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Water heaters play a vital role in our daily lives, providing hot water for showers, dishwashing, and many other tasks. When it comes to choosing a new water heater, efficiency ratings are an important factor to consider.

Understanding these ratings can help you make an informed decision that not only saves you money in the long run but also contributes to environmental sustainability.

In this blog post, we will delve into the world of water heater efficiency ratings and explore how they can impact your overall experience.

Before all else, let’s get a better understanding of water heater energy efficiency ratings.

Understanding Water Heater Efficiency Ratings: What Are They?

Water heater efficiency ratings are primarily expressed as Energy Factor (EF) or Uniform Energy Factor (UEF). These ratings measure the overall efficiency of a water heater by considering factors such as fuel consumption, standby losses, and recovery efficiency. The higher the EF or UEF value, the more efficient the water heater is.

The number that the rating refers to denotes how much energy is used to power the heater. So, a UEF rating of 0.95 is not as energy efficient as a heater that’s been rated 3.5 for example.

Factors Affecting Efficiency Ratings

Several factors can influence the efficiency ratings of water heaters:


Well-insulated tanks help minimize standby heat loss, ensuring that the stored water remains hot for longer periods, thus reducing energy consumption.

Recovery Efficiency

Recovery efficiency determines how efficiently the water heater can heat incoming cold water to the desired temperature. Higher recovery efficiency leads to less energy waste.

Fuel Type

The type of fuel your water heater uses can impact its efficiency. Electric heaters tend to have higher EF ratings than natural gas or propane models.

Size and Usage

Choosing the right-sized water heater for your household’s hot water needs is crucial. An oversized or undersized unit can lead to inefficiencies and higher energy consumption.

Why Choose Energy-efficient Water Heaters

Understanding water heater efficiency ratings is essential for several reasons:

Energy Cost Savings

High-efficiency water heaters consume less energy, resulting in lower utility bills over time. Investing in an energy-efficient model can provide significant savings.

Environmental Impact

Water heating accounts for a substantial portion of residential energy consumption. By choosing a highly efficient water heater, you can reduce greenhouse gas emissions and promote a greener environment.

Long-Term Investment

Water heaters usually have a lifespan of around 10 to 15 years. Investing in an energy-efficient model ensures long-term savings and a reliable source of hot water for years to come.

Though the initial cost of an energy-efficient heater (like a tankless heater) is usually more expensive, its lower operating costs often justify its higher price since you’ll be enjoying lower energy bills.

Looking for the Most Energy Efficient Water Heater? Go for Tankless Heaters

Tankless water heaters, sometimes referred to as on-demand water heaters, do not employ storage tanks. Instead, they heat water directly, producing water on demand while offering some of the highest energy efficiency ratings. Many tankless models have ratings that exceed 0.9 EF which is considered good.

Water Heater Efficiency

Instead of wasting energy by heating large amounts of water (that may not be used), tankless heaters only heat the water that you consume. If you live in a home that uses less than 41 gallons of hot water each day, tankless heaters can be 24% to 34% more efficient than conventional water heaters. Meanwhile, homes that use more hot water daily can save 8% to 14%.

Choose White Plumbing for Expert Assistance

When it comes to selecting the right water heater for your home or business, it’s crucial to seek professional advice. White Plumbing is your trusted partner for all your plumbing needs. With many years of industry experience, we can help you navigate through various water heater options according to your requirements and budget.

Contact White Plumbing in Springfield today for help selecting an energy-efficient water heater. Once you’ve decided on a model, we’ll be happy to install it for you.


Understanding water heater efficiency ratings is key to finding a water heater you’ll be happy with. By considering factors such as energy efficiency, fuel type, insulation, and usage, you can choose a model that saves you money, reduces your environmental footprint, and provides a reliable source of hot water. 

Remember, for expert guidance and top-notch installation services, reach out to White Plumbing. Make a smart choice today and enjoy the benefits of an efficient water heating system for years to come.

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