When training to turn out to be a gas engineer, you must focus on courses that cover the training for the appliances you want to work with, similar to CENWAT (central heating boilers), HTR1 (gas fires) and CKR1 (gas cookers). http://www.rminformatique.com/4000I_EXTURL.php?url=aHR0cHM6Ly9jbGFzaG9mY3J5cHRvcy50cmFkZS93aWtpL0luZGljYXRpb25zX1lvdXJfQm9pbGVyX1JlcXVpcmVtZW50c19SZXBsYWNlbWVudA