WNS series gas-fired boilers have exquisite outer packaging, the furnace temperature is controlled below 45℃, and thermal insulation materials with limited control of heat loss. The assembled ZOZEN gas boiler will be finally packaged in the outer packaging area, which is mainly divided into three steps. First of all, ZOZEN workers wrap the furnace body with aluminum silicate fiber, and then use refractory mud to keep it warm. Then, according to the size of the boiler, cut the stainless steel sheet into a suitable size, and then package the furnace tightly.