How Tankless Water Heaters Work

How Tankless Water Heaters Work

Tankless heaters, termed on-demand or instant, are a contemporary option versus conventional water heaters. Rather than storing hot water, they heat water only when the tap is turned, conserving energy and space. Notably, gas-powered and electric models, especially Eccotemp's tankless water heaters, are esteemed for reliability and efficiency. This blog will explain how tankless water heaters work, the benefits of gas and electric models, and the transition from traditional to tankless systems. Enjoy the convenience of instant hot water without waiting for tank heating and without the energy waste associated with maintaining hot water unnecessarily.

Why Choose Tankless Water Heaters

Tankless water heaters offer several compelling reasons to choose them over traditional water heating systems. One key advantage is their energy efficiency. Unlike traditional water heaters that keep a large tank of water constantly heated, tankless water heaters only heat water as needed. It means they don't waste energy keeping water hot when it's not being used, resulting in lower energy bills and reduced environmental impact.

Another reason to choose tankless water heaters is their space-saving design. Traditional water heaters can take up a lot of space, especially if they have a large storage tank. Tankless water heaters, on the other hand, are much smaller and can be mounted on a wall, freeing up valuable floor space in your home. Additionally, tankless water heaters provide an endless supply of hot water. Since they heat water on demand, there's no risk of running out of hot water, even if multiple taps are running simultaneously. This makes tankless water heaters ideal for large households or families with high hot water demands. Overall, the energy efficiency, space-saving design, and endless hot water supply make tankless water heaters an attractive choice for many homeowners.

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Understanding How Tankless Water Heater Works

Tankless water heaters have a sophisticated heating system at their core, aiming to provide hot water whenever you need it. Whether they run on gas or electricity, their main objective is to heat water rapidly and effectively. Let's dive into how tankless water heaters work and uncover the secrets behind their operation.

Gas Tankless Water Heaters

Gas Tankless Water Heaters stand at the forefront of innovation, leveraging the versatility and efficiency of natural gas and propane to deliver unparalleled performance. Upon activation, a gas-powered tankless water heater ignites a burner, heating a heat exchanger.

Gas tankless water heaters operate by quickly heating water as it flows through a heat exchanger when you turn on a hot water tap. Unlike traditional water heaters that keep a large amount of water constantly heated in a storage tank, tankless water heaters only heat water as needed, eliminating standby heat loss. This efficient design ensures that hot water is available immediately whenever you need it, without the need to wait for a storage tank to refill and reheat. By only heating water on demand, tankless water heaters conserve energy and resources, making them a popular choice for residential water heating. Their ability to provide instant hot water and reduce energy waste contributes to their increasing popularity among homeowners seeking efficient and convenient hot water solutions.

Gas tankless water heaters operate with optimal energy efficiency by heating water only when needed, avoiding the energy losses common in traditional water heaters that keep a reservoir of hot water constantly heated. This on-demand heating method not only saves energy but also makes them suitable for homes with limited space due to their compact size. As homeowners increasingly prioritize energy efficiency and convenience, tankless water heaters have become a popular choice for meeting hot water needs sustainably. Their ability to provide hot water instantly while minimizing energy waste aligns with the growing demand for eco-friendly and efficient household appliances.

