Discover world-leading thermal storage Thermino heat batteries are modern-day, energy-saving thermal stores made with a high-performance phase change material to deliver fast-flowing hot water reliably, safely, and efficiently. Up to four times smaller than the equivalent hot water cylinder, the sleek, super compact design means the Thermino looks great in any home and free up valuable storage space. They are also easy to install, kinder to the environment and require no mandatory annual maintenance.