Water tank assembly for heating device, and heating device

A heating device, comprising:

• a water tank assembly of the 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 assembly and a second side plate assembly that are opposite to each other, a plurality of first water boxes being defined by the first side plate assembly, a plurality of second water boxes being defined by the second side plate assembly, a water inlet and a water outlet being formed on the first side plate assembly, and each of the water inlet and the water outlet being in communication with one of the plurality of first water boxes;
• a main heat exchange pipe assembly comprising a plurality of first heat exchange pipes;
• a condensation pipe assembly located on a side of the main heat exchange pipe assembly facing towards the smoke outlet, the condensation pipe assembly comprising a plurality of second heat exchange pipes, the plurality of first water boxes being in communication with the plurality of second water boxes via the main heat exchange pipe assembly and the condensation pipe assembly, every two of the plurality of first heat exchange pipes being formed as a reciprocating heat exchange group, and each reciprocating heat exchange group being in communication with one of the plurality of first water boxes and with two of the plurality of second water boxes to form a series water passageway,
• wherein one end of a first one of the plurality of first heat exchange pipes in the reciprocating heat exchange group is in communication with one of the first water boxes, and the other end of the first one of the first heat exchange pipes is in communication with one of the two second water boxes;
• and one end of a second one of the plurality of first heat exchange pipes in the reciprocating heat exchange group is in communication with the other one of the two second water boxes, wherein the two second water boxes are in communication with each other;
• and
• a heat exchange fin assembly, at least some of the plurality of first heat exchange pipes and/or at least some of the plurality of second heat exchange pipes passing through the heat exchange fin assembly.