Where exactly is the water coming from?
Ask the plumber to show you. A fitting, a relief valve or the pan is a repair; the tank body is not. This single answer decides most of the outcome.
Water Heater: Repair or Replace?
The short answer: if the tank itself is leaking, replace it. If a part has failed and the tank is sound, repair it. San Antonio 24 Hour Plumber helps San Antonio customers work out which of those they are actually looking at.
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Compare What the Test Finds
| What the inspection finds | Repair may suit | Replacement may suit |
|---|---|---|
| Where the water is coming from | A fitting, valve, relief line or connection above the tank | Water seeping from the body or base of the tank itself |
| The failed component | Thermostat, element, thermocouple, igniter or dip tube | Multiple parts failing together, or a part no longer available |
| Age of the unit | Comfortably within its expected service life | Well past it, with no flushing or anode history |
| Scale and sediment | Flushing or descaling restores normal performance | Heavy scale plus corrosion the flush cannot reverse |
| Repair history | First fault on an otherwise reliable unit | The third call in two years on the same heater |
| Household demand | The current unit still keeps up with the house | The unit was undersized, or the household has grown |
When Repair Is Worth Considering
Most water heater calls end in a repair, and that is the right outcome. Thermostats, heating elements, gas control valves, thermocouples and dip tubes all fail in ways that stop hot water completely, and all of them are replaceable parts on a tank that is still perfectly sound. A unit that rumbles, heats slowly or runs out early is very often just carrying a thick sediment layer — draining and flushing it can bring back performance people assumed was gone for good.
Hard Edwards Aquifer water makes that scenario more common here than in many places. Mineral drops out every time the water is heated and collects on the bottom of a tank or inside a tankless heat exchanger. It looks like a failing appliance, it sounds like one, and it is maintenance. Details of what gets tested are on the water heater repair page, and no hot water: what to check first covers the safe things you can look at yourself before calling.
When to Discuss a Replacement
There is one finding that ends the discussion immediately: water coming from the body or the base of the tank. That is the steel shell corroded through, and there is no repair for it — the unit needs replacing, and it should be treated as urgent, because a tank that is seeping can eventually let go completely.
Beyond that, the honest cases for replacement are a unit well past its expected life with no service history, repeated faults on the same heater, and a heater that was never big enough for the house. Age alone is not one. A twelve-year-old tank that has been flushed and had its anode rod replaced can be in better condition than a seven-year-old one that has never been touched.
If a replacement is the answer, the quote should cover more than the appliance: the connections, the shutoff valve, the expansion tank, the drain pan and the venting or electrical supply. Ask whether anything has to change to meet current requirements, because that is where surprises appear. If water has already reached the floor, see burst pipe repair for what to do about the supply line, and leak detection if you are not certain the heater is the source.
Questions for the Inspection
What would the repair actually fix?
Ask which part failed, how it was tested and what else was checked. A repair should address the cause, not just the symptom you reported.
What has the maintenance history been?
Ask whether the tank has been flushed and whether the anode rod has ever been replaced. On water this hard, those two facts explain most of a heater's condition.
What would a replacement involve?
Ask what changes beyond the unit — venting, connections, the pan, the expansion tank. Get it in writing before ordering anything.
If you want to know what happens on the visit itself, read how service works, check the communities we cover, or go through the common questions.
Arrange a water heater inspection
Tell us what the hot water is doing and we will plan the right visit.