When it comes to installing a tankless water heater, safety is the top priority. These high-efficiency units often require careful handling of gas lines, high-voltage electrical circuits, and specific ventilation systems to prevent risks like carbon monoxide leaks. This isn’t a task for a general handyman; it demands the expertise of a trained professional. A licensed plumber understands the technical nuances and local Southern California codes required for a safe and compliant installation. This article breaks down the critical safety reasons for hiring certified tankless water heater plumbers, helping you understand the risks of an improper setup and giving you the confidence that your home and family are protected.
Key Takeaways
- Protect Your Investment with Professional Installation: A tankless water heater’s performance hinges on a flawless setup. Trusting a licensed plumber ensures your unit is installed safely, meets all local codes, and keeps your manufacturer’s warranty fully intact.
- Prioritize Annual Maintenance for Peak Efficiency: Simple yearly care, especially descaling to combat Southern California’s hard water, is the key to a long and efficient lifespan. This preventative step protects your heater from premature failure and helps keep your energy bills low.
- Address Warning Signs Early to Prevent Costly Repairs: Don’t ignore issues like inconsistent temperatures or a sudden drop in water pressure. These are often early indicators of bigger problems, and calling a professional right away can save you from a much more expensive fix down the road.
Why Hire a Professional for Your Tankless Water Heater?
Switching to a tankless water heater is a smart move for energy efficiency and endless hot water. But when it comes to installation, this isn’t your average weekend DIY project. These systems are more complex than traditional tank heaters, often involving intricate gas lines, high-voltage electrical connections, and specific venting requirements. While you might be tempted to save a few dollars by tackling the installation yourself, the risks far outweigh the rewards. A professional plumber not only has the right tools and training but also understands the nuances of these modern systems.
Hiring an expert ensures your new heater runs safely and efficiently for years to come, giving you total peace of mind. From selecting the right size unit for your family’s needs to navigating complex local building codes, a professional handles every detail. They prevent the costly mistakes that can arise from a DIY attempt, protect your manufacturer’s warranty, and guarantee that your significant investment is installed for optimal performance. It’s the difference between simply having a new appliance and having a reliable, long-term solution for your home’s hot water.
Ensure Safety and Code Compliance
First and foremost, professional installation is about safety. Tankless water heaters, especially gas models, require precise connections to fuel and ventilation lines. A small mistake can lead to dangerous gas leaks or carbon monoxide exposure. A licensed plumber knows exactly how to handle these connections safely and in accordance with local Southern California building codes. They’ll make sure your unit is vented correctly and all safety features are functioning properly. Hiring a licensed professional ensures your installation is done right, providing you with the safety and reliability you need to rest easy knowing your home and family are protected.
Get the Right Size and a Perfect Installation
Getting the most out of your tankless water heater starts with choosing the right unit for your home. A professional will assess your household’s hot water needs, calculating the correct size and flow rate to ensure you never run out, even when the dishwasher and shower are running at the same time. The installation itself can be complex and may require changes to your home’s pipes or electrical system. An experienced plumber can handle these modifications seamlessly, from upgrading gas lines to reconfiguring your plumbing. This expert touch guarantees your heater is installed perfectly for optimal performance and efficiency from day one.
Protect Your Warranty
Your new tankless water heater is a significant investment, and its warranty is there to protect it. However, most manufacturers specify that their units must be installed by a licensed plumber for the warranty to be valid. If you install it yourself and something goes wrong, you could be on the hook for the full cost of repairs or a replacement unit. Furthermore, licensed plumbers carry liability insurance, which offers an extra layer of protection in case of accidental property damage during the installation. Hiring a professional isn’t just about getting the job done right—it’s about safeguarding your investment for the long haul.
Avoid Expensive DIY Mistakes
Trying to install a tankless water heater yourself can quickly turn into a costly lesson. Common DIY mistakes—like using the wrong size gas line, incorrect venting, or damaging sensitive electronic components—can lead to poor performance or even complete system failure. The cost of fixing these errors often far exceeds what you would have paid for a professional installation in the first place. Instead of risking damage to your new appliance or your home’s plumbing system, it’s always best to trust an expert. If you’re ready to make the switch, you can schedule service with a qualified team that can handle the job correctly and efficiently.
