When gas is the better fit
Gas shines when you want the water warm for a weekend, a party or a cool evening, and you do not want to wait on a heat pump. Running a gas heater every day for months is usually more expensive than running a heat pump in this climate. Many homes use gas as a booster and a heat pump or solar system for everyday warmth. See heat pump vs. gas in Florida.
Fuel, venting and site conditions
The house needs a gas line with enough capacity, or a propane setup the contractor can size. Indoor or tight equipment rooms have venting and clearance rules the installer has to follow. Coastal salt air can be hard on cabinets, so ask about a unit and installation details meant for that exposure.
Repair vs. replacement
Ignition problems, a failing gas valve, or a heat exchanger issue can sometimes be repaired. If the unit is already near the end of a typical 5-to-10-year service life, get a repair figure and a replacement figure before you decide. More on lifespan is in how long pool heaters last.