Abstract: The invention relates to a mixing device with an input container that is configured for receiving a product that includes a fluid component and a second component. A whipper with a conical whipper surface has an axis is configured for aerating and frothing the product. The whipper surface extends between first and second end portions, with the first end portion having a smaller diameter than the second end portion. The whipper surface is preferably oriented at a surface angle to the axis of about between 5° and 65°. A motor is in driving association with the whipper for rotating the whipper about the axis at a speed sufficient for aerating and frothing the product. A product exit conduit is disposed downstream of the whipper and is configured for dispensing the product of the fluid and second components.

Abstract: Disclosed is an installation for the preparation of hot water. The installation includes a cold water reservoir, a heating unit, a cold water pipe between the cold water reservoir and the heating unit, a draw-off point for drawing off hot water, a hot water pipe between the heating unit and the draw-off point and a pump for making water flow from the cold water reservoir through the cold water pipe, the heating unit and the hot water pipe to the draw-off point. A vent pipe is connected to at least one of the said pipes.