[Alu-plus]

The Buderus GB162 wall-hung condensing boiler range uses an advanced aluminium ALU-plus exchanger design. The lightweight aluminium heat exchanger has a number of innovative features that prolong its life and increase the efficiency of the boiler. Fins on the outside of the aluminium tube increase the exterior surface area so that more hot flue gas comes into contact with the heat exchanger. A spiral channel on the inside of the tube increase the internal surface area and creates turbulence which brings more water into contact with the heating surface ensuring an optimum transfer of heat.

The surface of the heat exchanger tubes are treated using a patented plasma-polymerisation process which leaves the surface so smooth that no deposits can adhere to it. The heat exchanger effectively stays clean. The extremely high efficiency is maintained and there is no need for mechanical cleaning, the heat exchange can be simply flushed through during servicing.