Method and system for supplying vaporized gas on consumer demand

A gas supply system for supplying a combustible vaporized gas to a consumer, according to consumer demand, the gas supply system comprising:

• (a) a storage tank for storing liquefied gas, said tank having a lower liquid region and a vapor region thereover;
• (b) a heating system for providing heat to said storage tank, said heating system including:
• (i) a heat exchanger external to said storage tank, said heat exchanger disposed in a heat-exchange relationship with a wall of said storage tank;
• (ii) a reservoir for storing a heat-exchange liquid for said heat exchanger;
• (iii) a first line connecting said reservoir and said heat exchanger, and a second line for returning said heat-exchange liquid from said heat exchanger to said reservoir, and
• (iv) a pumping device for delivering said heat-exchange liquid from said reservoir to said heat exchanger, via said first line;
• (c) a delivery line for transferring the vaporized gas from said storage tank to the consumer, and
• (d) a control system associated with said heating system and configured to control a heat supply to said storage tank, by means of said heat-exchange liquid, such that said storage tank produces the vaporized gas at sufficient pressure so as to meet the consumer demand.