If you have never flushed your water heater, you are not alone. Most homeowners do not think about their water heater until it stops producing hot water or starts leaking. But in Central Texas — where hard water is a fact of life — sediment buildup is the single biggest threat to your water heater's lifespan and efficiency.
Why Flushing Matters
Central Texas water is hard. Depending on your area, hardness levels range from 15–25 grains per gallon. That mineral content — primarily calcium and magnesium — settles to the bottom of your water heater tank as the water is heated. Over months and years, this sediment layer builds up and creates serious problems.
Reduced efficiency. Sediment insulates the bottom of the tank from the burner (gas) or heating element (electric). The system has to work harder and run longer to heat the same amount of water. This directly increases your energy bill.
Rumbling and popping noises. Water trapped under the sediment layer boils and creates steam bubbles that rise through the sediment. This produces the rumbling, popping, or knocking sounds that many homeowners hear from their water heater. The noise itself is not dangerous, but it indicates significant sediment accumulation.
Shortened tank life. Sediment traps heat against the bottom of the tank, causing the steel to overheat and weaken. Over time this leads to hairline cracks, leaks, and eventually tank failure. A water heater that should last 10–12 years may fail in 6–8 years without flushing.
Reduced hot water capacity. A 50-gallon tank with 5 gallons of sediment in the bottom is effectively a 45-gallon tank. As sediment builds, you get less hot water per heating cycle.
How Often to Flush
In Central Texas: once per year minimum. Our hard water accelerates sediment buildup compared to areas with soft water. If you have particularly hard water (well water in rural areas like Giddings, Lexington, or Rockdale tends to be hardest), every 6 months is better.
If your water heater has never been flushed and is more than 3 years old, the first flush may not remove everything. Years of baked-on sediment can harden into a calcium plate that will not drain through the valve. In these cases, a professional can use a de-scaling solution or agitate the sediment manually.
How to Flush Your Water Heater (DIY)
Step 1: Turn the gas valve to PILOT (gas heater) or switch off the breaker (electric heater). Do not drain with the burner or element actively heating — you can damage the tank.
Step 2: Connect a garden hose to the drain valve at the bottom of the tank. Run the hose to a floor drain, utility sink, or outside.
Step 3: Open the drain valve. Also open a hot water faucet somewhere in the house to allow air into the system — this helps the tank drain faster.
Step 4: Let the water flow until it runs clear. The first few gallons will usually be cloudy or have visible sediment. Keep draining until the water is clear. This typically takes 5–10 minutes.
Step 5: Close the drain valve, remove the hose, and turn the gas back to ON or flip the breaker back. Let the tank refill completely before using hot water. The hot water faucet you opened will start flowing when the tank is full — close it at that point.
When to Call a Professional
Call a pro if: the drain valve will not open (common on old heaters), the water never runs clear, the valve leaks after closing, or your water heater is making loud noises even after flushing. Kimco membership includes annual water heater maintenance. Call (737) 260-7255 to schedule.