A method to save liquid and thermal energy in a liquid distribution system, where a centrally located source of liquid is connected via separate feeding conduits (FC1, FC2) to a plurality of liquid tap units (LT1, LT2), comprising the steps of - evacuating the liquid from the associated feeding conduit, after completion of a tapping operation at the associated liquid tap unit, by generating a backward pressure gradient in said associated feeding conduit by means of a liquid evacuation pump, so that the liquid flows backwards towards said liquid source and said associated feeding conduit thereafter contains only gas being retained therein, and - refilling, upon activating said liquid tap unit, said associated feeding conduit with liquid by generating a forward pressure gradient in said associated feeding conduit and permitting liquid to flow from said liquid source to said associated liquid tap unit, while pushing the remaining gas in the feeding conduit towards said associated liquid tap unit at an operating pressure exceeding an ambient air pressure level, characterized by keeping each of said feeding conduits (FC1, FC2) during the entire operation of the liquid distribution system, in communication with an associated dampening chamber (D1, D'1, D"1, D2) via an associated gas passage (OP1, 0P'1, OP"1, OP2), - said associated gas passage accommodating an inlet (IN1, IN2) to a liquid valve (V1, V'1, V2) which is connected to said associated liquid tap unit (LT1, LT2) and - said feeding conduit, said associated gas passage and said associated dampening chamber forming, in use, a closed system being separated, in respect of the remaining gas therein, from the ambient air, evacuating, during the evacuation step, all liquid from the particular feeding conduit and said associated gas passage by means of said liquid evacuation pump, while reducing the pressure of the remaining gas down to a lowermost pressure level, which is substantially lower than the pressure level of the ambient air at said associated liquid tap unit, bringing the refilling liquid, during the refilling step, to flow through said feeding conduit and beyond said associated gas passage (OP1, 0P'1, OP"1, OP2) while pushing said remaining gas, by means of said operating pressure which is substantially higher than said ambient air pressure level at any one of said liquid tap units, into said associated dampening chamber (D1, D2) and keeping said liquid valve (V1, V'1, V2) closed during the refilling step, until the refilling liquid has reached said inlet and passed beyond said associated gas passage, whereupon the liquid valve (V1, V'1 V2) is caused to open so as to let the refilling liquid, but no gas or air, flow via said liquid valve (V1, V'1 V2) into said associated liquid tap unit (LT1, LT2). - evacuating the liquid from the associated feeding conduit, after completion of a tapping operation at the associated liquid tap unit, by generating a backward pressure gradient in said associated feeding conduit by means of a liquid evacuation pump, so that the liquid flows backwards towards said liquid source and said associated feeding conduit thereafter contains only gas being retained therein, and - refilling, upon activating said liquid tap unit, said associated feeding conduit with liquid by generating a forward pressure gradient in said associated feeding conduit and permitting liquid to flow from said liquid source to said associated liquid tap unit, while pushing the remaining gas in the feeding conduit towards said associated liquid tap unit at an operating pressure exceeding an ambient air pressure level, - said associated gas passage accommodating an inlet (IN1, IN2) to a liquid valve (V1, V'1, V2) which is connected to said associated liquid tap unit (LT1, LT2) and - said feeding conduit, said associated gas passage and said associated dampening chamber forming, in use, a closed system being separated, in respect of the remaining gas therein, from the ambient air,