How long does it take to replace a water heater?

• <div><p>The time it takes to replace a water heater depends on the complexity of the job. Expect your contractor to spend:</p><ul><li><p>One to three hours on a standard tank-style water heater replacement</p></li><li><p>Two to three hours on a tankless water heater replacement</p></li><li><p>Four to six hours replacing a tank-style water heater with a tankless water heater</p></li><li><p>One hour for each additional parallel or point-of-use water heater</p></li></ul><p>Your project will take longer if you’re switching fuel sources, upgrading to tankless, or relocating your water heater.</p></div>

Get matched with top water heater pros in Hannibal, MO

Q: Should I get a tankless water heater?

• <div><p>Tankless water heaters heat water as it passes through the unit instead of storing heated water in the tank. Their ability to produce hot water on an as-needed basis makes them more efficient. However, they are generally more expensive than traditional units. <a href="https://www.angi.com/articles/is-a-tankless-water-heater-worth-it.htm">Is a tankless water heater worth it</a>? Most homeowners will save money with a tankless unit in the long run by using less energy. </p></div>

Q: Are tankless water heaters better than traditional water heaters?

• <div><p>There are <a href="https://www.angi.com/articles/what-are-pros-and-cons-tankless-water-heaters.htm">pros and cons to tankless water heaters</a>. They are more efficient than traditional tank water heaters, and maintenance costs are lower. These units are also much more compact. On the other hand, they cost about twice as much to install as traditional tank water heaters and are more limited in terms of flow rate. </p></div>

Q: Can you use a boiler and a water heater interchangeably?

• <div><p>No. Boilers and water heaters are not interchangeable because they serve different purposes. A water heater will never be able to supply warm water or steam for your central heating system. In most homes, a boiler and a water heater may be combined to provide heating and daily use of hot water. Other homes may opt for a furnace over a boiler for their heating needs.</p></div>

Q: Do water heater installation laws change in different states?

• <div><p>Every city and state will have its own set of installation codes and laws. Some won&rsquo;t require you to obtain a permit before replacing your water heater, though we recommend you do, regardless of the local codes. On the other hand, some cities and states might require secondary permits for plumbing and electrical work related to the installation. Check with a <a href="https://www.angi.com/nearme/water-heater-installation/">local water heater installation company</a> and local building codes to confirm which permits are required and what the specific laws are.</p></div>

Enter your ZIP and get matched with up to 5 pros

Verified Reviews for Water Heater Service pros in Hannibal, MO

*The Angi rating for Water Heater Service companies in Hannibal, MO is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Water Heater Service needs.

*The HomeAdvisor rating for Water Heater Service companies in Hannibal, MO is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Water Heater Service needs.

Last update on November 17, 2025

Find Water heater pros in Hannibal

Neli Virtual Appliance Repair

Neli Virtual Appliance Repair

Customers say: Super punctual

30198 local quotes requested

9 years of experience

NEW! Appliance Consultation – Just $35 Get expert advice before you spend on repairs or replacements. A Neli technician will evaluate your issue and help you decide if your appliance can be fixed—or if it’s time for a new one. Virtual Appliance Diagnosis and Repair - Just $45 Service Description: Diagnose or repair your appliance virtually—no need for anyone to enter your home. Neli’s certified technicians guide you step-by-step via secure video chat. How It Works: Book online at nelihome.com or call 833-876-0900 Connect with a tech through our video platform Diagnose or fix the issue in real time Get expert advice and confidence in your next steps What’s Included: Real-time video guidance from a certified technician Diagnosis of the issue OR full repair (when possible) Step-by-step guidance using your smartphone or tablet Safe, contact-free service - no one in your home Flexible scheduling—appointments available daily Perfect For: Appliance fixes HVAC troubleshooting DIY-savvy homeowners Saving time and money on service calls

"Super helpful"

Michele H on November 2025

"Super helpful"

Michele H on November 2025

We are a Christian, non-smoking company that has been in business since 2001. We take pride in our work and it shows.

ALL-N-ALL CONSTRUCTION, LLC

5.00(

)

ALL-N-ALL CONSTRUCTION, LLC

5.00(

)

Recommended by 100% of Angi customers

Construction, remodeling, repairs as many people as needed, cash, check, money order and can accept cards for fee

Krell Distributing Co Inc

No reviews yet

Krell Distributing Co Inc

No reviews yet

53 years of experience

Additional DBA - Krell Industries. Family owned & operated. Nationwide service.

