With the computer simulation technology, the wall-mounted solar heater with ionization reaction in the greenhouse reconstruction test is analyzed, and the thickness of the existing dwelling wall (= 370mm) well fit the bill for the full loads of the collectors and water storage tank. The water heater and solar collector can be installed at the wall between window, the windowsill wall and the parapet wall. The installation of the solar collector and the storage tank does not impact the indoor temperature and humidity. Water storage tank can be mounted in the outer wall chamber near the solar collector; pipeline from the storage tank to the water point can penetrate the wall surface, run under the ground the shed, and can be hidden by the decorative members. It is found via the experiment that the wall-mounted solar water heater can be installed and integrated in the existing residence for meeting basic living conditions. This experiment provides the clues to the installation of wall-mounted solar water heaters for greenhouse reconstruction, and contributes much to the expansion of the use of clean renewable energy resources.