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 the power off, turn the water supply off and you will need isolation valves on top of the water heater to shut. This will create a tank vacuum. You can then pull the heater element out faster and push the new one in just as fast. You will loose about 2 cup fulls of water if you are good.