How Do Tankless Water Heaters Work: A Clear and Neutral Explanation

Tankless water heaters have become a popular alternative to traditional hot water heaters due to their ability to produce hot water on demand without storing it beforehand. Unlike storage tank heaters, tankless water heaters can save space and energy by only heating water when it’s needed.

For those interested in purchasing a propane tankless water heater, the choices can be overwhelming. To help simplify the decision-making process, we have compiled a top-five list based on various factors including pricing, customer ratings, max GPM, heating capacity (BTUs), and Energy efficiency.

How Do Tankless Water Heaters Work?

Tankless water heaters use gas or electricity to quickly heat up cold water as it enters the unit. If gas is used, a gas burner is utilized, whereas electrical resistance heating coils are used for electric-powered units. This results in an almost unlimited supply of hot water at a rate of two to five gallons per minute for tankless water heater owners.

How to Get Started With A Tankless Water Heater

When considering switching from a traditional water heater to a tankless one, it’s important to take into account the temperature of the groundwater in your area. The average supply of groundwater in the northernmost parts of the United States is typically between 35 and 40 degrees Fahrenheit, while the southernmost parts average around 70 degrees Fahrenheit. This information is crucial in calculating the difference between your area’s coldest average groundwater temperature and your desired output temperature for your tankless heater, which should be between 100 and 115 degrees Fahrenheit in most cases.

To determine the required flow rate for your tankless heater, you’ll need to add up the gallons per minute required for each appliance that will be fueled by your tankless water heater. This will ensure that you have enough hot water for simultaneous use, such as running the dishwasher while someone is taking a shower. Your tankless heater’s needed flow rate is measured in gallons per minute.

Before investing in a tankless water heater, it’s important to consider the pros and cons. While tankless heaters are more energy-efficient and provide endless hot water, they can be more expensive upfront and may require additional maintenance. It’s important to weigh the benefits and drawbacks to determine if a tankless water heater is the right choice for your home.

Tankless Water Heater Pros

Convenience

Tankless water heaters are a great option for those who want to save space in their homes. They are significantly more compact than traditional water heaters, and can be installed in small spaces like closets or under sinks. This means that you can free up valuable space in your home for other uses.

In addition, tankless water heaters can provide a near-endless supply of hot water in a matter of minutes. This means that you can take a long shower or run the dishwasher without worrying about running out of hot water. Most tankless water heaters also have a front-facing panel that allows you to control their settings. This feature allows you to manage your water, heat, and electricity bills more effectively.

Efficiency

Tankless water heaters can help you save money on your energy bill in the long run. They are more efficient than traditional water heaters because they only heat water when you need it. This means that they use less energy overall, which can lead to significant savings over time.

Another advantage of tankless water heaters is that they last longer than traditional water heaters. They can last up to 20 years, which means that you won’t have to replace them as often. This reduces the amount of waste that ends up in landfills, which is good for the environment. Overall, tankless water heaters are a great choice for those who want to save space and money while enjoying a steady supply of hot water.

Tankless Water Heater Cons

Risk of Misuse

Tankless water heaters can be convenient, but they do come with some potential drawbacks. One of these drawbacks is the risk of misuse. If you miscalculate your desired flow rate, you could end up with serious inconveniences for your home. For example, if you underestimate the amount of hot water that you need on a daily basis, it could mean depriving yourself and other household members of a hot shower. Additionally, overloading the system could result in the system shutting down altogether, which could mean going hours (or longer) without hot water in the home.

Performance Issues

Another potential issue with tankless water heaters is performance issues. If the air supply to the heater is blocked and the heater is unable to vent, it may not function properly. This situation is not only a threat to your hot water supply, but it is also a serious fire hazard. Additionally, gas-powered tankless water heaters may fail to ignite properly, usually due to low gas supply. While this issue can usually be resolved by closing any open gas valves, it can still be an inconvenience for users.

