Tank vs. Tankless Water Heater Flushes: Why They Are Important

Your water heater is one of the most essential appliances in your home, providing hot water for showers, washing dishes, laundry, and more. However, many homeowners overlook regular maintenance, which can lead to reduced efficiency, higher energy bills, and even premature failure.

Whether you have a traditional tank water heater or a tankless water heater, annual flushing is a crucial part of maintaining your system. At Mía’s Master Plumbing, we help homeowners in Surfside Beach, Myrtle Beach, Little River, Murrells Inlet, and all of Horry County, SC keep their water heaters running efficiently year after year.

Why Flushing Your Water Heater is Essential

Over time, sediment and mineral buildup accumulate inside water heaters, reducing performance and lifespan. Flushing your system annually helps:

• Improve efficiency – Sediment buildup forces the heater to work harder, using more energy.
• Extend the lifespan – Regular maintenance can prevent premature breakdowns.
• Ensure clean water – Flushing removes contaminants that could affect water quality.
• Prevent costly repairs – Avoid expensive fixes by maintaining your heater properly.

Flushing a Traditional Tank Water Heater

How Sediment Builds Up in Tank Water Heaters

Tank water heaters store and heat large amounts of water. As water enters the tank, minerals like calcium and magnesium settle at the bottom, forming a thick layer of sediment. Over time, this buildup:

• Reduces heating efficiency.
• Causes strange noises (popping or rumbling).
• Leads to overheating and potential tank failure.

How Often Should You Flush a Tank Water Heater?

At least once a year—more often if you live in an area with hard water.

Steps to Flush a Tank Water Heater

• Turn off the power – Switch off the gas or electricity supply to the heater.
• Shut off the cold water supply – Prevent new water from entering the tank.
• Connect a hose to the drain valve – Direct the water to a safe drainage area.
• Open the drain valve – Let the water (and sediment) flow out.
• Flush with cold water – Turn on the cold water supply to remove any remaining debris.
• Close the valve and refill – Once clear, close the drain valve and turn the heater back on.

Flushing a Tankless Water Heater

Why Tankless Water Heaters Need Flushing

Even though tankless water heaters don’t store water, they still accumulate mineral deposits inside the heat exchanger. This buildup can:

• Reduce heating efficiency, making it take longer to heat water.
• Cause blockages, restricting water flow.
• Trigger system errors, leading to unexpected shutdowns.

How Often Should You Flush a Tankless Water Heater?

At least once a year—more often in homes with hard water.

Steps to Flush a Tankless Water Heater

• Turn off the power – Shut down the electrical or gas supply.
• Close the water valves – Prevent new water from entering the system.
• Attach hoses to the flush ports – Use a descaling pump or bucket with a vinegar solution.
• Circulate the descaling solution – Let it run for 45-60 minutes to dissolve mineral buildup.
• Flush with clean water – Rinse out any remaining vinegar or cleaning solution.
• Restart the system – Restore power and open the water valves.

Which Water Heater Type is Best for You?

If you’re unsure which system is best for your home, Mía’s Master Plumbing can help you decide based on your budget and hot water needs.

Keep Your Water Heater Running Smoothly with Professional Maintenance

Regular flushing is the key to keeping your water heater in peak condition. If you need a professional water heater flush, repair, or replacement, Mía’s Master Plumbing is here to help.
We offer affordable, expert water heater maintenance for homes and businesses in Surfside Beach, Myrtle Beach, Little River, Murrells Inlet, and Horry County, SC.

Schedule your water heater flush today—contact us now!