It is used for the hot water needed in the facility. Here, the heated water is conveyed to the machines in the facility with the circulation pump and circulation is ensured. Multi-functional electronic control panel that is easy to use, increases safety and reduces electricity-fuel consumption. More heat transfer surface has been obtained with the oblique layers placed on top of each other instead of the pipe, and it has a comfortable use with the feature of adjusting the combustion air according to the amount of fuel in the electronic control panel, and the sleep mode feature. The adjustable fan flap helps to adjust the combustion speed according to the chimney draft. It is highly efficient and economical with its four-pass heat transfer surface and flame smoke pipes. More efficient combustion is achieved thanks to the large fuel tank (bunker) and the specially designed cast iron crucible whose fuel sieve system can be removed, and the primary and secondary air system. Heat losses are minimized by using ceramic-based refractory on the boiler front covers and high-density insulation materials on the hot surfaces of the body. Thanks to the ash discharge system, the boiler can be cleaned easily.