This invention relates to an apparatus for pressurizing a fluid and delivering a gas comprising a pump, an accumulator and a heater such that the pump pressurizes a quantity fluid received from a fluid store and delivers that pressurized fluid to an accumulator. The accumulator then delivers a quantity of the pressurized fluid to a heater that, in turn, warms the fluid to a gas within a specified temperature and pressure range to be delivered to the end user as required. The invention further relates to a method of delivering a gas at a desired pressure and temperature wherein a quantity of fluid is received, pressurized and stored as a fluid in an accumulator storage vessel at a desired pressure. The fluid is then delivered from the accumulator to a heater where it is warmed and delivered to the end user as a gas at specified temperature and pressure.