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.
Turn off the power to the water heater in your electrical panel, and then check the power wires at the water heater with a multimeter to make sure that the power is off. Drain the water out of the tank using a common garden hose attached to the drain valve at the bottom of the water heater near the floor. Remove the elements from the water heater. You can clean them with a mixture of vinegar and water, or sodium carbonate and water.