Work for Women in The Sunday Times’ Best Places to Work 2023, which also saw the company coming in the Top 10 for Very Big Organisation. 

OVO also won Company of the Decade at the BusinessGreen Leaders’ Awards 2020. 

About Havenwise

Havenwise is making heat pumps easier and cheaper to use for homeowners, and more efficient to commission for installers. Its software automatically commissions, optimally controls, and continuously monitors heat pumps in real time, without the need for extra hardware. Homeowners enjoy lower bills, simpler control, and better performance, while installers save hours of time and reduce call-backs. Founded in the UK in 2024, Havenwise builds on years of prior technology development and strong collaboration with heat pump manufacturers.