How to Flush a Water Heater - Greenwell Plumbing, Heating, Air

Over time, sediment can build up in your water heater, especially in hard water areas like Louisville and the surrounding Kentuckiana region. This can affect water quality, efficiency, and system lifespan. If you’re hearing strange noises or seeing rust-colored water, it may be time to flush the tank. Greenwell Plumbing helps local homeowners keep their systems clean and reliable.

How Long Does a Hot Water Heater Last?

Traditional gas water heaters last around 8 to 12 years. Tankless water heater systems can last up to 20 with proper care. High-efficiency models fall somewhere in between. Routine flushing is one of the best ways to extend your system’s life and avoid early breakdowns.

So, how long does a water heater last? That depends on the model, how often it’s maintained, and whether issues are addressed early.

Do I Need to Drain and Flush My Hot Water Heater?

If it’s been years since your last flush, now’s a good time to take action. Sediment from minerals in the water can collect at the bottom of the tank. When left alone, it can:

Reduce energy efficiency
Cause rumbling or banging noises
Lead to discolored or smelly water
Slow your hot water supply

Not flushing the tank can also shorten its lifespan. If you’re wondering how long a gas or tankless water heater lasts, regular maintenance makes a big difference.

What to Know Before You Start Flushing Your Water Heater

Before you begin, be sure to:

Turn off the power or set gas valves to “pilot.”
Close the water inlet valve.
Let the tank cool for at least two hours.
Connect a hose to the drain valve and run it to a safe drain or outdoors.
Gather basic tools like gloves, a screwdriver, and a wrench.

Being prepared helps the process go smoothly and keeps things safe.

How to Flush a Hot Water Heater

Flushing your water heater is a manageable DIY task if you follow each step carefully. Here’s how to flush a water heater tank:

Turn off the power or gas supply.
Shut off the cold water inlet valve.
Let the water cool for at least two hours.
Attach a hose to the drain valve at the bottom of the tank.
Open a hot water tap in your home to prevent suction.
Open the drain valve and let the water flow out completely.
Briefly reopen the cold water valve to stir up the remaining sediment, then drain again.
Close the drain valve, remove the hose, and shut off the tap.
Reopen the cold water inlet to refill the tank.
Restore power or relight the gas.

How long does it take to drain a water heater? Most tanks are empty in about 20 to 30 minutes, depending on size and sediment buildup.

What About Tankless or Gas Units?

What’s the difference in regular flushing maintenance in traditional tank vs tankless water heaters? If you’re wondering how to flush a tankless water heater, the process involves a descaling solution and a circulation pump. It’s best left to professionals unless you’re confident with the steps.

You’ll find similar nuances when it comes to gas vs electric water heaters. Knowing how to flush a gas water heater involves handling burners and fuel lines. If in doubt, or if your system hasn’t been flushed in years, it’s smart to call a pro.

Do I Need a New Water Heater?

Even with proper care, water heaters won’t last forever. Signs that it might be time to replace include:

Inconsistent hot water
Leaks around the base
Rust-colored water
Loud or persistent noises

Not sure if hot water heater repair or replacement is right? Greenwell Plumbing can inspect the unit, flush it if needed, and advise on whether new water heater installation is necessary.

Serving Homeowners Across Kentuckiana

Greenwell Plumbing serves Louisville, Columbus, IN, and nearby areas across Kentuckiana. We offer water heater maintenance, repair, and replacement to meet your home’s needs.

If you’re unsure how to flush a water heater, or prefer to leave it to the experts, we’re here to help. From flushing an electric water heater to answering whether you need hot water heater repair or replacement, we make the process simple and stress-free.

Don’t let sediment slow you down. Call Greenwell Plumbing today to schedule a water heater inspection or flush. We’re here to make sure you don’t end up in a situation where emergency water heater repair becomes necessary, and help your home stay comfortable all year long.