Evacuated Tube Collector This collector measures approximately 4 square metres and serves a household with one bathroom and one ensuite. Tube Close-up Evacuated tubes perform particularly well in cold weather. Individual tubes can be orientated to face the sun on some models. Tube Array These tubes contain a parabolic reflector that compensates for slight misalignments in orientation. Small Evacuated Tube Array Evacuated tubes take up slightly less space on the roof than flat plate collectors. Installation of Collectors In this case, the collectors are installed near the ridge on a dormer roof. A flat plate collector would have been too large for this site. Large Array For community centres and shared facilities large arrays are possible. In the summer months, a swimming pool is ideal to dump excess heat.