What to Look for in a Tankless Water Heater Plumber
Choosing a plumber for your tankless water heater is a bigger decision than you might think. These units are more complex than traditional tank heaters, and a proper installation is key to their efficiency and longevity. The right professional will make sure your system is sized correctly and installed according to code, protecting your investment and ensuring you have reliable hot water for years. The wrong one, however, can lead to poor performance, a voided warranty, and even safety hazards.
So, how do you find a plumber you can trust? It comes down to looking for a few key qualifications that separate the experts from the rest. Taking the time to vet your options will give you peace of mind and a perfectly functioning system.
Proper Licensing and Certifications
A valid license is the absolute minimum requirement for any plumber you consider hiring. It’s not just a piece of paper; it’s proof that they have completed the necessary training and have the knowledge to handle complex plumbing systems safely and effectively. This is especially critical for tankless water heaters, which often involve intricate gas or electrical work. An unlicensed plumber might offer a lower price, but the risks aren’t worth it. A licensed professional will ensure the work is done to code, keeping your home and family safe. Always ask for their license number and confirm it’s current.
Proven Experience with Tankless Systems
Not all plumbers specialize in tankless technology. These systems have unique installation and maintenance needs that differ greatly from traditional water heaters. You’ll want a plumber who has specific training and a proven track record with tankless units. Ask them directly about their experience—how many they’ve installed, which brands they work with, and if they can provide references. An experienced plumber will understand the nuances of proper venting, gas line sizing, and water flow requirements, ensuring your unit operates at peak efficiency from day one. This specialized expertise is what prevents common issues down the road.
Full Insurance and Bonding
Think of this as your financial safety net. A reputable plumber will always carry full insurance, including general liability and workers’ compensation. This protects you from any liability if an accident or property damage occurs during the job. Bonding provides an additional layer of security, protecting you financially if the plumber fails to complete the work as agreed. When you choose a licensed plumber who is fully insured and bonded, it’s a clear sign that they are a serious professional who stands behind their work. Don’t hesitate to ask for proof of their coverage before work begins.
Positive Customer Reviews
In the age of the internet, you have a wealth of information at your fingertips. Before making a decision, spend some time reading online reviews from past customers. Websites like Google and Yelp can offer valuable insight into a plumber’s reliability, professionalism, and the quality of their work. Look specifically for feedback related to tankless water heater services. While one or two negative comments might not be a deal-breaker, a pattern of poor reviews is a definite red flag. Consistently positive customer reviews are one of the best indicators that you’ve found a trustworthy pro who will get the job done right.
How Much Does a Tankless Water Heater Cost?
Thinking about upgrading to a tankless water heater is exciting, but it’s natural to wonder about the price tag. The total cost includes the unit itself, professional installation, and any potential modifications to your home’s plumbing or electrical systems. Understanding these components will help you create a realistic budget and see the long-term value in your investment. Let’s break down what you can expect to pay.
Breaking Down Installation Costs
On average, a professional tankless water heater installation costs between $1,200 and $3,500. This price typically includes both the new unit and the labor required to get it running perfectly. While the upfront investment is higher than a traditional tank heater, the long-term energy savings and a much longer lifespan make it a smart financial choice. The best way to get an accurate estimate for your home is to have a professional assess your specific needs when you schedule a service consultation.
Factors That Affect the Price
Several key factors can influence the final cost of your installation. The fuel type is a major one—electric models are often less expensive upfront but may require an electrical panel upgrade. Gas units have a higher initial price but are incredibly efficient. You might also need to budget for extra work, such as upgrading gas lines to meet the new unit’s demands or installing special venting for safety. A qualified plumber will identify these needs during an initial assessment so there are no surprises on the final bill.
Budgeting for Ongoing Maintenance
To keep your tankless water heater running efficiently for its 20+ year lifespan, annual maintenance is key. The most important task is descaling the unit to remove mineral buildup, which is especially important here in Southern California where hard water is common. Professional descaling services usually cost between $100 and $500 and help you avoid issues that can lead to expensive repairs. Think of it as a small investment to protect your larger one and ensure you get reliable, efficient hot water for years to come.
Understanding Potential Repair Costs
Tankless water heaters are known for their durability, but like any appliance, they can sometimes need repairs. If you notice fluctuating water temperatures, a drop in water pressure, or hear strange noises coming from the unit, it’s time to call a professional. Addressing these issues early can prevent them from turning into bigger, more costly problems. Common repairs might involve replacing a heating element or fixing an ignition issue. Having a trusted plumber on call gives you peace of mind, knowing your system is in good hands.
