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.
Water heaters come in two different styles: tank and tankless. Both heat your water, but they do it in different ways. A tank style water heater stores a given amount of water, usually 40 to 50 gallons, and keeps it heated to the temperature you set it at, sending it along when you open the hot water tap. A tankless system doesnât store the water and heats it only when you need it by means of a series of super-heated coils.