For the domestic sector, the feasibility of SHWS has been studied for medium size
families in three locations, representing the main climatic types in this country. The optimum
criteria for designing SHWS have been also investigated. From the analysis undertaken, it
can be concluded that, for the domestic sector, the use of SHWS is not yet economically
advantageous compared with electrical hot water systems. However, the economics of
SHWS in Vietnam will be more attractive if the government assists with correct policies to
encourage people to use SHWS. By contrast, for the commercial sector, it was shown that
the application of SHWS is very feasible due to the high electricity prices experienced by
this sector.