What's the best type of solar water heater?
I am in the process of renovating a bathroom that hasn't been used since before i was born, which currently lacks a water heater. Being poor, it is very unlikely that i will be able to buy an on-demand heater for this bathroom, and i know how inefficient normal water heaters are, so i am looking into solar water heaters. I live in a sub desert climate, so catching sun is not a particularly big issue, but i am looking to find out what type of heater is most efficient, both as far as heating water, and cost. would i be better off with a passive, or active system, and what other recommendations do you have for solar water heating?