Top Tankless Water Heater Brands Plumbers Trust
When you start shopping for a tankless water heater, the number of options can feel overwhelming. But if you ask experienced plumbers, you’ll find they often recommend the same few brands. That’s because professionals prioritize reliability, performance, and long-term value for their customers. We’ve installed countless units across Southern California, and we consistently see certain brands stand out for their quality engineering and customer satisfaction. If you’re ready to find the perfect fit for your home, our team can help you schedule a service consultation.
Here are the top brands that have earned the trust of plumbers everywhere.
Rinnai
Rinnai is a name that comes up again and again for its incredible efficiency and rock-solid reliability. These units are built to last, often having a lifespan up to twice as long as a traditional tank heater. Many models boast a high Uniform Energy Factor (UEF), which translates to real savings on your energy bills. For most homes, a model like the Rinnai RX199iN is a fantastic choice, especially when you add a recirculation pump to get hot water even faster. It’s a durable, high-performance option that provides peace of mind for years to come.
Navien
If you’re looking for cutting-edge technology and top-tier efficiency, Navien is a brand worth your attention. Their tankless water heaters are engineered to deliver an endless stream of hot water while keeping energy use to a minimum. A key feature in many Navien models is a dual stainless steel heat exchanger, which protects against corrosion and improves durability. Plumbers appreciate their compact, space-saving design and straightforward installation process, making them a popular and practical choice for both modern homes and commercial properties that need dependable performance.
Bosch
Bosch has built a strong reputation for quality and innovation, and their tankless water heaters are no exception. These units are designed to be compact, quiet, and highly energy-efficient, giving you hot water right when you need it without a bulky storage tank. Homeowners and plumbers alike trust Bosch for consistent performance and reliability. The brand offers a variety of models, so it’s easy to find one that fits your household’s specific size and hot water demands, ensuring you get a system that’s just right for your needs.
Rheem
As a long-standing leader in the water heating industry, Rheem is known for its dependable and innovative tankless solutions. Their products are designed to provide consistent, on-demand hot water while also being very energy-efficient. Many newer Rheem models come with advanced features like Wi-Fi connectivity, allowing you to monitor and control your water heater from your smartphone. Plumbers trust the Rheem name for its proven reliability, and the company backs its products with extensive warranties, giving homeowners an extra layer of confidence in their investment.
Common Tankless Water Heater Problems a Pro Can Fix
Tankless water heaters are fantastic for their efficiency and on-demand hot water, but they aren’t indestructible. When something goes wrong, it’s tempting to search for a quick fix online, but these complex systems often require a professional touch. Trying to handle repairs yourself can lead to bigger, more expensive issues and can even be unsafe. A qualified plumber can quickly diagnose the problem and get your hot water flowing again without the guesswork. Here are some of the most common issues that are best left to the pros.
Inconsistent Water Temperature
Have you ever been in the shower when the water suddenly goes cold for a moment before heating back up? This frustrating experience, sometimes called a “cold water sandwich,” is a common complaint with tankless systems. It often happens when the demand for hot water is too high, like when you’re running the dishwasher and a shower at the same time. This temperature fluctuation could mean your unit is undersized for your household’s needs or that a component is failing. A professional can assess your system, check the flow rate, and identify the root cause to ensure you get a consistently hot stream of water every time you turn on the tap.
Low Water Flow or Pressure
If you’ve noticed that your water pressure isn’t what it used to be, your tankless water heater could be the culprit. Over time, mineral buildup from hard water can clog the unit’s internal components and filters, restricting water flow. This is a particularly common issue here in Southern California. While it might seem like a minor annoyance, it forces your system to work harder and can lead to premature failure. A plumber can perform a full system check and clear any blockages. Sometimes, the issue is part of a larger plumbing problem, so having a pro who understands residential drain cleaning services is a huge plus.
System Error Codes and Shutdowns
Modern tankless water heaters come with built-in diagnostic systems that display error codes when something is wrong. While it’s helpful to have a clue about the problem, these codes often point to complex internal issues like ignition failure, ventilation blockages, or sensor malfunctions. Simply resetting the unit won’t fix the underlying problem and could lead to a complete system shutdown. Instead of guessing, it’s best to schedule service with a professional. They have the tools and expertise to accurately interpret the codes, safely make the necessary repairs, and ensure your unit is operating correctly and efficiently.
