Water overflowing the sink, seems more plausible than some missing caulk.  

Then wherever the water is getting discharged off of the roof, that what water is getting at least 4-5 foot away from the structure before it is left to drain with gravity away from the property. 

Water meter-water company.  

What if you turn on water and it goes everywhere.

Quote from @John Underwood: Gas heat would require constant tank refilling and it would be very bad to run out in the winter.In my experience, if you have  325 or 500 g tank, you can top off in the fall and be good until spring.....Unless I guess you have a big house and are keeping it at 80d.... 

I'm based in Powder Springs, Ga.I've always heard about real estate passively but it always went over my head and seemed beyond my reach. 

Good ol' fashioned spring traps.

And I will state different jurisdictions have different rules, processes, expectations, etc.In my area you are required to have a permit to swap a water heater.

Quote from @Aaron Wolman: I would call the companies (gas/water/electric) to get estimates, or an estimator out there.

Does the market there pick up more in the spring as other markets do?