This idea directs heat in front of the curtains instead of behind them allowing more heat to be retained within the home instead of losing heat behind the curtains. Water fills between the double layer tubes and as it gets heated the hot air gathers within the tubes and rises through the centre of each tube and through vents at the top, heat also radiates outwards.
Designer: Danny Wan

Source: Heating Solutions by Danny Wan Yanko Design
Regards