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.
Subject: replacing tank hot water heater with tankless. My house in a rural area that has no natural gas available, and no propane tank on the property. The whole house is electric, and if I need to replace the hot water heater I would prefer to go tankless for the spacing savings as well as the usage costs. I would expect the tankless to be no more of an electrical drain that the tank, and I would expect a loss less energy cost.