Welcome to Domestic Disasters, where we examine some of the worst household mishaps and the grossest finds, then consult experts to assess how serious they are and what they cost to fix.
Last month, after filling the bathtub for his young daughter, Ethan discovered the water wasn’t hot. When he opened the utility closet to investigate, he found a puddle covering most of the floor.
Handy with household DIY tasks, he immediately suspected the culprit: the water heater tank had rusted through. The only practical remedy was to install a new water heater.
What They Tried
Ethan’s first priority was to close the supply line valve to stop the tank from refilling. Before heading to the home improvement store for a replacement, he connected a hose to the drain spigot at the bottom of the tank to empty the remaining water.
He expected the tank to be drained by the time he returned, but water was still flowing. That indicated the supply line valve wasn’t sealing, so the only option left was to shut off the main water to the house.
The next morning he installed the new heater, then enlisted his father-in-law to carry the old unit up the stairs. Because the tank weighed more than 120 pounds, moving it was the hardest part, and it got messy — water leaked out despite their attempts to contain it with plastic.
“If there’s a silver lining here, it’s that we were home when this happened,” Ethan says.
Ethan is confident with DIY projects, but did he handle the situation correctly? And could the disaster have been prevented?
A Pro Weighs In On What Went Wrong
Water heaters running on gas or propane typically last 10 to 15 years before corrosion becomes a problem. Ethan’s tank was 21 years old, so failure wasn’t surprising to the plumbers we consulted. Cold climates, where heaters run longer to meet household demand, can accelerate wear, and Ethan lives in Minnesota, which likely contributed.
The faulty valve is often caused by degraded gaskets or mineral buildup that prevents it from closing. “It’s actually pretty common on water heaters that are older than ten years,” says plumber Travis Hargrave.
Did the Homeowners Get it Right?
Mostly. Once Ethan realized the supply valve wouldn’t close, shutting off the main water was the correct and necessary move. “That’s your only move, and hesitating even 10 minutes can mean hundreds of gallons on the floor,” says plumber Brendan Tonks.
Ethan also got lucky. His home is a 1940s bungalow, and many older houses use gate-style shutoff valves rather than modern ball valves. Gate valves and old supply valves are both vulnerable to buildup and corrosion that can prevent them from closing properly.
Where Ethan fell short was not replacing an aging water heater before it failed. It would also have been prudent to install a water-leak monitoring device that can automatically shut off the water in an emergency. “These devices aren’t a requirement years ago, but now that they’re available, not having one is a missed opportunity to prevent catastrophic or slow leaks,” says plumber Kolby Barnes.
What a Pro Would Have Done Differently
All the plumbers interviewed agreed on a critical safety step Ethan missed: turn off the gas or electricity to the water heater before touching plumbing or attempting removal. That prevents the risk of electrocution, gas leaks, fire, or other hazards. In extreme cases, a tank that’s heating while empty can present additional danger.
The Panic Meter
We rate Domestic Disasters on a four-level scale:
- Do It Yourself: Simple fixes you can handle alone.
- Phone a Friend: Tasks that may require some outside help.
- Call a Pro: Situations that warrant professional expertise.
- SOS: Dangerous problems with immediate risk of injury or worse.
Deciding whether to DIY a water heater replacement depends on your skill level and comfort with gas and electrical systems. “I don’t recommend DIY for most people because water heaters involve gas and electrical components that can be dangerous if not handled correctly,” Tonks cautions.
Ethan, however, found the job straightforward: with a helper to move the old and new units, he says it took about two to two-and-a-half hours, half of which was cleanup. Using push-fit connectors like shark bite fittings can simplify plumbing connections for experienced DIYers.
The Cost Differential
You can extend a tank heater’s life by replacing the anode rod every few years. As a DIY job, an anode rod replacement usually costs $20 to $50 in parts; hiring a pro runs roughly $150 to $600. Replacing a faulty valve typically has similar cost ranges.
If a full heater replacement is required, DIY costs for materials can be around $700, while hiring a professional typically ranges from $1,500 to $3,500 depending on the model and local labor rates.
Be aware that unnoticed leaks can cause flood damage, structural repairs, and mold remediation that may cost thousands to tens of thousands of dollars if not addressed promptly.
How to Fix Water Heater Problems the Right Way
Before entering the utility area, turn off the power supply or gas to the water heater to eliminate electrocution and fire risks. Then proceed with these steps:
- Turn off your home’s main water supply.
- Drain the tank completely using a hose and a safe drainage point.
- For valve issues, remove the old valve and install a new one; leave it closed until you’re ready to test, and avoid over-tightening.
- Install the replacement water heater according to manufacturer instructions.
- If the heater is gas, test connections for leaks using soapy water.
- Turn the home water supply back on and check all connections for leaks.
- Open the new heater’s valve and fill the tank, using the pressure-relief valve to purge trapped air while filling.
- Run faucets to remove air pockets and ensure the tank is full before restoring power or gas.
- Re-enable electricity or gas only after confirming there are no water or gas leaks and following the manufacturer’s safety instructions.
How to Prevent Water Heater Problems
- Operate the supply line valve every six months to prevent mineral buildup.
- Replace the anode rod every three to five years to slow corrosion.
- Know the location of your main shutoff and inspect it annually for proper sealing.
- Replace older gate valves with ball valves for more reliable shutoff.
- Plan to replace tank-style heaters every 10 to 15 years, sooner if you have hard water or live in a cold climate.
- Install a leak-detection and automatic shutoff device to prevent extensive damage from both sudden and slow leaks.
- If your home lacks a floor drain under the heater, add a drain pan and route it to a safe drainage point.
Ethan also notes one more practical tip: some newer energy-efficient gas models require an electrical outlet for ignition or controls. If you’re planning a replacement or an upgrade to a different fuel type or tankless system, allow time to address space, venting, or electrical upgrades before the old unit fails.
What the Homeowner Learned
“It’s definitely approachable as a DIY job,” Ethan says. “You don’t need a lot of specialized tools, but get a helper — you’ll need the muscle to move the tanks and to minimize how much water ends up on your floor.”
When asked whether he’ll replace the new heater preemptively in 10 or 15 years, Ethan admits he tends to wait until something breaks. “I just hope it doesn’t happen while I’m on vacation,” he says.
About the Experts
- Kolby Barnes — second-generation plumber, service technician, and plumbing trainer manager at Service Force Plumbing in Maryland.
- Travis Hargrave — more than 30 years of plumbing experience, operator of Hargrave’s Plumbing in Louisiana.
- Brendan Tonks — licensed plumber and gasfitter, director at Steve Bennett Plumbing in Australia.
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