Water tank assembly of heating device, and heating device

A water tank assembly of a heating device, the water tank assembly comprising:

• a tank body having a smoke inlet and a smoke outlet, the tank body comprising a first side plate and a second side plate opposite to the first side plate;
• a condenser pipe assembly disposed in the tank body and located at a side of the tank body, wherein the side of the tank body faces towards the smoke outlet;
• a main heat exchange pipe assembly disposed in the tank body, heat exchange pipes of the main heat exchange pipe assembly closest to the smoke inlet being a first heat exchange pipe layer, the heat exchange pipes of the first heat exchange pipe layer being in communication with one another to form a serial water passageway;
• and
• a heat exchange fin assembly, the main heat exchange pipe assembly and the condenser pipe assembly at least partially passing through the heat exchange fin assembly.