Water -cooled full premix gas heater

The utility model provides a water -cooled full premix gas heater, includes main heat exchanger, shaft type heat exchange coil, combustor, collection petticoat pipe and main control unit, main heat exchanger sets up on shaft type heat exchange coil's upper portion, still includes a fan and gas proportional valve, be provided with muddy trachea on the inlet port on the bottom plate of combustor base, the switch -on is connected with the air supply to the gas proportional valve inlet end, gas proportional valve's give vent to anger end and muddy tracheal radial inlet port intercommunication, and the end of giving vent to anger of fan communicates with muddy tracheal axial lower extreme, enthalpy exchanger is connected switch -on, enthalpy exchanger and water source intercommunication in advance with heat exchange coil in advance. Because adopt such structure, enthalpy exchanger preheats in the water -cooled combustor cold water in advance, firstly flame stabilizing is guaranteed by make full use of heat energy secondly, the cold water that preheats of enthalpy exchanger in advance, then get into main heat exchanger, make full use of heat energy has reached energy -conserving purpose. Setting up of fan guarantees that primary air is sufficient to carry out abundant mixing in advance with the gas, gas combustion is abundant, energy -conservation.