Company Brief : WENNO is a water supply and heating installations manufacturer and we have lots of experience in water supply "ball valve & pipe fittings" and heating installations manufacturing. The invention relates to a heating installation comprising a closed liquid circuit which is under pressure during operation, in which are incorporated a heating boiler in which heat is supplied to a liquid circulating in the circuit and heat-generating means such as radiators and convectors, further comprising a pressure-less liquid reservoir connectable by valve means to the circuit, which valve means are mechanical valve means controlled by the pressure in the circuit. We can provide the best in water along with timely delivery and flexible payments. Besides our products and services, we have the capability to install and repair a wide range of heating and cooling systems. We also offer services that include preventive maintenance programs.