Hot water storage calorifiers are designed to raise the temperature from cold to the storage temperature (Typically 60°C) for domestic usage. Unvented hot water systems have become extremely popular for building applications as they provide a highly efficient means of storing and distributing water. The standard range are vertical and horizontal type manufactured from copper-lined steel, stainless steel, Galvanized steel and epoxy coated steel. The heater battery is manufactured from copper finned tube offering a hygienic, reliable long life. The heater can be withdrawn for cleaning and inspection purposes.