Household size The number of people living in your home and your water consumption patterns Household size The number of people living in your home and your water consumption patterns Of the many different types of Solar water heaterson the market, the best hot water system for your home will depend on your situation. Consider the following. Household size The number of people living in your home and your water consumption patterns (ie whether you all shower at the same time of day; run the dishwasher, washing machine and bath at the same time)...