First, make sure that everyone is respecting the other family members' need for hot water. You also want to check and see what temperature your water heater is set on. It is possible that the water is not being kept hot enough, therefore causing you to use more of it to draw a warm bath.
Finally, check all pipes and valves for leaks. You can also check covered and uncovered tanks for the storage of water online.
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Knowing the ins and outs of your hot water storage will save you some of the ups and downs associated with repairing your hot water storage.
In the majority of cases, gas is the fuel used to heat water up in the tank mainly because compared to electricity it's more economical. However, gas models are more expensive as compared to their electric counterparts.
But gas models will end up costing you about have as much as an electric heater. There are also a few oil-fired type heaters that are more expensive because they have an oil burner. This is why if you have just oil heat an electric water heater is a better option.