Flushing your hot water tank every 1 to 2 years removes sediment, prevents corrosion, and prolongs the lifespan of your unit. Always allow the water to cool for a few hours before starting.
Yes, you can absolutely flush your hot water heater yourself! It is a manageable DIY project that takes about 1 to 2 hours and helps remove sediment buildup, which ultimately extends the lifespan of your tank.
Yes, you should flush your water heater. Experts typically recommend flushing it once a year to clear out sediment and mineral buildup, which improves heating efficiency, lowers energy bills, and extends the tank's lifespan. However, if your tank is over 4–5 years old and has never been flushed, you generally shouldn't start.
How to Flush a Tank Water Heater
You can tell your hot water heater is full of sediment by listening for unusual popping or rumbling sounds, noticing a drop in hot water volume, or experiencing fluctuating water temperatures.
Your average water heater flush cost falls around $160, with most prices ranging from $110 to $200 depending on several factors. If your water heater sounds like a new garage band's drum solo and is accompanied by lukewarm temps, it's probably time to flush your water heater.
Your water heater likely needs a flush if you hear loud popping, banging, or rumbling noises, notice your hot water runs out faster than it used to, experience inconsistent temperatures, or see cloudy, metallic, or rusty water from your taps.
Water main flushing is the process of cleaning the interior of water mains and removing any accumulated sediment by sending a rapid flow of water through the mains. This rapid flow disrupts any sediment that may accumulate in the main over time, allowing us to filter and remove it.
If a standard showerhead is fitted, it will use around an extra half a gallon each minute, accounting for a 25-gallon emittance every 10 minutes, or 50 gallons throughout a 20-minute shower. *1 gallon = 4.54 litres.
If your 5-year-old water heater has never been flushed, you should proceed with caution. While some experts recommend an annual flush to remove sediment, flushing an older, neglected tank can dislodge large chunks of mineral buildup, which may clog the drain valve or open up micro-leaks.
Understanding the value of scrap water heaters can significantly impact your bottom line. With steel prices ranging from $0.05–$0.08 per pound, a standard residential tank can yield $10–$25. Larger commercial units may bring in $50 or more. Staying informed about market fluctuations is crucial for accurate estimates.
In short, draining removes water. Flushing removes sediment, and that makes all the difference.
If the gas burner or electric heating elements come on during the flushing process, the water heater can be damaged, requiring repair or replacement. Some manufacturers will recommend turning the gas off completely during this process, others may recommend setting the gas valve to the “pilot” or “vacation” setting.
Flushing a 40-gallon water heater typically takes 30 minutes to 1.5 hours from start to finish. Draining the tank takes about 10–20 minutes, while the actual flushing (agitating and rinsing out sediment) and refilling the tank take up the rest of the time.
Flushing your water heater too frequently (more than once or twice a year) wastes time and water. Worse, if you flush an older, unmaintained tank, you risk dislodging sediment that is sealing tiny pinhole leaks, causing the tank to leak or breaking brittle drain valves.
You can tell your hot water heater is full of sediment by listening for unusual popping or rumbling sounds, noticing a drop in hot water volume, or experiencing fluctuating water temperatures.
The "135-degree rule" in plumbing states that the total (aggregate) horizontal change in direction for a drainage pipe—specifically trap arms—cannot exceed 135 degrees between the P-trap and the vent. Exceeding 135 degrees (such as using three 45-degree bends or a 90 and two 45s) requires a cleanout because sharp turns hinder flow and cause clogs.
Flushing is usually commenced two weeks before harvest. If the plant has an eight-week flowering period, the flushing will need to take place six weeks after the start of the flowering stage. It is best to take a close look at the trichomes on your plant to assess when your cannabis is likely to be ready for harvest.
Skipping water heater flushes allows minerals and sediment to accumulate at the bottom of the tank. Over time, this buildup reduces hot water capacity, decreases heating efficiency, causes noisy popping sounds, and can lead to severe corrosion. In worst-case scenarios, sediment can clog vital safety valves and cause premature tank failure or leaks.
It takes about 30 minutes to 60 minutes to flush the water mains on each street.
Cost Factors for Flushing a Water Heater
The cost for a professional flush of your water heater typically ranges from $80 to $150. This service includes a comprehensive evaluation by our skilled technicians, who will ensure that every component of your water heater is functioning perfectly.
A 10-minute shower typically uses 12 to 25 gallons of hot water, depending on your showerhead's flow rate and how hot you keep the water.
Flushing an older unit that's never been serviced can lead to complications, including leaks or valve clogs. However, if your water heater is relatively new—or you've flushed it yearly since installation—you can enjoy the benefits of faster heating, lower energy bills, and a longer lifespan for your unit.
Simple Ways to Prevent Sediment Buildup