A routine garbage disposal repair led to a much more dramatic warning for one homeowner.
They told the r/askaplumber subreddit that after checking the basement plumbing, a plumber said the water heater arrangement could "explode at any moment" and recommended about $1,000 in expansion tank work.
Here's what to know
Posting on Reddit, the homeowner said a visit for a garbage disposal fix took a turn when the plumber inspected the water heater and warned that the pipes weren't up to code and could pose a major hazard.
The plumber then proposed "a water heater expansion tank replacement for about $1k." The homeowner added that the setup had already been there for roughly four years before they bought the house and said other plumbers had seen it without raising the same alarm.
The response from commenters was largely doubtful, both about the urgency and the quote.
"Expansion tank install for $1k is ludicrous," one wrote.
Another added: "To break it down: you only need an expansion tank if there's a check valve between your supply and your house. And this is a 'forget code, you need it because of physics' need."
People in the thread also flagged other parts of the installation that might warrant attention, including the venting, SharkBite fittings, galvanized piping, and the temperature- and pressure-relief setup.
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Water heater problems can pose legitimate safety risks. If a major repair is really needed, it may make sense to compare the cost with the price of upgrading to a heat pump water heater, since it can reduce household energy use and lower utility bills over time.
More background
In this case, commenters said whether an expansion tank is necessary may depend on water pressure and on whether the home has a closed plumbing system.
The general vibe was that the original poster should get some work done to smooth out some of the setup's rough edges, but should not take the plumber at their word.
"The person before you installed this water heater themselves and they were not a professional," a user suggested. "Technically code is that it needs an expansion tank but in reality it's not a huge deal."
A system can be imperfect or not fully up to current code without necessarily being on the verge of exploding. Still, it may deserve a second opinion.
What can be done?
The homeowner said they would ask another plumber to inspect the system and explain, in plain terms, what is unsafe, what is merely outdated, and what each repair should cost.
If a water heater is older or multiple repairs are piling up, replacement may make more financial sense than continuing with patchwork fixes. That is where a heat pump water heater can stand out, since it can deliver hot water more efficiently than standard electric resistance models and lower energy bills over time.
For homeowners exploring that route, Cala offers smart heat pump water heaters designed to add more control to the upgrade. Its customizable smart heat pump water heaters help homeowners decrease their energy bills by heating water exactly when it's needed.
That can help reduce energy waste while still meeting a household's hot water needs. For people trying to turn an expensive repair moment into a longer-term savings opportunity, options like Cala may be worth considering.
Where can I learn more?
Water heater trouble can mean anything from a true safety hazard to a repair bill that makes replacement look like the better deal. These articles look at both sides of that equation, including what can go wrong and how rebates, warranties, and replacement costs can influence a heat pump upgrade.
• One homeowner was left traumatized after a faulty water heater blew up in their face.
• Across the US, homeowners can get $2,000 to replace aging water heaters.
• One GE customer saw warranty delays stretch the outage after a heat pump unit failed.
• A policy expert warned households to quickly collect $1,750 for new water heaters.
A warning like this is easier to evaluate with a little context. Looking at how other homeowners handled safety scares, breakdowns, and replacement decisions is another reminder that a second opinion or an upgrade can be worth it.
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