Figs. 11 and 12 depict the mean water temperature in the HWT
and water temperature at outlet of the HWT under three different
shower temperatures, respectively. The experimental results
showed that with the increase of the shower temperatures, the
mean water temperature declined more rapidly, and concurrently,
the water temperature at the outlet of HWT reduced. It should be
noted that the curves with shower temperature at 42.0 C and
45.0 C in these Figs. 11 and 12 were similar, while an apparent
deviation was presented in that with shower temperature at
38.0 C. Specifically in Fig. 12, from 1.0 min to 10.0 min, the water
T