A conflicting repair quote can turn a routine water-heater fix into an expensive guessing game for homeowners.
That is what happened when one homeowner was told a larger expansion tank would require extra pipe work and wall strapping, only for a second plumber to describe it as an "easy swap."
Here's what to know
In a post on Reddit's r/askaplumber, a homeowner said they were quoted $500 to replace a rusted, undersized 2-gallon expansion tank with a 5-gallon model on an 80-gallon water heater.
The plumber quoted $500 because "there was no room for a 5 gallon and they'd have to add some pipe extensions and strap it to the wall."
Using a contractor through a home warranty led to a very different assessment.
The original poster wrote: "The guy the warranty contracts through comes out and tells me it's an easy swap. There is room for the 5 gallon and its brass fittings, so no need to strap it to a wall. Thinks I was being unnecessarily upsold."
Once the work was completed, the homeowner asked: "Does the install look good, or should I be concerned?"
Most replies said the replacement itself appeared acceptable, but several focused on the need to support the tank's weight.
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"That's perfectly fine but you need to support that arm holding the expansion tank. Lots of dead weight on the end of that pipe," one commenter wrote.
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More background
When a contractor bases a higher quote on the claim that a part will not fit, another inspection may reveal a simpler path — but that does not automatically mean every concern in the first quote was unfounded.
Readers said the central question was less about whether the 5-gallon tank fit in the space and more about whether the pipe should carry that load once the tank is full.
"Yeah, this install is fine. But the other guys weren't wrong about it needing to be strapped. It's supposed to be strapped by code. However, realistically it will be fine like this," one Reddit user wrote.
Another commenter explained: "Backflow preventers were mandated by the Safe Drinking Water Act of 1974. These are check valves that turn downstream plumbing into closed systems. Which is why expansion tanks are needed."
What can be done?
When you get sharply different plumbing opinions, ask each contractor to put their reasoning on sizing, support, and code issues in writing.
It also helps to seek at least three quotes when possible and to ask which parts of the job are essential for safety versus convenience or appearance.
If your water heater is aging anyway, a repair visit can be a good time to compare replacement options instead of defaulting to the same technology.
The overall takeaway from commenters was that the warranty plumber may have been correct that the larger tank fit, while the first company's warning about support was still valid.
One commenter said: "I'd support the tank arm."
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Where can I learn more?
Plumbing quote disputes often hinge on the same issues raised here: whether a repair is as simple as it sounds, when a second opinion is worth getting, and how minor household problems can turn into higher costs. The articles below dig into those questions through sink and toilet fixes, along with easy ways to cut water and energy waste at home.
• Homeowners sometimes found an easy fix for a leaky sink before paying another plumber.
• A simple hack to keep your toilet from overflowing spared some households an emergency call.
• Some homeowners used a simple blue-dye test to spot silent toilet leaks inflating bills.
• Elsewhere, homeowners made super simple switches that shaved hundreds of dollars off utility bills.
A little plumbing know-how can save money, especially when it's paired with a second opinion. That's worth keeping in mind when a repair sounds simple; the fine points can still change the price.
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