I live in a rented apartment. My owners fixed AO Smith 1 litre water heater for the bathroom. In three months, the red light did not get ON even though the water was hot. I called up the customer service. The same day the service guy came and fixed the problem.
After one year, water started leaking from the piece. I called up customer sevice again and as usual, the same day, the same guy came. He tried fixing it, but the leakage was from the drum. The drum has 5 years warranty against leaks. He made order for another drum and fixed it in 2 days.
The guy was knowledgeable, was polite, did the job neatly. He answered all my questions. From what he says, he is supposed to fix any problem that arises within a day or two. And that was the case with both my issues.
Though I mentioned two problems, the first was an installation mistake did by my local electrician and the second was a rarest of rare cases. The drum is thoroughly checked during manufacturing, otherwise it is replaced for upto 7 years.
I have been very impressed with AO Smith and I would definitely recommend their products to all my friends.