If your 8-year-old water heater has never been flushed, it is generally best to leave it alone. Starting to flush a neglected older tank carries real risks.
For a 10-year-old water heater that has never been flushed, the best advice is often to leave it alone. Opening old, brittle valves can cause them to snap or fail to seal again. Since the tank is already at the end of its typical 8–12 year lifespan, any major sediment disturbance can trigger leaks.
You should never flush an older water heater (typically 5 to 10+ years old) that has never been flushed before. Accumulated sediment in old tanks can seal small rust holes or cracks; flushing this debris away can dislodge the seal and cause immediate leaks.
A: Traditional tank water heaters usually last 8–12 years, while tankless units often last 15–20+ years. Q: Should I replace my water heater if it's over 10 years old? A: Often yes. Even if it still works, the risk of leaks and sudden failure increases significantly after 10 years.
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.
No, it is highly recommended that you do not flush a 20-year-old water heater.
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.
Traditional tank water heaters last 8 to 12 years, while tankless models typically last 15 to 20 years. Lifespans vary greatly depending on water quality, unit design, and whether you perform regular maintenance like flushing the tank and checking the anode rod.
Signs a Water Heater is Going Bad
Common signs that sediment buildup is significant include bubbling and gurgling sounds and diminished hot water when bathing, cooking, or cleaning. You may also notice water discoloration, a leaking pressure relief valve, or cracks in the tank or its connections.
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.
In short, draining removes water. Flushing removes sediment, and that makes all the difference.
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.
Water heaters typically last about 10 years because the steel tanks constantly endure high heat, intense water pressure, and mineral corrosion. Over a decade, this continuous strain—along with neglect of internal protective parts—causes the tank to rust and eventually leak.
Here are some estimated labor cost price ranges for a water heater replacement: Tank-style water heater: $150 to $450. Tankless water heater: $600 to $1,900. Switching from tank-style to tankless: $150 to $2,500.
If you are looking to properly decommission, drain, or dismantle an old water heater for replacement, the process involves safely shutting off the power and water, completely draining the tank, and carefully disconnecting the plumbing.
Water leaks are perhaps the most common type of water heater issue you'll face. Any water heater will start to leak eventually, as by nature water will eventually corrode your tank and create microscopic cracks or fractures. However, this isn't always a sign that your tank is what's leaking.
A water heater generally needs to be replaced if it is leaking from the inner tank, is over 10 years old, or produces rusty water. Other warning signs include loud popping noises, fluctuating water temperatures, or a sudden drop in hot water capacity.
The longest-lasting water heater brands are Bradford White and Rheem (specifically the Marathon series). Bradford White is favored by plumbers for professional installations and longevity, while the Rheem Marathon uses a unique fiberglass tank backed by a true lifetime warranty.
How Age Determines If Water Heater Repair Is Worth It. Traditional tank water heaters last 8-12 years under normal conditions. Tankless units last 15-20 years but have higher repair costs when problems occur. Units over 10 years old with major problems should be replaced rather than repaired.
Excessive Water Pressure: High pressure stresses your system and shortens its lifespan. A pressure-reducing valve can help. Undersized System: A unit that's too small for your household's demand works harder and wears out faster. Proper sizing during installation is critical.
The 4-minute shower rule is a sustainability and cost-saving initiative advising people to limit their daily showers to four minutes or less. This practice helps conserve water, reduce energy used for heating, and lower household utility bills by limiting consumption to approximately 36–40 liters (roughly 9.6–10.5 gallons) per shower.
Some common causes of high water bills include:
When your hot water only lasts 15 minutes, it usually means your water heater is struggling to heat water fast enough or the hot water is mixing with cold water. The most common culprits are a broken dip tube, a faulty lower heating element (on electric tanks), or excessive sediment buildup.