Key Components of Gas Tankless Water Heaters

  • Gas Burner: In gas tankless water heaters, such as those made by Eccotemp, the gas burner is the main component that heats the water. When you turn on the hot water tap, the gas burner ignites instantly, heating the water as it flows through the water heater. This method ensures that hot water is available immediately, without the wait time typical of traditional water heaters that store hot water in a tank. Eccotemp gas tankless water heaters use this efficient gas burner system to provide a steady and continuous hot water supply. It means you can enjoy hot water whenever you need it, whether for a shower, washing dishes, or doing laundry, without worrying about running out. The on-demand heating mechanism not only enhances convenience but also improves energy efficiency, as it eliminates the need to constantly keep a large volume of water heated. It makes Eccotemp gas tankless water heaters a practical and reliable choice for ensuring a consistent and energy-efficient hot water supply in your home.
  • Heat Exchanger: In tankless water heaters, the heat exchanger is a vital part that helps transfer heat from the burner to the water. Located at the core of the water heater, the heat exchanger is designed to heat water efficiently by maximizing the transfer of heat and minimizing energy loss. When you turn on a hot water tap, cold water flows into the heat exchanger, where it quickly absorbs heat from the burner, ensuring the water reaches the desired temperature almost instantly. Unlike traditional water heaters that store and constantly reheat a large tank of water, tankless water heaters heat water only when needed, which makes them more energy-efficient. This on-demand heating system saves energy and also provides an endless supply of hot water, as the water is heated as it flows through the unit. The efficiency and reliability of the heat exchanger are crucial for the performance of tankless water heaters, making them an excellent choice for homeowners who want a continuous and efficient hot water supply without the bulk and energy waste of traditional systems.
  • Flow Sensor: Tankless water heaters are equipped with flow sensors that detect when hot water is needed. These sensors are crucial, as they prompt the heating process as soon as water flow is detected. When you turn on a hot water tap, the flow sensor signals the water heater to start heating the water as it passes through the system. It ensures that hot water is delivered immediately, meeting your needs efficiently. By operating on demand, tankless water heaters provide a continuous and dependable supply of hot water, ensuring you have access to hot water whenever you need it. The functionality of the flow sensor is essential for the efficient operation of tankless water heaters, allowing them to respond quickly to changes in water demand and provide a seamless hot water experience for users.

Eccotemp Gas Tankless Water Heaters

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Eccotemp Gas Tankless Model: SH22-ING

Eccotemp Gas Tankless Water Heaters incorporate advanced technology to deliver efficient and reliable hot water solutions. These units feature a gas burner that heats water as it passes through a heat exchanger. When you turn on the hot water tap, the burner ignites quickly, precisely raising the water temperature to your desired level. This seamless process ensures a consistent flow of hot water, making Eccotemp gas tankless water heaters suitable for households of all sizes. Whether you live in a small apartment or a large home, Eccotemp gas tankless water heaters provide a dependable supply of hot water whenever you need it.

The design of Eccotemp Tankless Water Heaters ensures optimal performance and energy efficiency. They heat water only when needed, eliminating the energy waste common in traditional water heaters that continuously keep a tank of water hot. Without a storage tank, Eccotemp tankless water heaters also minimize standby heat loss, further enhancing their efficiency. This innovative design ensures that you have hot water on demand while reducing energy consumption and operating costs. With their reliable performance and eco-friendly design, Eccotemp gas tankless water heaters offer a convenient solution for meeting hot water needs in homes. Whether you live in a small apartment or a large house, Eccotemp tankless water heaters provide a consistent supply of hot water while helping you save energy and reduce your environmental impact.

Electric Tankless Water Heaters

Electric tankless water heaters provide an alternative to gas models, offering unique benefits. Unlike gas tankless water heaters, which heat water using a gas burner, electric models rely on powerful heating elements. While they might not provide the same instant heating capability as gas tankless water heaters, electric tankless water heaters are known for their reliability and straightforward operation, making them a preferred option for smaller living spaces like apartments and tiny homes.

One advantage of electric tankless water heaters is their simplicity in design and operation. With no need for a gas line or venting system, installation is typically easier and more affordable. An electric tankless water heater offers the benefit of being installed closer to the point-of-use, cutting down on the distance water has to travel through pipes and delivering hot water faster. This means less waiting time for hot water to reach your faucet or shower, improving overall convenience. Additionally, electric water heaters are often more compact, saving valuable space in cramped living quarters. They are also considered safer since there's no combustion involved, reducing the risk of gas leaks or carbon monoxide poisoning. Moreover, brands like Eccotemp will be launching smart electric models, which will provide advanced features like adjustable amperage settings, temperature control via a smartphone app, and compatibility with voice commands through devices like Amazon Alexa and Google Home, enhancing convenience and control for users.

Key Components of Electric Tankless Water Heaters

  • Heating Elements: These are the components responsible for heating the water as it passes through the water heater. Eccotemp tankless water heaters utilize powerful heating elements to quickly heat water on demand.
  • Tuner Feature: The tuner feature, accessible through the Eccotemp Smart App, allows users to adjust the maximum amperage output range from 11 to 27 kW according to the available electrical capacity at your location. This feature ensures that the water heater operates within the electrical capacity of the home, optimizing performance and energy efficiency.
  • Wi-Fi Quick Connect: This feature enables effortless pairing with your home network, ensuring seamless control of your device through the smart app. It allows for easy setup and communication between the water heater and the Eccotemp Smart App for remote control and monitoring.
  • Certifications and Warranty: Eccotemp tankless water heaters are certified by relevant regulatory bodies like ETL and FCC for installation in both residential and commercial applications. They also come with a limited manufacturer warranty, providing peace of mind to users.

