Debunking Myths About Tankless Water Heaters
Tankless water heaters are becoming more popular in New Mexico homes, especially for families wanting instant hot water and long-term energy efficiency.
But many homeowners still come across common myths about tankless water heaters, which can make it difficult to make an informed decision. Misconceptions about cost, hot water supply, maintenance, and lifespan often cause hesitation.
In this article, I break down the most common myths about tankless units so you can understand how these systems really operate. As a trusted installer of Navien tankless systems, our team at First Rate Plumbing Heating and Cooling helps homeowners choose and properly install the right tankless system for their household.
The Most Common Myths About Tankless Water Heaters
Tankless heaters provide hot water on demand, save money in the long run, and eliminate the need for a storage tank. But because many homeowners still compare them to traditional tank water heaters, several misconceptions continue to circulate. Let’s break them down.
Myth #1: “Tankless Water Heaters Are Too Expensive”
Many homeowners assume tankless water heaters cost too much because the initial cost is higher than a traditional tank water heater. The upfront purchase and installation can feel like a big step, especially when compared to storage tank systems. However, tankless systems offer long-term savings because they operate more efficiently and heat water only when needed.
Tankless units last significantly longer than traditional water heaters. While tank systems often last around 10 to 15 years, many tankless heaters operate well beyond two decades when properly maintained. This means you replace them less often, which results in additional savings over time.
Tankless systems also use less energy because they do not reheat water or waste energy keeping a tank of warm water ready. This becomes increasingly valuable as New Mexico energy costs rise.
“Yes, they are expensive upfront. However, their efficiency outweighs that upfront cost because they are gonna last longer and operate more efficiently.” — Andrea Griego, Co-Founder, First Rate Plumbing Heating and Cooling
Myth #2: “Tankless Units Give Unlimited Hot Water, No Matter What”
Tankless water heaters deliver hot water continuously, but only within their flow rate limits. This myth about tankless systems leads many homeowners to believe the unit can supply enough hot water for unlimited use, no matter how many fixtures run at the same time. In reality, flow rate matters because it determines how much hot water the heater can provide at once.
Whether you have a large household, multiple showers or a deep soaker tub, tankless units must be sized correctly to match your hot water demands. If the tankless system is undersized, you may experience warm water or temperature drops during simultaneous use, especially if someone is running clothes washing cycles or appliances at the same time.
This is why we evaluate the number of fixtures, household size and installation needs before selecting a unit. It’s most important that we size this unit correctly based on the number of people in your home and the fixtures in your home.
Tip: Navien also provides tankless water heater sizing guidance.
Myth #3: “Tankless Water Heaters Don’t Need Maintenance”
Tankless units require routine maintenance, especially in areas with hard water like Albuquerque, Rio Rancho and Los Lunas. Mineral buildup affects heat exchangers, reduces efficiency, and can cause the unit to overheat or shut down. Hard water also impacts water quality and long-term performance.
Annual inspections and flushing help remove scale and protect the system. Without maintenance, even efficient tankless heaters can experience reduced flow rates, inconsistent temperature and increased energy bills.
Regular care helps ensure the tankless system is properly maintained and reduces the risk of wasting energy or creating cold water surprises during daily use. To simplify maintenance, consider our annual tankless system maintenance through our membership program.
Myth #4: “Tankless Units Don’t Last as Long as Tanks”
Some homeowners believe tankless units wear out earlier due to their compact size or advanced technology. In reality, tankless water heaters outperform tank systems in lifespan when properly installed and maintained. Many traditional water heaters wear out faster due to sediment buildup and constant reheating cycles.
Tankless heaters do not store warm water, reducing the risk of rust, leaks, and heat exchanger corrosion. With routine maintenance, these units often last 20 years or more, offering greater efficiency and long-term savings. This makes tankless heaters a cost effective choice for many households seeking reliable hot water.
“Tankless units can actually last a lot longer than a tank water heater… in some cases, five to ten years longer with proper maintenance.” — Andrea Griego
Tankless units have fewer leak risks, work efficiently with recirculating pump systems and are better suited for today’s energy-efficient home standards.
When a Tankless Water Heater Is the Right Choice
Tankless water heaters are ideal for New Mexico families looking for lower energy bills, endless hot water (when sized correctly), and systems that take up less space. Homes with high hot-water demands, large tubs, or busy households benefit greatly from tankless installation.
However, a traditional tank water heater can still be the better option if the home requires extremely high simultaneous demand or if electrical or gas upgrades are not feasible. A tankless system is most efficient when it is properly installed, correctly sized, and paired with good water quality.
To protect your system from mineral buildup, consider our water treatment services to protect your tankless system from hard water issues.
Schedule a Tankless Water Heater Consultation in New Mexico
Myths about tankless water heaters can make the decision more confusing than it needs to be. With professional guidance, you can determine whether a tankless system matches your lifestyle, home layout, and hot water demands.
Our licensed, background-checked technicians at First Rate Plumbing Heating and Cooling provide quality work, transparent pricing, and our Final Price Guarantee on all installations. If you’re exploring tankless options, call (505) 859-4329 or request a consultation today to learn if a tankless unit is right for your home.