Introduction
Purchasing a new water heater can be a daunting task, with various sizes, brands and models available on the market. One of the most important things to consider when shopping for a new water heater is its efficiency rating. The efficiency of your water heater can have a significant impact on your energy bills, as well as on the environment. Here we discuss the different types of water heater efficiency ratings, what to look for and how to understand them.
Types of Efficiency Ratings
Energy Factor (EF)
Energy Factor (EF) is the most commonly used rating for water heaters. It measures the amount of hot water produced per unit of fuel consumed over a typical day. An EF of 1.00 means that all the fuel consumed by the water heater is used to heat the water, and none is lost. The higher the EF rating, the more efficient the water heater.
Uniform Energy Factor (UEF)
Uniform Energy Factor (UEF) is a new rating system that replaces EF. It is a more accurate measure of water heater efficiency and takes into account the energy consumed during standby (the time when a water heater is not in use). The higher the UEF, the more efficient the water heater.
First Hour Rating (FHR)
First Hour Rating (FHR) refers to the amount of hot water a water heater can deliver during peak usage hours, typically the first hour after being filled. It takes into account the size of the tank, the recovery rate, and the temperature rise needed to deliver hot water. The higher the FHR number, the more hot water the water heater can provide.
Understanding Efficiency Ratings
Size and Type of Water Heater
The efficiency rating of a water heater is affected by its size and type. Tankless water heaters are generally more efficient than storage tank water heaters, as they only heat water on demand. However, they may not be suitable for households that require a large volume of hot water at one time. Also, the larger the tank size, the more energy is required to heat the water, which can affect the efficiency rating.
Fuel Type
The type of fuel used to power the water heater can also affect its efficiency rating. Gas water heaters are generally more efficient than electric, as gas is cheaper and burns cleaner. However, if gas is not available, electric water heaters may be the only option.
Temperature Settings
The temperature setting of a water heater can also impact its efficiency rating. Lowering the temperature setting can reduce energy consumption and improve efficiency. The recommended temperature for a water heater is 120 degrees Fahrenheit, which is hot enough for most household needs.
Climate
The climate in which a water heater operates can also affect its efficiency rating. In colder climates, the water entering the water heater is colder, requiring more energy to heat it. In warmer climates, less energy is required to heat the water.
Conclusion
In summary, understanding the efficiency ratings of a water heater is crucial in making an informed decision when purchasing a new one. The most commonly used rating is the Energy Factor (EF), which measures the amount of hot water produced per unit of fuel consumed over a typical day. The Uniform Energy Factor (UEF) is a more accurate rating system that takes into account the energy consumed during standby. The First Hour Rating (FHR) measures the amount of hot water a water heater can deliver during peak usage hours. Other factors, such as size and type of water heater, fuel type, temperature settings and climate, can also affect its efficiency rating. By carefully considering these factors, you can choose a water heater that is both efficient and meets your household needs.