Both Gas and Electric Tankless Water Heater have these feature:

  • Eccotemp Smart App: This is a mobile application that allows users to control their Eccotemp tankless water heater remotely. Through the app, users can adjust settings such as temperature, scheduling, and amperage output, providing convenient control from anywhere with a smartphone.
  • Voice Command Compatibility: Eccotemp tankless water heaters are compatible with voice command devices like Amazon Alexa and Google Home. It means users can control their water heater using simple voice commands, adding an extra layer of convenience to the user experience.
  • Sleek Design: Eccotemp tankless water heaters feature a sleek and compact design, making them suitable for installation in various spaces, including apartments, condos, and tiny homes. The wall-mounted design saves valuable floor space and integrates seamlessly with modern decor.
  • Efficient On-Demand Heating: Eccotemp tankless water heaters provide on-demand hot water, heating only the amount of water needed at any given time. This efficient operation helps to conserve energy and reduce utility costs.
  • Advanced Diagnostics: These features enable users to easily diagnose and troubleshoot any issues with their tankless water heater. This ensures optimal performance and reliability, minimizing downtime and inconvenience.

Benefits of Eccotemp Tankless Water Heaters

Eccotemp Tankless Water Heaters offer numerous benefits for residential water heating needs. These include efficient on-demand heating, a space-saving design, and reduced energy consumption compared to traditional water heaters.

  1. Endless Hot Water Supply: Experience the luxury of an endless hot water supply with Eccotemp Tankless Water Heaters, ensuring you never have to worry about running out of hot water. Delight in an uninterrupted shower, laundry cycles, and dishwashing tasks, all without the hassle of waiting for water to heat up. With Eccotemp, convenience and relief are guaranteed, allowing you to enjoy everyday tasks without disruption or inconvenience.

  2. Space-Saving Design: Say goodbye to bulky hot water tanks and reclaim valuable space in your home. Eccotemp Tankless Water Heaters feature a compact footprint, making them ideal for installations in tight spaces or small utility rooms.

  3. Energy Efficiency: By heating water only when needed, Eccotemp Gas Tankless Water Heaters minimize energy waste and reduce utility bills. Experience significant cost savings over the long term while reducing your carbon footprint.

  4. Longevity and Reliability: Designed for durability, Eccotemp Gas Tankless Water Heaters offer a lifespan of up to 20 years, outlasting conventional water heaters. With this longevity comes peace of mind, ensuring a reliable hot water supply for decades to come.

  5. Customizable Settings and Controls: Take control of your hot water system with user-friendly controls and adjustable settings, allowing you to customize temperature preferences and optimize energy usage.

  6. Advanced Technologies: Eccotemp also offers smart tankless water heaters that integrate features like instant hot water and experience effortless water heater management with the Eccotemp Smart App, providing convenience and control over your hot water system.

  7. Reduced Risk of Water Damage: Bid farewell to the threat of tank failures and ruptures. Eccotemp Tankless Water Heaters, free of stored water, eliminate the risk of significant water damage, though vigilance regarding pipes and fixtures is still essential.

  8. Safety: Experience precise temperature control, eradicating sudden hot water spikes. Eccotemp's commitment to safety ensures a reliable and comfortable hot water supply.

Factors to Consider When Choosing a Tankless Water Heater

Selecting the right tankless water heater involves considering various factors to ensure optimal performance and compatibility with your home's requirements. Key considerations include:

  1. Heating Capacity (BTUs): Assess the heating capacity of the gas tankless water heater, typically measured in BTUs, to guarantee it can adequately cater to your household's hot water requirements, particularly during peak usage times. This evaluation ensures that the water heater can consistently deliver sufficient hot water to meet your needs without experiencing any interruptions or delays.

  2. Flow Rate: It's crucial to ascertain the necessary flow rate by considering the simultaneous usage of various hot water appliances, including showers, faucets, and dishwashers. This assessment ensures that the selected water heater can adequately meet the demand for hot water across multiple points of use in your household without compromising on performance or efficiency.

