Gas appliance Heat Input and Gas rate Calculator. Used to check appliance gas consumption against data badge or manufacturer instructions. Conforms to Regulation 26(9) gas safety installation and use regs 1998. Covers Natural Gas, Propane, Butane and LPG mixtures. Imperial, Metric and digital meters including Landis and Gyr. Right or Left handed use. Has a detailed Help page built in. App settings for default Gas type, Meter type Calorific values and Gross to Net calculation ratios. Not interrupted by incoming calls or SMS. Gives results as Gas Rate in litres/sec, m3/hr and ft3/hr, Net and Gross Heat Input in KW, Net and Gross Heat Input in BTUs.