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.
Gas or Electric. The first thing to figure out is if you have a gas or electric water heater. Grab a flashlight and head down to where your hot water tank is located. Take a look at your water tank and see if the instructions stickers on the tank talk about having a pilot light or how to light the pilot.