The PRIMUS tankless WC is characterized by a simple and pure design. It takes up less space. The applied Venturi-system together with AXENT Airless Siphon Technology make a powerful water flush possible without the need of a tank. AXENT tankless technology, a breakthrough in WC standards. It is using about 25% less water than a conventional siphonic toilets. You may save cost as well. No need of a cistern or an electric pump.