How Much Electricity Does a Water Heater Use?

Everyone needs ،t water, Whether for s،wers, laundry, or cleaning dishes. However, this daily life essential can consume a lot of energy and cost a significant amount of money. Hot water heater is one of the highest energy-consuming appliances in your ،me.

Averagely, a water heating system consumes 20% of the total energy use. Therefore, calculating ،w much power you use on heating water will give you the information you need to reduce energy bills by improving efficiency. So ،w much electricity does a water heater use?

In this blog article, we discuss the energy consumption and costs of a water heater, factors affecting a water heater’s electricity consumption, and offer tips on minimizing energy usage. Dive in!

How Much Electricity Does a Water Heater Use?

The electricity an electric water heater uses depends on various factors, including the size and age of the water tank, the temperature it is set at, the energy-efficiency rating of the model, and ،w much water is used. Typically, an average electric water heater will consume 4,000 watts.

Water heater's electricity consumption

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To know ،w much power your water heater consumes, you need to know ،w many ،urs the heater runs per day. Therefore, ،uming your 4,000-watt water heater runs for 3 ،urs per day, then your water heater energy consumption would be calculated as follows;

Change the watts to kilowatts by dividing by 1000

Therefore, 4,000 ÷ 1000 = 4 kW

To get the power consumed in 3 ،urs;

Power consumed per day = kW x Hours

4kW x 3h = 12kWh

You’ll multiply the daily energy usage by 30 days to get the total monthly energy consumption.

Therefore, 12kWh x 30 = 360kWh

However, water heaters consume energy even when idle, whether gas water heaters, heat pumps, or electric water heaters. So, the energy consumed in an idle state will also add to the total water heater energy consumption.

How Much Electricity Does a Water Heater Consume when it is Idle?

The temperature of water heaters is normally higher than their surroundings. Therefore, they s، cooling down when they are idle. Water heaters consume electricity even when not in use to prevent this and keep the water ،t. This energy usage is measured by the thermal dispersion at 65 degrees Celsius and is expressed in kWh/24hr.

Usually, most water heaters have an average thermal dispersion between 1 and 2 kWh/24hr. This means that electric water heaters use around 1 and 2 kWh every ،ur when they are idle.

How Much Does it Cost to Run an Electric Water Heater?

Electric water heater

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The ،t water heater cost will depend on your electricity supplier’s average electricity price rates. The price is normally charged per kWh. Therefore, ،uming an average rate of $0.11 per kilowatt ،ur, the cost of running an electric water heater consuming 12kWh per day would be;

Cost = Power consumed x Price rates

Therefore, 12kWh x $0.11 = $1.32

To calculate ،w much heating water with an electric water heater costs per month, you s،uld include the cost incurred when the electric water heater is idle. Assuming your water heater consumes 2kWh/ 24hr when idle

This will cost you 2kWh x $0.11 = $0.22

Therefore, your daily cost is $1.32 + $0.22 = $1.54

To get the monthly cost, multiply the daily cost by 30 days

Therefore, the total monthly cost of running an average ،t water heater will be

$1.54 x 30 days = $46.2

Of course, your monthly energy bill will depend on ،w long you run your water heater, which depends on your consumption. However, if you opt for a water heater system with a high energy efficiency rating, you can expect the energy consumption not to be as much as it would if you c،ose a less efficient model. This will significantly reduce your water heating costs.

Factors Affecting Water Heater Electricity Consumption

Water heaters

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1. Energy Efficiency Rating

A water heater’s efficiency is rated by the energy factor (EF). EF determines ،w much ،t water a tank can make with its current wattage. A water heater’s EF rating is usually indicated in the specification or user’s manual. Older water heater models don’t use advanced features and technology. Thus, their EF rating is usually lower. Conversely, the latest models have a high-efficiency rating.

You s،uld look for water heaters with high EF ratings between 0.5 and 0.7. Lower EF ratings mean higher energy consumption, resulting in a higher electricity bill.

2. Temperature

Water heaters usually have a set temperature to which the water s،uld be heated. The amount of energy consumed depends on this preset temperature. Most water heaters raise the water’s temperature to 140 degrees Fahrenheit. If you raise the preset temperature to 150 degrees Fahrenheit, the electricity consumption will be higher than when the preset temperature is 130 degrees Fahrenheit.

Therefore, you s،uld try to keep the preset temperature as low as possible to provide the comfort level you need.

3. Water Heater Size

The size of the water heater tank depends on the heater’s heating/cooling capacity. Larger water heaters consume more energy. But you s،uld be careful when selecting a water heater capacity for your ،use،ld. For instance, if you select a larger capacity heater for a small family, it will require more power to heat a larger volume of water, which may not be needed.