Hard Water Buildup and Descaling
One of the biggest enemies of any water-using appliance in Southern California is hard water. The mineral deposits, or scale, build up inside your tankless heater’s delicate heat exchanger over time. This forces the unit to use more energy to heat the water, reduces its efficiency, and can shorten its lifespan significantly. To keep your heater running smoothly for its expected 20+ years, it needs to be descaled regularly—at least once a year. While DIY kits are available, a professional descaling service is far more thorough and eliminates the risk of damaging sensitive components, helping you avoid more serious issues like needing a residential sewer pipe repair.
Tankless Water Heater Myths vs. Reality
Tankless water heaters are a fantastic upgrade for many homes, but they’re also surrounded by a lot of misinformation. It’s easy to get tripped up by claims that sound too good to be true. Let’s clear the air and separate the facts from the fiction so you can make a confident decision for your home. Understanding the reality of how these systems work will help you set the right expectations and ensure you get the most out of your investment. From “endless” hot water to maintenance needs, we’ll break down the most common myths.
The “Unlimited” Hot Water Myth
This is probably the biggest selling point you hear, but it’s a bit misleading. While it’s true that tankless heaters provide hot water on demand instead of storing it, they don’t have an infinite capacity. Their output is measured by a flow rate—how many gallons per minute they can heat. If you have multiple hot water appliances running at once, like a shower, the dishwasher, and a washing machine, you could push the unit past its limit. This might result in lukewarm water. The key is to have a professional size the unit correctly for your household’s needs to ensure you always have a steady, reliable supply.
Myth: Installation is Always Complicated
The idea that installing a tankless water heater is a massive, complex project scares some homeowners away. While the process is more involved than swapping out a traditional tank heater, it’s not necessarily a headache when handled by a professional. The complexity often depends on your home’s existing plumbing, gas lines, and ventilation. A skilled plumber will assess your setup and handle all the connections safely and efficiently. Trying to DIY this project can lead to code violations or dangerous mistakes. It’s always best to schedule service with a qualified team that understands the specific requirements for a safe and effective installation.
Myth: They Don’t Need Maintenance
This is a dangerous and costly myth. Just like any other major appliance in your home, a tankless water heater needs regular care to perform its best. Because they work by heating water as it passes over a heating element, they are susceptible to mineral buildup, especially in areas with hard water like Southern California. This buildup can reduce efficiency and eventually cause the system to fail. Getting regular check-ups and descaling your unit annually is crucial for protecting your investment, ensuring it runs efficiently, and extending its lifespan. Neglecting this simple task can lead to expensive repairs down the road.
How to Find and Vet a Qualified Plumber
Finding the right plumber for your tankless water heater doesn’t have to be a shot in the dark. With a little homework, you can find a reliable professional who will get the job done right. You want someone with the right skills, a solid reputation, and transparent pricing. Following these simple steps will help you confidently choose a plumber you can trust.
Research and Screen Your Options
Start by creating a shortlist of local plumbers from recommendations and online reviews. Once you have a few names, verify their credentials. A qualified plumber has gone through extensive training; to work unsupervised, they must complete thousands of training hours to become a licensed contractor. This ensures they have the skills to handle complex jobs, like a specialized trenchless pipe repair. Don’t be shy about asking for a license number—it’s a basic check that separates the pros from the amateurs and confirms their commitment to professional standards.
Get Multiple Quotes
Once you’ve confirmed a few plumbers are licensed and have good reviews, get estimates. To ensure you’re getting a fair price, you should “always get at least three price estimates from different licensed plumbers.” This simple step could save you hundreds of dollars. Request a detailed, written quote that breaks down costs for labor and materials. Comparing quotes isn’t just about finding the lowest price; it’s a chance to see how different professionals assess the job. A clear estimate is often a sign of a trustworthy plumber. You can easily schedule a service call to get a detailed quote.
Ask These Key Questions Before You Hire
Before making your final decision, talk with your top candidates. This is your opportunity to gauge their expertise and ensure they’re a good fit. It’s important to “talk to a qualified plumber to figure out if a tankless water heater is the right choice for your home.” A good plumber will listen to your needs and help you weigh the pros and cons. Also, ask about their certifications, which serve as “formal validation of a plumber’s technical knowledge, safety awareness, and compliance with industry standards.”
