There are two fundamental types of storage water heaters - vented or unvented. Unvented heaters store water at the incoming mains pressure, which is good in terms of offering high flow rates and permitting use of normal taps, but pressure relief valves are always needed and sometimes other accessories must be fitted as well.
Vented products are low pressure, gravity fed devices, with the storage tank open to the atmosphere.
Hyco Manufacturing's electric water heating range combines exceptional performance and style with superb value for money. Their latest products cover the needs of commercial and light industrial applications, and are backed up with free technical and sales advice and an ultra rapid nationwide distribution service. Wherever ther is a need for hot water there is a Hyco product to fit the bill.