Your water heater is probably the hardest-working appliance in your home. It fires up dozens of times a day, 365 days a year. And unlike your furnace or AC, you never think about it until there's no hot water or there's water on the floor.
Spring is the best time to give it attention. You used it heavily all winter. Sediment built up. Components wore. Here's what matters and why.
Sediment Flush: The Single Most Important Thing
The water supply in the greater Philadelphia area carries dissolved minerals. Every time your water heater fires, those minerals settle to the bottom of the tank as sediment. Over a winter of heavy use, that layer gets thick.
What sediment does:
- Insulates the burner from the water. Your gas burner is trying to heat water through an inch of calcium and lime. It runs longer, uses more gas, and overheats the tank bottom.
- Causes popping and rumbling noises. That's steam bubbles escaping through the sediment layer. It sounds alarming because it is alarming.
- Accelerates tank corrosion. Hot spots on the tank bottom eat through the glass lining faster. This is the #1 cause of premature tank failure.
A proper flush drains the tank, clears the sediment, and adds years to your water heater's life.
Anode Rod Inspection
Every tank water heater has a sacrificial anode rod, a metal rod that corrodes so your tank doesn't. Once the anode rod is consumed, the tank starts corroding.
Bradford White uses their Vitraglas tank lining plus a magnesium anode rod. Their tanks are among the best-protected in the industry, but the anode rod still needs checking every 2-3 years. Bradford White's residential tanks are what we install most often because the build quality means fewer callbacks.
Rheem uses a similar setup. Their ProTerra and Professional series have good anode protection, but in hard water areas, rods can deplete faster than the 5-year warranty assumes.
AO Smith uses a combination anode rod in some models (built into the hot water outlet). These are harder to inspect and replace, which is why professional maintenance matters.
A new anode rod costs $30-60 in parts. A new water heater costs $1,950-3,000 installed. The math is obvious.
T&P Valve Test
The temperature and pressure relief valve is a safety device. If your water heater overheats or over-pressurizes, this valve opens to prevent an explosion. That's not an exaggeration.
During a spring checkup, we manually test the T&P valve to confirm it opens and reseats properly. A stuck valve is a safety hazard. A leaking valve needs replacement before it causes water damage.
This takes 30 seconds and could prevent a catastrophic failure.
Expansion Tank Check
If your home has a closed plumbing system (most homes with a backflow preventer do), you should have a thermal expansion tank. As water heats, it expands. With nowhere to go, pressure builds in the tank and the T&P valve starts dripping.
Expansion tanks have a rubber bladder that absorbs that pressure. Over time, the bladder fails and the tank fills with water, becoming useless. We check the air charge and function during every water heater maintenance visit.
Gas vs. Electric Considerations
Gas water heaters need their burner assembly and flame sensor inspected. A dirty flame sensor causes intermittent outages. A clogged burner causes uneven heating and carbon buildup. We check flue draft to make sure combustion gases are venting properly.
Electric water heaters need their heating elements and thermostats tested. Sediment buildup is worse on electric units because the lower element sits directly in the sediment layer. Spring flushes are even more critical.
How Long Should a Water Heater Last?
With proper maintenance: 10-15 years for a tank unit. Without maintenance: 6-8 years, and the failure mode is usually a flood.
A $250 annual maintenance visit protecting a $3,200 asset is the simplest math in home ownership.
McCorry Comfort installs and services water heaters across Philadelphia, Montgomery County, Bucks County, and Delaware County. Schedule your water heater maintenance.