Mineral Buildup

Mineral buildup can also be a problem with tankless water heaters. Heat causes the calcium and magnesium found in water to create a scaly substance that, over time, accrues. If not properly managed, the buildup can negatively affect the performance of tankless water. To avoid problems involving mineral buildup, tankless water heater owners must regularly monitor their water supply and change the water filter regularly.

Things to Consider When Buying a Tankless Water Heater

Energy Efficiency: Lowering Your Bills

One of the primary advantages of tankless water heaters is their energy efficiency. Unlike conventional water heaters that constantly maintain a large tank of hot water, tankless models only heat water when needed. This means you can potentially save on energy bills by reducing standby heat loss. Look for a tankless water heater with a high energy efficiency rating, such as Energy Star certification, to ensure maximum savings.

Flow Rate: Meeting Your Hot Water Needs

Another crucial factor to consider is the flow rate of the tankless water heater. This refers to the amount of hot water it can deliver per minute. Calculate your household’s peak hot water demand by considering the number of bathrooms, appliances, and fixtures that will be simultaneously used. Choose a tankless water heater with a flow rate that meets or exceeds your specific requirements to avoid any inconvenience.

Size: Space-Saving Solution

Tankless water heaters are known for their compact size, making them an excellent space-saving solution. Unlike traditional water heaters that occupy considerable floor space, tankless models can be wall-mounted, freeing up valuable real estate in your home. Consider the dimensions and weight of the tankless water heater to ensure it fits snugly into your desired installation location.

Fuel Type: Selecting the Right Option

Tankless water heaters can run on various fuel types, including electric, natural gas, and propane. Consider the availability and cost of different fuel sources in your area. Electric tankless water heaters are easy to install and maintain but may have higher energy consumption. On the other hand, gas-powered models are more energy-efficient but require proper venting and regular maintenance. Choose the fuel type that best suits your needs and budget.

Installation: Professional or DIY?

When it comes to installing a tankless water heater, you have two options: professional installation or a do-it-yourself approach. While DIY installation may seem cost-effective, it is essential to consider your skill level, knowledge of plumbing, electrical work, and the required tools. Improper installation can lead to performance issues or even safety hazards. Hiring a professional ensures a proper and safe installation, giving you peace of mind.

Lifespan and Warranty: Long-Term Investment

Tankless water heaters are a long-term investment, so it’s crucial to consider their lifespan and warranty. Typically, tankless models have a longer lifespan compared to traditional water heaters. Look for a unit with a warranty that covers both parts and labor for an extended period. This way, you can rest assured knowing that your investment is protected.

Maintenance and Service: Ensuring Optimal Performance

To maintain the optimal performance of your tankless water heater, regular maintenance is necessary. Some models require periodic flushing to prevent mineral buildup. Consider the maintenance requirements of the specific tankless water heater you are interested in, and ensure that you have access to professional service technicians who can assist you when needed.

Cost

Finally, cost is another potential drawback of tankless water heaters. They cost significantly more than standard water heaters, with a national average of about $2,200. Additionally, you’ll likely need a plumber to install your tankless water heater, which could cost up to $450. To correct for the possibility of overloading the system, some homeowners (with large houses) end up with two or even three tankless water heaters, which for some, is cost-prohibitive.

In summary, while tankless water heaters offer some benefits, there are also some potential drawbacks to consider before making the investment. It’s important to weigh the pros and cons carefully and make an informed decision based on your household’s needs and budget.

Final thoughts

When buying a tankless water heater, consider the factors mentioned above to make an informed decision. Keep in mind energy efficiency, flow rate, size, fuel type, installation, lifespan, warranty, maintenance, and service. By carefully considering these aspects, you can select a tankless water heater that meets your hot water needs while providing long-term energy savings and convenience. Enjoy the luxury of instant hot water at your fingertips!

Note: This blog post is for informational purposes and does not provide any advice or notes.