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.
Before you install this type of water heater, check with your gas company for proper sizing of your gas main. Typical tankless heaters require more gas than the largest residential furnaces. Measure and cut your copper pipe. Burr and polish the pipe, then apply flux to it and the fitting.