Boomerang, a Belgian company, trusted Sunoptimo for its solar thermal system. At Boomerang, it is very important to have clean cars. The daily cleaning of the vehicle fleet reprensents huge hot water quantities. That's why the company opted for a rainwater harvesting system, which is heated-up by a solar thermal installation. The special rainwater tank that is combined with solar collectors allows Boomerang to produce 65% of its hot water needs thanks to the sun.