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.
Look above, to the side or behind the water heater for the gas supply line. Use a flashlight if there isn't enough natural light. Follow the supply line from the heater to the gas supply valve, which should have a valve handle on the top of the of the valve. Turn the valve handle clockwise until it stops.