Rico in Spanish means rich in English just if your talking about money. If your talking about food rico means it's delicious, good, etc. Example, esto huele rico mean this smell good or  que Rica la comida means like delicious food in English. Puerto Rico means Rich Port in Spanish.
Tankless or demand-type water heaters heat water directly without the use of a storage tank. Heat pump water heaters move heat from one place to another instead of generating heat directly for providing hot water. Solar water heaters use the sun's heat to provide hot water.
Electric tankless heaters are easier to install but are incapable of heating up large amounts of water to be usable. A basic size requirement for choosing between them is that for one or two people, a tankless electric heater may be adequate. For more than two people, a gas fired tankless heater is the way to go.