Varactor doublestage heat pump boiler central heating replaces unit

The utility model relates to a heating technique, especially a varactor doublestage heat pump boiler central heating replaces unit. It includes the superconductive heat pump hoisting device of clammy weather phase one -level, cold climate phase second grade high temperature heat pump hoisting device. This device lies in that the higher hot pump performance of clammy weather phase outdoor temperature improves, and the required heating load of building heat supply reduces relatively, and the heat supply temperature can reduce relatively, selects the heat supply of the superconductive heat pump hoisting device of one -level to be favorable to the energy saving to improve hot pump performance, and the built -in low temperature nanometer superconduction liquid of system's adoption absorbs the promotion of the clammy heat source of haze with the cooperation of closed heat source tower and directly is used for heat supply output for high potential energy, the decay of the lower hot pump performance of cold climate phase in winter outdoor temperature to the heat supply temperature that needs after the heating system transformation of boiler is higher relatively, automatic selection second grade high temperature heat pump hoisting device, and the medium temperature potential energy of one -level heat pump stepless speed control firm output reaches the hot water heat supply temperature of boiler more than 65 DEG C through the promotion of second grade high temperature heat pump as the well potential temperature heat source of second grade constant volume heat pump again.