Abstract: An assembly including: a central enclosure including: an inner wall that is water-resistant and non-corrosive, an outer wall that is transparent, the inner and outer walls hermetically sealed together to form a watertight compartment defined between the inner and outer walls, an inlet port located on a lower portion of the central enclosure, an outlet port located on an upper portion of the central enclosure, and a solar collector member disposed inside the watertight compartment, the member being disposed between the inner and outer walls; an external glass pane spaced apart from the outer wall and defining an external insulation layer of gas between the external glass pane and the outer wall; and an internal partition spaced apart from the inner wall and defining an internal insulation layer of gas between the internal partition and the inner wall.

Abstract: A method for purchasing goods or services by a customer from an E-Merchant, including the steps of: establishing a connection between the customer and the E-Merchant over a distributed public network; the customer deciding to purchase at least one item from the E-Merchant using a charge card, the charge card having a plurality of associated charge card details; sending at least a part of the charge card details from a computer system of the customer to an authorizer of the charge card; sending a transaction summary of a transaction from the E-Merchant to the authorizer, the transaction including the at least one item; authorizing the transaction, by the authorizer; and sending a confirmation of the authorizing of the transaction to the E-Merchant, wherein all the above steps are performed such that the E-Merchant is prevented from receiving any part of the charge card details.