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.
But standby energy loss is significant with traditional hot water heaters, and once youâve exhausted the hot water supply, youâll wait 20 to 60 minutes for the heater to cook up more. A tankless water heater produces hot water only when you need it. When you turn on the faucet, water is heated on the spot as it flows through capillary-like pipes heated by either a powerful gas burner or electric coils. (There are no oil-fired on-demand water heaters on the market.)