The utility model is related to the field of heat-and-power engineering and can be used for increasing the efficiency coefficient of domestic boilers with surface heating of coolant. The basic problem solved by the model is to increase the coefficient of efficiency of domestic use boilers with surface heating of coolant. This is realized by the use of the device for domestic boilers, built according to method of surface heating of coolant (all rights belong to the inventor Vasil Pavlenko).