Zero Emission Boiler (ZEB®)
Boilers play a big part in the climate crisis. Switch to one powered by a cleaner alternative – electricity.
Tepeo ZEB refers to a heat battery boiler made by the UK company tepeo. It’s a new type of low-carbon electric home heating system designed to replace traditional gas, oil, or electric boilers with a greener alternative.
What the ZEB Is
The ZEB (“Zero Emission Boiler”) is an electric heat battery boiler that uses electricity to store heat and then release it on demand for your home’s central heating and hot water — using existing radiators or underfloor heating and pipework.
How It Works
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The ZEB charges up using electricity (best on cheaper, off-peak tariffs) into a thermal core that stores heat.
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It then releases this stored heat to your heating system when your thermostat calls for it.
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It learns your home’s heating needs and local weather/energy price signals so it can charge intelligently for efficiency and cost saving.
Key Benefits
✔ Lower running emissions: Since it uses electricity, the ZEB produces zero direct carbon emissions at the point of use (no flue gases).
✔ Cost savings: By storing heat when electricity is cheaper and greener (e.g., overnight), it can run up to ~£1,500 a year cheaper than conventional electric boilers.
✔ Easy installation: It generally installs in 1–2 days on existing plumbing without needing an outdoor unit like a heat pump.
✔ App control: You can monitor and control your ZEB from the tepeo smartphone app.
Typical Specs (for the Core ZEB unit)
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Heat storage capacity: ~40 kWh
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Max heat output: ~15 kW
Ideal Homes
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Homes with a “wet” heating system (radiators or underfloor heating + hot water tank).
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Homes that can benefit from time-of-use energy tariffs (e.g., cheaper night-time electricity).
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Properties where heat pumps are not suitable or too disruptive.
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Meet the ZEB
The future of heating is clean, green and affordable. Our award-winning Zero Emission Boiler (ZEB®) is revolutionising the way we heat our homes.
Mixergy is a UK-based company that makes smart hot water cylinders and thermal storage systems designed to cut energy use, save money, and integrate with modern energy systems like solar PV and heat pumps. Their products aren’t traditional boilers — instead, they focus on storing and managing hot water more efficiently than conventional cylinders.
What Mixergy Products Are
Mixergy X
A smart, connected hot water cylinder that works with almost any heat source, including:
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Gas boilers
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Electric immersion heaters
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Heat pumps
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Solar PV (via diverters or direct integration)
Key features:
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Top-down (volumetric) heating: heats only the portion of water you actually need, reducing waste and speeding up recovery times.
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Smart control: Manage schedules, monitor hot-water levels, and boost via the Mixergy app.
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Integration with smart tariffs & renewables: Helps you make the most of cheaper electricity or solar power.
This technology can significantly reduce grid energy use for hot water — experiments show over 35 % reduction in grid import when connected with solar PV.
There are versions like Mixergy X Direct (electric-only cylinder) and larger indirect models that work with boilers or heat pumps.