Here are a few key questions to ask:
- Are you licensed, bonded, and insured?
- Do you have specific experience with my brand of tankless water heater?
- Can you provide a few references from recent jobs?
- What kind of warranty do you offer on your parts and labor?
What to Expect During a Professional Installation
Knowing what happens during a tankless water heater installation can make the process feel much less intimidating. When you hire a qualified professional, you’re not just paying for a new appliance; you’re investing in a seamless, safe, and efficient setup from start to finish. A pro will handle every detail, from making sure your new unit is a perfect fit for your home to ensuring it runs flawlessly before they leave.
The entire process is methodical, designed to prevent future problems and guarantee your system complies with all local codes. It typically breaks down into three main phases: a thorough assessment and plan, the careful removal of your old unit, and the precise installation and testing of your new one. Understanding these steps helps you see the value in professional service and gives you the confidence that the job is being done right. If you’re ready to get started, you can always schedule a service with our team to get a personalized assessment.
Step 1: Assessment and Planning
Before any tools come out, your plumber will start with a detailed assessment of your home. They’ll evaluate your current plumbing, electrical, and gas lines to determine what, if any, upgrades are needed to support a tankless system. This is also when they confirm the unit size is appropriate for your family’s hot water demands. A crucial part of this planning phase, especially for gas models, is mapping out the ventilation path. Proper venting is non-negotiable for safety, and an experienced plumber knows exactly how to plan it according to code. This initial step ensures the entire installation is built on a solid, safe foundation.
Step 2: Removing the Old Unit
Once the plan is set, it’s time to say goodbye to your old water heater. Your plumber will begin by shutting off the water, gas, and electrical supply to the unit. If you have a traditional tank heater, they will completely drain it before disconnecting any lines. This step requires careful handling of gas and electrical connections, which is a key reason why hiring a licensed plumber is so important for your safety and peace of mind. After everything is safely disconnected, they will carefully remove the old, often bulky, unit from your property, clearing the way for your new, efficient system.
Step 3: Installing and Testing Your New Heater
With the old unit gone, the plumber will mount your new tankless water heater and meticulously connect the water, gas or electrical, and ventilation lines. This is where their technical expertise really shines. Certified plumbers are trained to follow manufacturer specifications and industry standards to the letter, ensuring every connection is secure and compliant. After the installation is complete, they won’t just pack up and leave. They will thoroughly test the system, checking for leaks, verifying correct water pressure, and calibrating the temperature settings. Finally, they’ll walk you through how to operate your new heater so you feel comfortable from day one.
When to Call a Plumber for Your Tankless Water Heater
Tankless water heaters are known for their efficiency and longevity, but they aren’t completely maintenance-free. Just like any other important appliance in your home, they need professional attention from time to time to perform their best. Knowing when to pick up the phone can save you from cold showers, frustrating performance issues, and costly future repairs. It’s all about recognizing the difference between a minor hiccup and a real problem. Here’s how to tell when your unit is asking for help, why routine check-ups are so important, and what situations count as a true emergency.
Warning Signs You Can’t Ignore
Your tankless water heater is pretty good at letting you know when something is wrong. If you’re experiencing fluctuating water temperatures—going from lukewarm to scalding in the middle of a shower—that’s a major red flag. Another key indicator is a sudden drop in water pressure or flow when you turn on the hot tap. These aren’t just minor annoyances; they often point to bigger issues like mineral buildup clogging the system or a problem with the internal heating components. Ignoring these symptoms can turn a simple fix into a much more complicated and expensive repair down the road. If your water heater is acting up, it’s best to have a professional take a look.
Scheduling Routine Maintenance
Think of professional maintenance as a wellness check for your water heater. To keep your tankless system running efficiently and help it last for years to come, it’s a good idea to have it serviced at least once a year. During a maintenance visit, a plumber will typically descale the unit to remove hard water minerals—a common issue here in Southern California—and inspect its components for wear and tear. This simple, proactive step helps your heater perform at its best, keeps your energy bills in check, and can prevent unexpected breakdowns. With proper care, your unit can last for over 20 years, making routine service a smart investment. You can easily schedule an inspection to keep everything in top shape.
