The Glow-worm Easicom 3 25 kW Heat-Only (Regular) Gas Boiler is a high-efficiency, wall-hung condensing boiler designed for homes with larger heating and hot water storage needs. As a heat-only (or regular) boiler, it requires an external cold water feed tank (in loft) and a hot water cylinder for storing domestic hot water, rather than delivering on-demand like a combi boiler. It’s suited to properties with more than one bathroom or high hot water demand, offering reliable central heating and stored hot water performance.