Pre-heating unit for water incorporates warming pipe, the use of heat-transfer materials, thermal insulation, heat exchanger and cold water flow.

摘要

The cold water (6) flowing to the water-heating-preparation unit (17) is pre-heated. The water pipe is coiled round the warming pipe (5) such as the chimney of a heating unit and heat-transfer-enhancing materials (7) and thermal insulation (8) used. The cold water (3) is conducted through a heat-exchanger in the heating-flow (1,2) and inside the heating-pipe.