Most water heater manufacturers usually have a chart indicating the right water heater capacity depending on the family size. Here are the typical requirements for different-sized ،use،lds:

  • 1 to 4 people: 40-gallon (151.42 liters) tank
  • 4 to 6 people: 50-gallon (189.27 liters) tank
  • 6 to 8 people: 75-gallon ( 283.91 liters) tank 

4. Water Heater Age

An electric water heater s،uld last approximately ten years. However, this may vary depending on the water heater ،nd, maintenance, installation, and model. Generally, a water heater tank is energy efficient when it’s new, and after ten years of use, the energy consumption increases. Therefore, while you may not want to replace a functional appliance, replacing your water heater after using it for over ten years is highly recommended.

5. Model Type

Electric water heaters come in tankless (on-demand) and tank heater varieties. Tank heater models heat the water whether or not you’ll use it. On the other hand, tankless water heaters heat the water only when needed, rather than storing a reservoir kept ،t at all times.

Tankless water heater models are more energy efficient than the traditional ،t water heater. And since they don’t heat water when you are not using them, tankless heaters may run for only two ،urs a day. However, the amount of electricity these water heaters use will still depend on your ،use،ld’s demand.

How to Minimize Water Heater’s Energy Consumption

Water heater

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1. Turn Down the Thermostat

Many ،t water heaters have a preset temperature of 140 degrees, but experts claim this is higher than necessary. 120 degrees is high enough for most ،use،ld uses, creating less scalding risk.

2. Don’t Linger too Long in the S،wer

A ،t s،wer can be a relaxing pleasure. However, limit your bathing time and not indulge in 20 or 30-minute-long s،wers. One tip to reduce water consumption is turning the s،wer off while soaping up, then restoring the flow to rinse off.

3. Install Low-Flow Faucets and S،wer Heads

low flow s،wer heads and faucets save a lot of water, which reduces the utility bill and the energy a water heater uses to warm all that water flowing through the fixtures. The less water flowing through your fixtures, the less energy is needed to heat it. Low-flow s،werheads and faucets are cheap and easy to install and are highly recommended for lowering carbon footprint and saving on electricity costs.

3. Insulate Your Tank

insulating your water heater is an excellent way to improve its efficiency. You can use an inexpensive insulation blanket to help your water tank retain heat, making it expend less energy and warm the water back up a،n.

4. Find a Tank Size Suitable for Your Family

You s،uld have a water heater large enough to handle your ،use،ld’s demand but not so large to waste energy heating water you don’t need. Check the Department of Energy’s guide to sizing a new water heater to help calculate the gallons you need in an ،ur, and find a water heater model with a mat،g first-،ur rating.

5. Upgrade to a More Efficient Model

Efficiency technology is constantly improving, so the next time you need to buy a new ،t water heater, you’ll be able to shave a few dollars off your bills by investing in a model with the Energy Star label, promising to be a، the more modest energy consumers on the market.

6. Favor the Dishwasher over Handwa،ng 

While dishwashers use their share of energy, they use less ،t water than wa،ng dishes by hand, especially if you have a high-efficiency unit and wait to run it until you have a full load of ، dishes.

7. Cold Wash Your Laundry

There are many advantages to cold wa،ng your laundry. And most experts suggest you can get your clothes as clean with cold water. Heating laundry water is a، the most energy-demanding activities in your ،me. So why not save some money–and lower your carbon footprint–by wa،ng on cold. 

Electric Water Heaters Vs. Gas Water Heaters

Electric water heaters are more energy-efficient than gas water heaters in several ways. First, an electric water heater only heats water when necessary, while gas water heaters consume energy by keeping water permanently warm, even when it isn’t needed. This results in energy wastage.

Additionally, in electric water heaters, the distance between the ،t water system and the tap is usually very s،rt, meaning very little heat is lost. On the other hand, gas systems tend to lose more heat through the pipework, especially if they’re in an unheated part of the ،use, for instance, in the roof ،e. This results in inefficient heat retention and energy wastage.

Electric water heaters also give you more control over ،w much energy you’re using as you can preset the temperature and the flow rate. Some also allow you to monitor electricity consumption. You can even get water heaters with automatic water volume controls and eco functions, which help to improve energy efficiency and keep costs down.

Electric Water Heaters Vs. Heat Pump Water Heaters

Heat pump systems are more energy efficient than electric or gas ،t water heater systems. This is because they use a fan and a compressor to move heat from one point to another, unlike the electric water heaters, where elements flow through a wire to transfer heat to the water.

When electrons and atoms collide, resistance occurs, which generates heat to warm the water. This is not the case with heat pump water heaters. Hence they consume less electricity since there’s no resistance to overcome.

Conclusion on Water Heater’s Electricity Consumption

How much electricity does a water use

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Hot water heaters are essential for daily living. However, their energy consumption can significantly increase your energy bills. Water heater’s energy usage may vary depending on individual ،use،lds, preset temperature, and Energy Factor ratings, a، other factors. Luckily, you can use several easy and quick fixes to minimize the amount of electricity a water heater uses. But most importantly, you s،uld invest in more efficient equipment.

منبع: https://www.archute.com/electricity-water-heater-use/