Water Heater Repair in San Antonio, TX

That sound is water trapped under a layer of hard-water sediment flashing to steam as the burner or element heats it. San Antonio tanks collect that layer faster than most because the aquifer water is so mineral-heavy. It is not an explosion risk in itself; the relief valve is there for pressure. But it is a sign the heater is working much harder than it should, and a gas tank that overheats its bottom for years can weaken the steel. If the heater is only a few years old, a thorough flush usually quiets it. If it has been rumbling for a long time, we will check the tank condition and tell you honestly whether a flush is money well spent.

Once a year is the practical answer here. Manufacturers often say every one to three years, but that assumes average water, and San Antonio water is not average. An annual flush drains the sediment before it hardens into a layer, and it is also when we check the anode rod, which corrodes faster in hard water. Care Club members get a whole-home plumbing safety inspection every year, and the water heater is a big part of it. If you have a water softener, the sediment slows dramatically, and the flush becomes a quick check rather than a chore. Details are on our water heater maintenance page.

Considerably. A garage heater leaks onto concrete. An attic heater leaks onto the ceiling of a bedroom, and by the time you see the stain, the insulation and drywall have been wet for a while. Attic units in the newer north-side and northeast-side subdivisions should have a drain pan piped to the outside and, ideally, a leak sensor that shuts the water off. If yours has a pan with no drain line, or a drain line that ends somewhere you cannot see, that is worth fixing before the tank ages. If you notice a drip from the eave or a water stain on a ceiling under the attic, shut off the cold supply valve on top of the heater and call.

Sometimes, and we will tell you which time this is. A ten-year-old tank in this water has usually lost its anode rod and has a sediment layer on the bottom, so it is closer to the end of its life than the same heater would be in a softer-water city. If the failure is a thermocouple, an element or a relief valve, the repair is inexpensive and buys real time. If the tank is leaking from a seam, rusting the hot water, or has needed more than one repair in the last couple of years, the money goes further toward a replacement. You will get both numbers in writing and the choice is yours.

The usual cause is a thermocouple that has worn out and no longer holds the gas valve open, which is a straightforward repair. In a San Antonio garage there are a couple of local twists. Dust, lint from a nearby dryer and a summer of open garage doors clog the burner screen and the air intake, and a starved flame will drop out. Newer sealed-combustion heaters have a flame arrestor screen that needs cleaning for the same reason. Finally, a garage that gets a hard draft under the door can blow out an older open-combustion pilot. We clean the assembly, replace the thermocouple if it tests weak, and check the gas valve before calling it fixed.