Company Mr Combi Training created these great apps:
Gas Ratio Calculator, Gas Pipe Sizing Calculator, Gas Ventilation Calculator UK, Gas Rate Calculator Lite, Gas Rate Calculator & Guide, Ohm's Law Calculator & Guide, Electrical Safety Tests, Heatloss Calculator & Guide, Expansion Vessel Calc & Guide, Wiring & Controls - Diagrams, Fault Finding & Multimeters, Wiring & Controls, Boiler Fault Codes, and others..
