
Electric Hot Water On Demand
Efficient, compact, and sustainable – Sunamp heat batteries are revolutionising hot water systems with their award-winning technology and long-term performance.


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What is a Sunamp Heat Battery?
The Sunamp is an innovative electric water heater that stores energy and delivers hot water efficiently without needing a tank. It replaces bulky hot water cylinders with a compact, energy-saving unit that uses a specialist core to store heat.
Whether paired with renewable energy sources, off-peak electricity, or a traditional supply, a heat battery offers a better way to heat water for your home.

Instant Hot Water
Get hot water on demand to your tap or shower head.

Compact Design
Fits neatly into tight spaces, offering a practical solution for modern homes.

Efficient Technology
Minimises energy use while delivering consistent performance for reduced costs.

Renewable-Ready
Integrates with solar and other renewable energy systems for sustainable water heating.
How the Sunamp Heat Battery Works
The Sunamp electric water system uses advanced phase-change technology to store heat and deliver hot water on demand efficiently. The main difference is you’re storing heat, not water (like with a traditional system), so you only heat the water you need when it’s needed – massively reducing waste.
Here’s how the system works:

Phase-Change Material (PCM)
The core uses Plentigrade, a PCM that absorbs energy during charging. This material stores the heat until it’s required, offering efficient thermal storage of between 3.5 kWh and 14 kWh.
Electric Charging
The battery charges using electricity from multiple sources, including off-peak tariffs, solar panels, or standard mains supply. This flexibility helps reduce energy costs.
Thermal Retention
High-grade insulation keeps the stored heat for days, minimising heat loss and ensuring hot water is always ready.
Instant Hot Water Delivery
When you turn on the tap, the Sunamp instantly transfers stored heat to the water, eliminating the delay associated with traditional water heaters.
Upgrade to a Better Way to Heat Water
Ready to modernise your hot water system? Get in touch to find out how the Sunamp Heat Battery can transform your home’s energy efficiency.
Built for Long-Term Performance
The Sunamp electric heat battery is proven to last for 50+ years with normal use and requires minimal maintenance.

Durable Design
No moving parts to wear out or break down.

High-Grade Insulation
Retains heat effectively for long-lasting performance.

Minimal Maintenance
There's no mandatory servicing, so no expensive engineer visits.

Safe Operation
No risk of overheating or pressure build-up like with traditional tanks.
Is a Sunamp Heat Battery Right for You?
The Sunamp Heat Battery is an innovative electric water heating solution that brings many benefits.
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Takes up less space than traditional water tanks.
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Stores and retains heat effectively, minimising wasted energy.
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Doesn't require gas mains access.
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Works with off-peak tariffs and renewable sources like solar panels.
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Suitable for homes with low water pressure.
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Delivers hot water on demand without reheating delays.
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Durable, 50+ year lifespan.
Common Sunamp Questions
What people ask us about the Sunamp Heat Battery.