How Long Does Water Heater Replacement Take?

When your water heater fails, you don’t just want it fixed—you want to know how long your home will be without hot water and how to plan your day. The good news: for many homes, water heater replacement is often a same-day job.

Dyson Plumbing has served Mobile since 1952, and we replace water heaters across Mobile Bay and Baldwin County every week. Here’s the realistic timeline, what can slow things down, and how to make the process smoother.

Typical Water Heater Replacement Time

For many standard tank replacements (gas or electric), the job can often be completed in a few hours. That includes:

• disconnecting and removing the old unit
• setting and connecting the new unit
• filling, purging air, and bringing the heater up to temperature
• safety and leak testing

That’s the “normal” scenario.

What Can Add Time to a Replacement?

Some jobs take longer—not because anyone is dragging their feet, but because the system needs to be installed safely and properly.

1) Tight spaces or difficult access

Water heaters in closets, small utility rooms, attic spaces, or tight mechanical rooms can take longer simply because work has to be done carefully.

2) Venting changes (gas units)

Gas water heaters require safe venting. If the venting is damaged, corroded, improperly sized, or not up to current standards, adjustments may be required.

3) Code-related safety updates

Depending on your setup, you may need items such as:

• drain pan and proper drain routing
• expansion tank
• shutoff improvements
• relief valve discharge piping updates

These aren’t “upsells.” They’re often safety and best-practice items that help prevent leaks, pressure issues, and future headaches.

4) Piping modifications

Sometimes the new unit doesn’t line up perfectly with existing connections (especially if the old installation was non-standard). Small piping changes are common and can add time.

5) Switching to tankless

A tankless upgrade can add time if gas line sizing or venting changes are needed.

What Happens During the Replacement (Step-by-Step)

Here’s a simple overview of what we do:

1. Confirm type and size (gas/electric, capacity needs)
2. Shut down the system safely
3. Drain and remove the old unit
4. Set and install the new heater
5. Connect water lines, gas/electric
6. Verify safety components (relief valve, venting)
7. Fill, purge air, test for leaks
8. Bring the unit to temperature and verify performance

How to Help the Replacement Go Smoothly

If you want the fastest, cleanest replacement, a few simple steps help:

• Clear the area around the water heater
• Take a photo of the heater label (if you can)
• Know whether you have gas or electric
• Let us know if the heater is in a tight closet, attic, or crawlspace

What You Should Expect When It’s Done

A proper replacement ends with testing:

• no leaks at connections
• safe venting (gas)
• correct water temperature and stable performance
• a quick explanation of what was installed and what to watch for

Bottom Line

Most standard water heater replacements are often completed in a few hours. If access, venting, or code updates are involved, it can take longer—but the goal is always the same: safe, reliable hot water you can count on.

Eastern Shore

Repair or Replace Your Water Heater? A Simple Mobile Bay Checklist

If your water heater is acting up, you’re probably asking the same question every homeowner asks: Can we fix it, or is it time to replace it? The honest answer is that it depends—on age, symptoms, and (most importantly) whether the tank itself is still in good condition.

Dyson Plumbing has served the Mobile Bay region since 1952. We’ve repaired and replaced thousands of water heaters across Mobile, Fairhope, Daphne, Spanish Fort, Point Clear, and Baldwin County, and we’ve learned something simple: most water heater decisions become obvious once you know what to look for.

This guide breaks it down in plain language so you can make the right call—and avoid wasting money on repeat repairs.

Start Here: Is the Tank Leaking or Not?

This is the biggest divider.

If the tank itself is leaking

A leaking tank usually means replacement. Once the tank is compromised, repairs don’t “un-leak” steel that’s corroded through. At that point, you’re often deciding how quickly you want to replace it before the leak becomes water damage.

If it’s leaking from a fitting or valve

That can sometimes be repaired. A leak at a connection, temperature/pressure relief valve, or other external component can often be addressed—assuming the tank is still sound.
If you’re unsure where the leak is coming from, it’s worth having it checked quickly.

