You should check the age of your hot water system, the heat source, and the size. You
can find the age and warranty information on the badge. Most hot water tanks last
around ten years, so if the one in the house is close to that age, you will need to check
the tank for any sign of corrosion or leaks.
It would help if you also took note of the size of the hot water tank. The hot water tank
should be at least 50 gallons for a family of four, so you will need to consider it if you
have a larger family.