HomeAdvisor’s Water Heater Cost Guide lists pricesociated with installing or replacing a water heater including labor and materials, as reported by HomeAdvisor customers..Solar water heating SWH is the conversion of sunlight into heat for water heating using a solar thermal collector.A variety of configurations are available at varying cost to provide solutions in different climates and la.udes. SWHs are widely used for residential and some industrial applications..Traditional vs. Tankless. As far as convenience goes, many home garages and ba.ts already have tank water heaters. These are actually less expensive and more convenient to install than tankless water heaters A tank heater also requires less maintenance, whereas many tankless heaters need a professional to come out once a year to flush the system of calcium deposits..Solar water heating systems have a good economic payoff, and are manageable systems to install or build as a DIY project. Some of the solar water heating designs are very simple and low cost..