WNS series gas-fired or oil-fired boiler as the popular type of ZOZEN boiler is highly efficient and eco-friendly. In the finished warehouse, WNS series gas-fired or oil-fired boilers and all kinds of auxiliary machine and parts waiting for shipment are arranged orderly. The standard products can be delivered from stock. Intelligent production mode makes the delivery speed of ZOZEN Boiler faster than that of other boiler providers.