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.
Whether you go with a tankless electric water heater or a tankless gas water heater, with tankless you get the advantage of less energy consumption and a smaller unit. For tank water heaters you should consider your household size and the amount of space you have to store the unit.