I have a gas hot water heater in my basement.
I have been in the house for two years. The hot water heater is probably 5-7 years old.
In the past three months or so, the pressure relief valve has released water 4 times.
Recently, I turned the temperature down a bit, but it just took another dump the other day.
There were no other problems with it the first couple of years.
I have city water.
Hot water in the house seems fine. 3 of us share two bathrooms. We probably use 7k gallons a month.
The pressure relieve valve is screwed into the top of the heater with copper running across and then down to within a couple of inches of the floor.