Efficient Gas Water Heaters (Storage Type)

I am planning to buy 02 No. Gas Water Geysers. What are the best options available keeping in view the fuel efficiency?

almost all brnads are equal. quality is based on thickness of the the sheet of metal and the thermostat. italian taiwan thermostat are better for long term and fuel saving.

add a conical befel if your gyser supports or comes built in.