  3. Energy Efficiency: Prioritize energy efficiency when selecting a gas tankless water heater, focusing on models with high efficiency ratings to assess their potential for long-term utility savings. Opting for a tankless water heater with exceptional efficiency can minimize energy consumption and lower utility costs over time, making it a wise investment for your home's hot water needs.

  4. Sizing: When selecting a tankless water heater, it's crucial to select the appropriate size to accommodate your household's requirements effectively. Consider the various factors, including the number of occupants in your home, the frequency of simultaneous water usage, and the desired hot water temperature. By considering these aspects, you can ensure that the chosen tankless water heater meets your household's hot water demands efficiently and reliably.

  5. Installation Requirements: When contemplating a gas tankless water heater, factor in the installation requirements and determine whether professional plumbing services are necessary. Ensuring the proper setup and functionality of the water heater is crucial for its effective operation. By assessing the installation process beforehand and seeking professional assistance if needed, you can guarantee a smooth and efficient installation process, ultimately maximizing the performance and longevity of your tankless water heater.

  6. Maintenance: Regular maintenance is essential to keep your tankless water heater operating efficiently. This includes periodic descaling to prevent mineral buildup and ensure uninterrupted performance. Homeowners can optimize their tankless water heater investment by prioritizing maintenance. This proactive approach ensures a reliable and efficient hot water supply throughout the system's lifespan, maximizing the benefits of the investment.

Transitioning to a tankless water heater is a smart move to boost your home's comfort and energy efficiency. Tankless water heaters provide hot water on demand, eliminating the need for a storage tank and reducing energy waste. Discover key factors to consider when selecting the perfect tankless water heater for your home's needs with our 2024 Comprehensive Guide.

Addressing Potential Challenges

While Eccotemp Tankless Water Heaters offer numerous benefits, it is essential to acknowledge and address potential challenges associated with their usage:

  1. Flow Rate Management: Effective flow rate management is essential when selecting a gas tankless water heater to ensure it aligns with your household's hot water requirements. Proper sizing is paramount to preventing flow rate issues, as inaccuracies can result in inadequate hot water supply during peak usage. Careful planning and adjustment are necessary to avoid potential challenges and ensure consistent and reliable hot water delivery throughout your home.

  2. Performance Issues Due to Ventilation: Adequate ventilation is vital to ensuring the optimal performance of gas-powered tankless water heaters. Blocked vents can hinder efficiency and create safety risks, emphasizing the necessity for routine maintenance and inspections. By prioritizing proper ventilation and conducting regular checks, homeowners can mitigate the likelihood of performance issues and maintain the safety and efficiency of their tankless water heating systems.

  3. Mineral Buildup Prevention: Like all water heating systems, gas tankless water heaters are susceptible to mineral buildup over time, which can affect performance and efficiency. Implement a regular maintenance schedule, including water filter replacements, to mitigate mineral buildup and ensure optimal operation.

  4. Cost Considerations and Long-Term Savings: While the initial cost of a gas tankless water heater may be higher than that of a traditional water heater, the long-term savings in energy costs and maintenance expenses justify the investment. Eccotemp gas tankless water heaters boast high efficiency ratings and durable construction, offering significant savings over their lifespan. Additionally, the compact design of these water heaters saves space and enhances the aesthetic appeal of your home. By factoring in installation costs and energy savings, homeowners can make a cost-effective choice that delivers value for years to come.

Embrace the Future of Hot Water with Eccotemp

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As a testament to innovation and reliability in the world of hot water solutions, Eccotemp is consistently reshaping the industry landscape with its array of gas tankless water heaters. By merging cutting-edge technology with unparalleled reliability, Eccotemp delivers homeowners an elevated hot water experience characterized by efficiency and convenience.

Whether you're in the process of upgrading your current water heater or embarking on a fresh construction venture, the advantages of an Eccotemp Gas and Electric Tankless Water Heaters are worth considering. Bask in the liberation of never-ending hot water, the effectiveness of gas-powered heating, and the assurance derived from investing in a brand known for its reliability and excellence.


Question: How do tankless water heaters provide hot water instantly?
Answer: Tankless water heaters heat water directly as it flows through them without a storage tank. When you turn on a hot water tap, cold water travels through a pipe into the water heater, where a gas burner heats the water instantaneously, delivering hot water on demand.