Solar Wolf Energy

2.00(

)

Solar Wolf Energy

2.00(

)

10 years of experience

Solar Wolf is a full service solar company with a great reputation and an old world belief to our customers. To under-promise and over-deliver, period. We have 18 years experience in construction, remodeling, roofing, solar water heaters, solar pv systems, battery back-up systems and much more. See what Solar Wolf Energy can do for you!

Call The All In One Construction Co

No reviews yet

Call The All In One Construction Co

No reviews yet

40 years of experience

I have 35 years experience in construction I have performed all phases of construction im a 4th generation contractor I have 4 employees

Advanced Plumbing & Septic Service

No reviews yet

Advanced Plumbing & Septic Service

No reviews yet

27 years of experience

Foundation to Roof

No reviews yet

Foundation to Roof

No reviews yet

26 years of experience

New or repair everything from foundation to roof, to pouring sidewalks and driveways, to painting, plumbing, home additions, garages, everything you can imagine.. We do it all

Showing 1-10 of 28

Water Heaters questions, answered by experts

The time it takes to replace a water heater depends on the complexity of the job. Expect your contractor to spend:

One to three hours on a standard tank-style water heater replacement
Two to three hours on a tankless water heater replacement
Four to six hours replacing a tank-style water heater with a tankless water heater
One hour for each additional parallel or point-of-use water heater

Your project will take longer if you’re switching fuel sources, upgrading to tankless, or relocating your water heater.

Tankless water heaters heat water as it passes through the unit instead of storing heated water in the tank. Their ability to produce hot water on an as-needed basis makes them more efficient. However, they are generally more expensive than traditional units. Is a tankless water heater worth it? Most homeowners will save money with a tankless unit in the long run by using less energy.

There are pros and cons to tankless water heaters. They are more efficient than traditional tank water heaters, and maintenance costs are lower. These units are also much more compact. On the other hand, they cost about twice as much to install as traditional tank water heaters and are more limited in terms of flow rate.

No. Boilers and water heaters are not interchangeable because they serve different purposes. A water heater will never be able to supply warm water or steam for your central heating system. In most homes, a boiler and a water heater may be combined to provide heating and daily use of hot water. Other homes may opt for a furnace over a boiler for their heating needs.

Every city and state will have its own set of installation codes and laws. Some won’t require you to obtain a permit before replacing your water heater, though we recommend you do, regardless of the local codes. On the other hand, some cities and states might require secondary permits for plumbing and electrical work related to the installation. Check with a local water heater installation company and local building codes to confirm which permits are required and what the specific laws are.

The Hannibal, MO homeowners’ guide to water heater services

From average costs to expert advice, get all the answers you need to get your job done.

See all articles

Scott Dylan Westerlund
•
May 28, 2025May 28, 2025
How Much Does a Water Heater Gas Valve Replacement Cost? [2025 Data]
Learn about the different factors that go into water heater gas valve replacement costs to see if you should DIY the project or call a pro.
Heather Ayer
•
Jun 11, 2025Jun 11, 2025
How Much Does Water Heater Replacement Cost? [2025 Data]
Looking to replace or upgrade your water heater? Use this water heater replacement cost guide to see what the work will cost and what factors affect your total.
Scott Dylan Westerlund
•
Jun 3, 2025Jun 3, 2025
How Much Does It Cost to Repair a Hot Water Heater? [2025 Data]
Running out of hot water too quickly or hearing strange noises when you call for hot water? Use this water heater repair cost guide to see what a fix will cost.
Mitchell Grant
•
Apr 22, 2025Apr 22, 2025
How Much Does It Cost to Install a Heat Pump Water Heater? [2025 Data]
Learn all the factors that influence the cost to install a heat pump water heater at your home.
Xiao Faria daCunha
•
May 2, 2025May 2, 2025
How to Replace a Water Heater Element in 8 Steps
If your showers are lukewarm, you could have a water heater issue. This guide explains how to replace a water heater element to solve the problem.
Kelly Reilly
•
May 1, 2025May 1, 2025
The Pros and Cons of Hybrid Water Heaters
Hybrid water heaters will have you weighing high initial costs versus long-term savings. Is it the right option for you? Explore the pros and cons of hybrid water heaters.