Say goodbye to energy waste — and hello to the future of hot water. The eSTOR™ Direct Thermal Battery is the world’s most advanced thermal energy battery, built to replace outdated, high-powered systems with a sleek, compact, and ultra-efficient solution. Using cutting-edge phase change technology, it stores more heat for longer and reheats faster — giving homes and buildings instant access to hot water without the bulk or the bills. Compatible with electric, solar, or traditional boilers, it’s a plug-and-play upgrade that reduces energy costs, slashes heat loss, and requires no annual servicing. All the performance, none of the fuss.
Direct-to-Core Heat Transfer - Heats the storage medium directly from a boiler, immersion or solar thermal source for maximum simplicity and performance.
Compact, Space-Saving Design - Half the footprint of a traditional cylinder, making it ideal for smaller homes, apartments, and tight plant rooms.
Fast Reheat Times - Stores energy rapidly and recovers hot water quickly
Ultra-Efficient Phase Change Material (PCM) - Holds up to four times more usable energy than water alone, delivering longer-lasting heat and lower running costs.
A+ Energy Rating - Exceptional insulation reduces heat loss by up to 50%, helping cut energy bills.
Low Maintenance, No Fuss - No Legionella risk, no annual servicing, and no G3 regulations — saving time and ongoing costs.
Time-of-Use Tariff Compatible - Charge during off-peak hours to take advantage of cheaper energy and support smart grid stability.
Works with All Heat Sources - Compatible with electric, solar thermal, and all types of boilers — easy to retrofit or install in new builds.
Robust, Quiet, and Safe - No moving parts or pressurised tanks — reliable, silent, and designed for long life
15-Year Warranty
Technical specification
ERP (Energy Efficiency)YYears Guaranteed15Standards MetCE, UKCAERP RatingA+Supplier Part NumberEHS-ES6-HW-EBrand NameEHS
Reviews
EHS 6KW Thermal Battery 150 Litre Direct EHS-ES6-HW-E