# FAQ: What Is Energy Factor On Water Heater?

## What is a good energy factor for a water heater?

What’s a good water heater energy factor? Gas-powered water heaters typically have an energy factor between 0.5 and 0.7. One good way to determine whether or not a water heater is energy-efficient is to look for the Energy Star label.

## Where is the energy factor on a water heater?

To calculate a water heater’s energy factor, you take the amount of energy the water heater puts to use and divide it by the total amount of energy that goes into powering the unit. The higher the energy factor of a water heater, the more efficient it is.

## What is the difference between EF and UEF?

Previously, you may have seen efficiency measured by Energy Factor (EF). UEF replaces this metric. A higher UEF means a water heater is more energy efficient and will cost less to operate compared to other water heaters in the same bin. A water heater’s UEF can only be compared with water heaters within the same bin.

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## What is EF on water heater?

The energy factor (EF) indicates a water heater’s overall energy efficiency based on the amount of hot water produced per unit of fuel consumed over a typical day. This includes the following: Cycling losses – the loss of heat as the water circulates through a water heater tank, and/or inlet and outlet pipes.

## How many gallons should my water heater be?

But if you only need a loose estimate of what size you need (versus an exact calculation), follow these guidelines: For 1 to 2 people: 30-40 gallons. For 2 to 3 people: 40-50 gallons. For 3 to 4 people: 50-60 gallons.

## How efficient is my water heater?

The most efficient conventional gas-fired storage water heaters are ENERGY STAR models with energy factors between 0.67 and 0.70, corresponding to estimated gas use of 214 to 230 therms/year. A new electric water heater uses about 10 times more electricity than an average new refrigerator!

## What is a good energy factor?

If you’re going to buy an electric water heater, we suggest you look for one with an Energy Factor equal to. 93 or greater. This represents a 5 to 10 percent savings compared to a standard efficiency electric water heater.

## What is most efficient water heater?

Rheem’s Hybrid Electric Water Heater Is the Most Efficient Water Heater Available – Rheem Water Heaters – Rheem Manufacturing Company.

## What is the first hour rating of a water heater?

The first hour rating is the number of gallons of hot water the heater can supply per hour (starting with a tank full of hot water).

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## How do I know what UEF my water heater is?

UEF ratings are determined by assigning water heaters into one of four different categories of hot water usage and then evaluating their performance based on that usage. These categories are called bins. A water heater is assigned a UEF within its bin based upon its first hour rating.

## What is UEF AFUE rating?

AFUE stands for Annual Fuel Utilization Efficiency and measures how efficiently your furnace uses fuel. UEF is a newly developed metric for water heater energy savings and stands for Uniform Energy Factor.

## What does AFUE stand for?

AFUE measures a gas furnace’s efficiency in converting fuel to energy. A furnace that has an 80 percent AFUE rating can turn 80 percent of the energy it consumes into heat. The other 20 percent is used during the heating process.

## How much hot water does a shower use?

An average shower uses 56 litres (15 gallons) of hot water based on a water saving shower head using 7 litres/min (1.8 gallons/min) and a shower duration of 8 minutes. Assuming an average 8 minute hot water shower, consumption is 56 litres (15 gallons) of hot water to take a shower.

## How much power does an instant hot water heater use?

One whole-house tankless water heater has four 7,000-watt elements, for a total electrical load of 28,000 watts. This load re- quires wire and a circuit breaker that will handle at least 120 amps, at a cost many times that of electrical service to a conventional tank water heater.