I have been using a remson water heater of capacity:25 litres since 7 years now, I just bought one more of the same from a shop in bangalore a new model which looks oval in shape and new and has better features than the old one, some of the features would be fully automatic and a very high power saving puf insulated tank and body.
this water heater had a very good look compared to any other water heater and the shop keeper gave me a good view of the heater by explaining to me about every feature it had on a display piece a really good and knowlegable experience you should really look into.
as I have been using hard water in my place I have never placed a problem just like I had a problem in my guest bathroom where I has a johnson geyser which failed.
Would certainly give an open opinion this water heater is a wonderful water heater.