Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding·Page 11·Diagram 1.2
Unvented hot water storage system — Unit configuration
Diagram 1.2 illustrates a typical indirectly heated unvented hot water storage system in Unit form, with separate heat source and safety device arrangement including expansion vessel, temperature relief valve, tundish, pressure reducing valve, and primary flow/return circuits.
Diagram 1.2 Unvented hot water storage system — Unit *
Expansion vessel, expansion valve, tundish, temperature relief valve, pressure reducing valve with strainer, stop valve, water main, discharge, check valve, hot water, motorised valve, primary flow, primary return, heat source.
Heating can be direct or indirect. This diagram illustrates a typical indirectly heated system.
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