Question: How do I install a tankless water heater?
Answer: For proper installation of a tankless water heater, it's advisable to enlist the services of a professional plumber. They'll ensure the water heater is correctly positioned, connect water and gas lines if needed, and adhere to local building codes for safe and efficient installation.

Question: What does a tankless water heater look like?
Answer: A tankless water heater is typically compact and wall-mounted, resembling a small box. It doesn't have a bulky storage tank, distinguishing it from traditional water heaters. It may have control buttons or a digital display for adjusting temperature settings.


Discover a new level of convenience, efficiency, and uninterrupted hot water access with Eccotemp Tankless Water Heaters. By embracing innovative technology and advanced features of these appliances, homeowners can enjoy a reliable, energy-efficient, and eco-friendly solution for meeting their household's hot water needs. With Eccotemp's Gas and Electric Tankless Water Heaters, you not only experience immediate access to hot water on demand but also gain the benefits of remote control and monitoring through the Eccotemp Smart App. This level of convenience empowers homeowners to optimize their hot water systems according to their specific preferences and usage patterns.

Say goodbye to the limitations of traditional water heating systems and welcome a new era of efficiency and savings with Eccotemp Tankless Water Heaters. With their sleek design, advanced features, and long-term financial benefits, these innovative appliances promise years of satisfaction and eco-conscious living. Make the switch today and elevate your home's hot water experience with Eccotemp.

Find The Right Water Heater

Our agents are here to help find the right water heater for your installation and needs. Tankless water heaters are not a one size fits all!

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    Smart Home 6.8 GPM Outdoor Tankless Water Heater, SH22 Series

    "Great value. If you compare the features with any other brands, you will not find another value. I’ve been extremely impressed with this unit."

    - Adam V.
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    6.8 GPM Indoor Tankless Water Heater, 45 Series

    "Saved The Day! We had a very old water heater that was notorious for taking 1 minute to get hot in the shower, the 45HI-NG has the shower hot in 10 seconds! Thank you Eccotemp!"

    - Tyler C.
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    Smart Home 2.5 Gallon Electric Mini Tank Water Heater

    "Great price, fast delivery. I installed the unit under the kitchen sink. From opening the box, plumbing and connecting via Wifi were no more than 60 mins. I'll monitor the daily KW usage. Strongly recommend trying this unit."

    - Wade T.
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    "We love ours. Imagine cool weather with muddy 4 wheelers, muddy dogs, muddy kids, & gear...well that would destroy a normal weekend but not ours. We love taking warm showers and cleaning up with ours! It truly has been a game changer."

    - Mark F.
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    Builder Series 6.0 GPM Indoor Tankless Water Heater

    "Cannot be happier with this water heater. My family came home from a long weekend and we all were in desperate need for showers. Family of five showered back to back with no issues. Thanks for making life that much easier!"

    - Ron S.
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    "Works great. Love it, does great for a family of 4, love the app and how you can adjust temp from phone. Works great for younger kids."

    - Redd
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    "This guy recuperates in 20 minutes or less... Easily installs and works on 120 volts with very low power consumption and you do not have to wire up for high amps or a 240 line. I highly recommend this unit."

    - Louis G.
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    Luxé 3.0 GPM Portable Outdoor Tankless Water Heater

    "Quickly heats water. I like the thermostat with digital reading of water temperature. Has ample pressure and never ran out of warm water rinsing my horse whose reaction was that he liked the warm water."

    - Betty S.
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    "Great buy! Great purchase! Installation was quick and easy. Highly recommend!"

    - John C.
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    "I installed the unit a month ago with some fantastic tech support. Over all I am very happy with the performance of the heater and would recommend this unit to anyone."

    - Marc D.
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    "Look and size of the hot water heater is perfect if you are adding this to a work shop or bathroom. This water heater uses Wi-Fi so you can connect to Alexa and ok Google. Very nice packaging and very clear, easy to follow directions."

    - Matt
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    Luxé 1.85 GPM Portable Outdoor Tankless Water Heater

    "Great Portable Water Heater. Delivers functionally and aesthetically. Very easy to set up and came with everything I needed. Well constructed and I like that I can easily see the water temp. Look forward to years of use."

    - ARS