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.
The pros. Electric tankless water heaters can be placed very near the point of use, resulting in exceptionally short wait times for hot water. They are small and will easily fit under a sink. Most don't require a separate pressure/temperature (PT) valve and dedicated drain line.