Knowing When It’s an Emergency
Some situations go beyond a simple glitch and require immediate professional attention. If you have no hot water at all, hear loud popping or banging sounds from the unit, or see water leaking from the heater itself, it’s time to call a plumber right away. These are signs of a serious malfunction that needs to be addressed quickly. Because tankless water heaters involve a combination of water, high-voltage electricity, and sometimes gas, attempting a DIY repair is not only risky but can also void your warranty. Don’t hesitate to reach out for professional help when you spot a major problem. A qualified plumber can safely diagnose the issue and prevent further damage to your home and your water heater.
Keep Your Tankless Water Heater Running Smoothly
Your tankless water heater is a fantastic piece of technology, delivering hot water on demand while saving energy. But just like any other major appliance in your home, it needs a little TLC to perform at its best. Think of it like a car—you wouldn’t skip oil changes and expect it to run forever. A bit of routine maintenance will protect your investment, keep your energy bills in check, and ensure you have reliable hot water for years to come. The good news is that keeping your unit in top shape is pretty straightforward. Here are the three most important things you can do.
Descale Your Unit Annually
If you live in Southern California, you’re likely familiar with hard water. Those extra minerals in our water supply can build up inside your tankless water heater over time, creating a layer of scale on the heating elements. This buildup forces your heater to work harder to warm the water, which reduces its efficiency and can drive up your energy costs. Over time, it can even shorten the lifespan of your unit. Descaling your heater once a year is the best way to flush out these mineral deposits and keep it running like new. It’s a simple preventative step that prevents clogs, protects internal components, and ensures your heater operates at peak performance.
Clean or Replace the Filters
Your tankless water heater has a few different filters that act as gatekeepers, stopping sediment and debris from getting inside and causing problems. The main water inlet filter is especially important, as a clog here can lead to a frustrating drop in water pressure. It’s a good idea to check and clean this filter regularly. Depending on your model, you might also have an air filter that needs cleaning to ensure proper combustion. During a maintenance check, a professional will also inspect other key parts, like the fans and heat exchanger, to make sure everything is clean and functioning correctly. This comprehensive approach keeps the entire system healthy and efficient.
Schedule Professional Inspections
While you can handle some basic tasks, nothing beats having a trained professional look at your system once a year. A licensed plumber can spot potential issues you might miss, from subtle signs of corrosion to ventilation problems that could pose a safety risk. A professional inspection gives you peace of mind, ensuring your unit is operating safely and efficiently. It’s also the best way to catch small problems before they turn into major, costly repairs. If it’s been more than a year since your last check-up, it’s a great time to schedule a service call and get your tankless water heater the expert attention it deserves.
Related Articles
- Hiring a Tankless Water Heater Installer: A Complete Guide – Sewer Solutions
- Water Heater Installation Guide: Costs & Process – Sewer Solutions
Frequently Asked Questions
How long does a tankless water heater really last? You can expect a well-maintained tankless water heater to last 20 years or even longer, which is often double the lifespan of a traditional tank heater. The key to reaching that long life is consistent annual maintenance. Here in Southern California, that means having a professional descale the unit every year to prevent hard water buildup from damaging the internal components.
Will a tankless water heater save me money immediately? While you’ll start seeing savings on your monthly energy bills right away, the upfront investment for a tankless system is higher than a standard tank heater. The real financial benefit comes over the long term. Because the unit only heats water when you need it, the cumulative energy savings eventually offset the initial installation cost, making it a smart financial decision for the life of the appliance.
What’s the main difference between gas and electric models? The biggest difference comes down to power and installation needs. Gas models are typically more powerful, making them a great choice for heating water for an entire household. However, they require a dedicated gas line and proper ventilation to the outdoors for safety. Electric models are often easier and less expensive to install, but a large, whole-home unit might require an upgrade to your home’s electrical panel to handle the power demand.
How do I know what size tankless water heater my home needs? Sizing a tankless unit isn’t about gallons like a traditional tank. Instead, it’s based on the flow rate you’ll need—basically, how many hot water fixtures you might use at the same time—and the temperature rise required to heat the cold water coming into your home. A professional will calculate this for you to ensure your unit can handle your family’s peak demand without any drop in performance.
Can I install a tankless water heater anywhere? Their small size gives you a lot more flexibility than a bulky tank heater, allowing them to be mounted on a wall in a utility closet, garage, or even an attic. However, the final placement depends on practical factors. The unit needs access to water lines, a sufficient power source (gas or electric), and, for gas models, a clear path for ventilation. A plumber will help you find the safest and most effective location during an initial assessment.