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.
There are two different types of water heaters: tank and tankless. A tankless water heater produces water on demand by heating the water as you need it. A tank style water heater heats the water that is kept in a storage tank. The larger the water heater tank, the more hot water it can store.