If you’re experiencing lukewarm showers, rising utility bills, or a unit that is past its prime, it might be time to consider replacing a water heater.
Whether your current system is failing or you’re ready for a more energy-efficient upgrade, knowing what to expect during a water heater replacement helps relieve the stress.
Many homeowners are unsure how long a replacement will take, what it involves, or how to prepare. So, if you’re asking yourself, “How long does it take to replace a water heater?” You’re in the right place.
The good news is that most installations are straightforward and can be completed in a matter of hours, especially with the right professional handling the job.
In this blog, we’ll discuss the typical timeline for a water heater replacement, explore the factors affecting the process, and share tips for making your installation day go smoothly.
Water heaters don’t last forever. Most traditional tank-style models have a lifespan of about eight to 12 years, while tankless systems may last up to 20 years with proper care. Once a unit reaches the end of its expected life or begins showing signs of failure, it’s time to consider a replacement.
One of the most common signs is inconsistent hot water. If your showers turn cold faster than they used to or the water temperature fluctuates, your heater could be losing efficiency.
Leaks around the tank's base are another red flag. Even a small leak can grow into a major issue, causing water damage or mold.
You might also notice discolored water — usually a rusty or muddy tint — coming from your taps. This often means the inside of the tank is corroding.
Strange noises, such as popping or rumbling, are usually caused by sediment buildup, which puts extra strain on the tank and shortens its life.
Sometimes, your water heater might still work but run inefficiently, causing your energy bills to climb. Older models aren’t as efficient as newer ones, especially those built to modern energy standards. Replacing an outdated unit with a more efficient model can improve performance and save money in the long run.
Whether due to age, leaks, poor performance, or high energy costs, replacing your water heater at the right time helps you avoid surprise breakdowns and ensures your home always has a steady, reliable supply of hot water.
Replacing a water heater is a fairly routine job for a licensed plumber. In most standard situations, the entire process takes about three to six hours. The exact timeline depends on the unit type, the existing system's condition, and any adjustments that need to be made during installation.
The process usually starts with disconnecting and draining the old unit, which can take 45 minutes to an hour. This step moves quickly if the unit is in good condition and easily accessible. However, it may take longer if you have corroded valves or the space is tight.
Once the old water heater is out of the way, the plumber will prep the area for the new installation. This can include inspecting connections, upgrading parts to meet current code, or making adjustments to fit a different-sized tank. This part typically takes another 30 to 60 minutes.
Installing the new water heater — including connecting water lines, venting (for gas units), and hooking up electrical or gas components — can take about 60 to 90 minutes. On the other hand, a tankless water heater installation may require more time due to additional work like reconfiguring piping or installing new ventilation.
After installation, your plumber will test the system, check for leaks, verify water temperature, and ensure everything is running safely and efficiently. Final cleanup usually adds another 30 minutes or so to the job.
A straightforward replacement of a similar-sized tank water heater can be completed in half a day. If complications arise or you’re upgrading to a tankless system, it could take longer, but the process is typically smooth and efficient with a professional on the job.
While replacing a water heater usually takes three to six hours, several factors can make the job go faster or slow it down. Here’s what can influence the overall timeline:
Installing a standard tank water heater is typically faster than upgrading to a tankless model. Tankless units require more extensive setup, including changes to venting, gas lines, or electrical connections. Expect a longer installation window if you’re switching types or fuel sources.
Gas water heaters may require extra time for venting and gas line adjustments. Electric models tend to be simpler but may still involve work at the breaker panel. If you need permits or code updates for either system, that adds time.
Tight utility closets, attic installations, or cramped basements can make it harder to remove the old unit and bring in the new one. If your plumber has to work around limited space, expect extra time for maneuvering and setup.
If the shut-off valves, water lines, or connections are corroded, broken, or outdated, your plumber will need to repair or replace them before moving forward. Unexpected issues like leaky fittings or damaged drain pans can also extend the process.
Some areas require permits or inspections before or after installation. Your plumber may need to bring your setup up to current building codes, especially in older homes. This might involve installing expansion tanks, seismic straps, or new venting materials.
If you’re adding enhancements like a drip pan, water alarm, pressure regulator, or recirculation pump, the installation will take longer. These upgrades offer great benefits but may add an hour or more to the total project time.
Every home is different, and no two installations are exactly the same. Understanding these variables helps set realistic expectations and ensures you're prepared for a smooth, stress-free replacement process.
When it’s time to replace your water heater, don’t leave it to chance. Trust the experts at Neighborly Plumbing for fast, reliable service and professional installation done right the first time. Whether you're upgrading to a more efficient model or replacing a failing unit, our team makes the process smooth, safe, and stress-free.
From helping you choose the right system to handling every detail of the installation, Neighborly Plumbing is your go-to for dependable water heater replacement. Contact Neighborly Plumbing today, and enjoy worry-free hot water in your home.
