The invention provides a gas water heater production technology. The technology comprises the following steps that 1, parts are preinstalled, and a combusting heat exchange part, a bottom cover part,a face cover part and a proportional valve square pipe part are preinstalled; 2, body assembling is carried out, the bottom cover part is labeled, a water input and output connector is installed, theproportional valve square pipe part is installed, the combusting heat exchange part is placed, a gas input connector is fixed, and a water input and output water pipe and the combusting heat exchangepart are fixed; 3, device assembling is carried out, a body is inclined to one angle, a wind pressure switch and an ignition needle inserting wire are installed, a wire is inserted into a main board,code scanning is carried out, and the body lies flatly and is reset; 4, pre-detecting is carried out, electrical performance detecting is carried out firstly, then the body is turned over to be vertical, and water way pressure resisting detection, automatic parameter adjusting detection, comprehensive performance detection and internal structural detection are carried out; 5, face cover assemblingis carried out, the body lies flatly and is reset, and then the installing face cover part is installed; 6, final detection is carried out; and 7, products are packaged and put in storage. The technology has the beneficial effects of being convenient to assembly, and achieving production automation easily.