1. The price doesn't cover installation charges. I had to pay for nuts, bolts, and extra water pipe which should have been covered in installation charges 2. Also it doesn't cover charges you might need extra copper wire or extra electrical wiring 3. There is no 3-pin plug given so you would have to buy one if you want to fell safe 4. Make sure Voltas service guys know that you have bought it from Amazon as if you buy from Voltas directly installation charges are free and mounting stands come along with it!