When Water Heater Repair Makes Sense

Repair is usually the smart option when the problem is component-based, the tank is in good condition, and you haven’t been stuck in a cycle of repairs.
Common repairable issues include:

• Electric: failed heating element, faulty thermostat, wiring issues, breaker-related problems
• Gas: pilot/ignition issues, thermocouple problems, gas control valve concerns
• General: minor connection leaks, failing drain valve, temperature issues

Signs repair is the right move

• The unit is relatively young
• The tank is not leaking or rusted through
• The problem appeared suddenly and is isolated
• You haven’t had multiple repairs in the last year
• Hot water performance returns after repair and testing

When it’s repairable, we focus on restoring consistent, reliable hot water—not just “getting it running” for the moment.

When Water Heater Replacement Is the Better Investment

Replacement is usually the smarter move when you’re dealing with tank failure, ongoing issues, or efficiency loss that’s costing you money over time.

Signs replacement is the right move

• The tank is leaking (especially around the base)
• Rusty/discolored hot water and an older unit
• Frequent breakdowns or repeated repairs
• Hot water runs out quickly despite repairs
• Loud popping/rumbling sounds from heavy sediment buildup
• The unit is older and performance is declining

Here’s the truth: a water heater can “work” while still being on the verge of failure. If you’re seeing multiple warning signs, the best move is often replacing it before it becomes an emergency.

The “Money Question” That Saves Homeowners the Most

When we talk with homeowners, we ask one simple question:

If you repair it today, do you trust it to last the next 12 months without another major call?

If the answer is no, replacement is usually the better long-term decision—even if repair is technically possible.

Why Mobile Bay Homes Often Have Unique Water Heater Problems

Plumbing is local. Coastal conditions and water quality can affect water heater lifespan and performance.

Across Mobile and Baldwin County, we commonly see:

• Mineral buildup that reduces efficiency and creates popping noises
• Corrosion that accelerates wear on fittings, vents, and connections
• Older home setups that may require small safety/code-related updates during replacement

That doesn’t mean every water heater fails early—but it does mean the “little signs” can become big problems faster if ignored.

Repair vs Replace Scenarios (Real-World Examples)

Scenario 1: “No hot water, but no leaks”

Often repairable. Electric elements and thermostats fail. Gas igniters and pilot issues happen. If the tank is sound, repair is usually smart.

Scenario 2: “Leaking at the bottom”

Often replacement. If the tank is leaking, that’s a structural failure.

Scenario 3: “Rusty hot water and it’s older”

Could be internal corrosion. Replacement becomes more likely, especially if other symptoms exist.

Scenario 4: “Popping noises + hot water runs out fast”

Often sediment buildup. Sometimes flushing helps. If the unit is older or already struggling, replacement may be the wiser investment.

What to Do If Your Water Heater Is Leaking Right Now

If it’s safe:

• Shut off the cold water supply valve to the water heater
• If you have gas and smell gas, leave the area and contact your gas provider
• Call for service before the leak worsens

Leaks can cause major damage fast. Even a “small leak” can become a big mess.

Bottom Line

• If it’s a component issue and the tank is sound: repair often makes sense
• If the tank is leaking or the unit is breaking down repeatedly: replacement is usually smarter
• If you want a modern upgrade and your home supports it: tankless may be worth considering

What Our Customers Say About Dyson Plumbing

Choosing a plumber means trusting someone with your home or business. At Dyson Plumbing, we’re proud of the long-lasting relationships we’ve built with customers throughout Mobile, Alabama and Baldwin County.

Our customers consistently choose us for our honesty, professionalism, and fast response times—and their reviews reflect that commitment.

Real Reviews from Local Customers

Homeowners and businesses trust Dyson Plumbing for:

• Prompt arrival and clear communication
• Honest pricing and recommendations
• Quality workmanship that lasts
• Respect for homes and properties

“Fast, professional, and honest. The plumber explained everything clearly and fixed the problem the same day.”
— Mobile, AL homeowner

“We’ve used Dyson Plumbing for years. They’re reliable, fair, and always do excellent work.”
— Local business owner

📍 Serving Mobile, AL and surrounding communities

Frequently Asked Questions

How quickly can a plumber arrive in Mobile, AL?

We offer same-day service and emergency response 24/7. Arrival time depends on call volume and location, but we prioritize urgent issues.

Do you provide free estimates?

We provide clear, upfront pricing after diagnosing the problem, so you know what to expect before work begins.

Are your plumbers licensed and insured?

Yes. All of our plumbers are fully licensed, trained, and insured for your peace of mind.

Do you handle plumbing emergencies after hours?

Absolutely. We are a 24-hour plumber in Mobile, AL, available nights, weekends, and holidays.