How to Choose a Tankless Water Heater

At Roto-Rooter, we understand that selecting the right water heater for your home is a crucial decision that affects both your comfort and your wallet. With the rise in popularity of tankless water heaters, many homeowners are considering making the switch from traditional tank models. In this guide, we’ll dive into why a tankless water heater might be the right choice for you and how to select the best model for your needs.

Why Choose a Tankless Water Heater?

1. Energy Efficiency

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Tankless water heaters, often referred to as on-demand water heaters, provide hot water only as it is needed. Unlike traditional tank and hybrid water heaters that heat and reheat water continuously, tankless models heat water directly without the use of a storage tank. This on-demand operation leads to significant energy savings, as the absence of standby heat loss can reduce your energy bills by as much as 30%.

2. Longevity and Durability

Tankless water heaters generally have a longer lifespan compared to traditional tank heaters. On average, a tankless water heater can last up to 20 years, whereas tank models typically need to be replaced every 10 to 15 years. This extended lifespan can offset the initial higher cost of a tankless model over time.

3. Space Saving

Due to their compact size, tankless water heaters can be installed in smaller or more confined spaces. This is a significant advantage for homes with limited space, allowing for more flexible installation options, such as in closets or under cabinets.

4. Unlimited Hot Water

Imagine never running out of hot water during a shower again. Tankless water heaters provide a continuous supply of hot water, making them ideal for families or households where the demand for hot water is high.

How to Choose the Right Tankless Water Heater

1. Determine Your Demand

First, assess how much hot water your household uses at peak times. Consider the number of bathrooms, kitchen usage, and any appliances that require hot water. Tankless water heaters are available in various sizes and flow rates, which are measured in gallons per minute (GPM). A Roto-Rooter plumber can help calculate your total flow rate by adding up the GPM of each device that uses hot water in your home.

2. Select the Right Size

Choosing the correct size is crucial for ensuring your tankless water heater can meet your hot water needs without wasting energy. For instance, a small unit might struggle during peak usage, while an oversized unit can lead to unnecessary energy expenditure. Roto-Rooter plumbers can provide a detailed assessment to help you select a unit that matches your specific needs.

3. Energy Source

Tankless water heaters can be powered by electricity, natural gas, or propane. Your choice will depend on the availability and cost of these energy sources in your area. Generally, gas-powered models can handle higher flow rates compared to electric ones, making them suitable for larger households.

4. Efficiency Ratings

Look for the Energy Factor (EF) or Uniform Energy Factor (UEF) ratings when selecting a tankless water heater. These ratings measure the energy efficiency of the unit. The higher the rating, the more efficient the heater. Opting for a unit with a high EF or UEF rating can lead to more savings on energy bills.

5. Cost and Installation

The initial cost of a tankless water heater is higher than that of a traditional tank heater. However, the long-term savings on energy bills and the longer lifespan can compensate for the upfront cost. Installation costs can vary based on the complexity of the job and the type of unit selected. It’s important to have your tankless water heater installed by a professional plumber from Roto-Rooter to ensure it operates efficiently and safely.


Switching to a tankless water heater can provide numerous benefits, including significant energy savings, more available space, and an endless supply of hot water. At Roto-Rooter, our team of experienced plumbers is ready to help you determine the best tankless water heater for your home based on your specific needs and preferences. Remember, the right choice will depend on your household’s size, water usage habits, and budget considerations.

For more information or to schedule an installation, contact your local Roto-Rooter service provider today and take the first step towards efficient and effective hot water management in your home.