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Will Turning Up The Water Heater Make Hot Water Last Longer?

There is nothing worse than stepping into your shower after a long, hard day at the office and having icy shower water hit you instead of the blessed hot water you were expecting. Roommate, sibling, spouse, child—whoever it was that used up all the hot water is enemy number one in your eyes.

In an ideal world, everyone would have endless access to hot water when they expect to. While we don’t live in an ideal world, there are still a couple of things that can be done to ensure this—including turning the water heater up. But why does this work and what are the potential drawbacks? Here, I answer these questions and more.

Turning up the water heater temperature makes hot water last longer as the desired temperature is reached by using less hot water and more cold water. The recommended maximum temperature should be 120 °F. Hotter water poses risks to users and the water heater and increases energy bills.

Water Heaters Have Set Capacities

Unfortunately, you physically cannot increase the amount of hot water that you have access to because hot water heaters have set water storage capacities, so once the limit has been reached, it cannot be exceeded.


However, by increasing the temperature of the water, you do make it last longer and we will discuss why and how in the next section.

The Hotter the Water the Less You Use

When you take a shower and a bath, you tend to use both hot and cold water—unless the water heater is set at such a low temperature that you only use the hot water. In such cases, you will definitely finish the hot water really quickly.

However, when you increase the temperature of the hot water that comes from your water heater, you are able to alter the ratio of hot water to cold water. You will be using more cold water to reduce the heat and achieve your desired temperature.

This means that all the hot water that is in your water heater will actually be used at a much slower rate, and consequently last longer.

Problems With Increasing Water Heater Temperature

While increasing the temperature of the water in your water heater helps to solve the issue of running out of hot water, it does create other problems, particularly if you increase the temperature too much.

Increased Energy Consumption and Cost

Increasing your water heater temperature may allow you to have more hot water for longer, but it will definitely cost you.

By increasing the temperature that you want your hot water to be, you are in essence adding a lot more pressure to the water heater to heat up the water in the tank as required. It will take a bit longer to heat up the water, which increases your energy consumption.

Woman increasing the temperature of the water heater, increasing temperature might extend the availability of hot water but would cost you.jpg

As a result, you will see your energy bill hike up quite dramatically. If you are fortunate enough to be able to handle the added expense, then you will be able to enjoy the hot water without much stress.

However, most people will not appreciate the surprise of a doubled energy bill and may choose to keep the temperature a bit lower rather than face the brunt of the rising cost.

Higher Burn Risk (Particularly for Kids)

As an adult, if the water that comes out of the showerhead or water faucet is too hot to handle, you can easily switch off the tap or turn on the cold water to ease the burn. You might be left with some red skin but you will probably be okay due to your fast reflexes.

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However, as a child, there is a higher risk of getting burned by the water. Toddlers can play around in the bath and may turn on the hot water faucet in the process, which can result in a nasty burn, even if you are there watching them. All it takes is a moment.

Research shows that the maximum temperature for household hot water is around 149 °F (65 °C), such a temperature that can cause a scalding burn in less than 3 seconds.

Bathing your baby or toddler in such hot water, or letting them wash their hands with it, can definitely cause some painful burns that will probably need to be treated by a medical professional.

But it’s not just babies. If your 8-year-old was suddenly being blasted by boiling hot water, they might not have the presence of mind to react in a way that will minimize the damage to their bodies.

Reduced Water Heater Lifespan

Another consequence of increasing the water temperature in your water heater is that you will be reducing the life span of the appliance.

The average lifespan of a water heater is around 10 years, provided you keep it in good condition by providing regular maintenance for the appliance.

When the temperature is set too high, the water heater will be working overtime to heat up the water as required. This means that it will be working a lot more than it needs to, putting a lot of pressure on its components, thus reducing its functionality.

Additionally, if your water heater temperature is set too high, you are at risk of overworking the heater, which can result in the tank exploding. Yes, you read it right. Your water heater can explode and cause a huge amount of damage to your home, which will be extremely costly. This is a result of excessive pressure build-up in the tank.


It is, therefore, in your best interest to reduce the temperature as required so that you save yourself the cost of either replacing the water heater a couple of years prematurely or the expense of replacing it in addition to fixing the damage caused by an exploded heater.

Recommended Maximum Water Temperature

The maximum water temperature that you are recommended to set your water heater at is dependent on the climate you’re in, the brand of your water heater, the reason for your water heater usage, as well as the age of the family members or users of the water.

In general, the safest water heater temperature is 120 °F (± 50 °C). This means that you should set the temperature at less than that to avoid burns. It may be beneficial to check that your water heater is not automatically set to a higher temperature, as is the case with some manufacturers.

It will be in your best interest to turn the temperature down as necessary to avoid any consequences of such a high temperature.

How to Turn up the Water Heater Temperature

If your water heater temperature is significantly lower than the recommended temperature, then you may be considering adjusting the setting on the water heater, as long as the lower temperature is not a result of a malfunctioning heating element in your water heater.

Luckily, it is not too difficult of a process to do yourself, so you won’t need to waste money on a professional.

In general, all you will have to do is to locate the dial that controls the temperature of your water heater. You will then just rotate it towards your desired temperature.


On most water heaters, there are numbers on or around the dial that will indicate the temperature of your water. These numbers usually range from about 90 °F to 160 °F (32 °C to 70 °C). Be careful not to turn the dial all the way to the maximum temperature due to the dangers that can accompany such hot water.

On other water heaters, there might not be numbers indicated. This will require you to manually take the temperature of your water a few times as you adjust until you find the required temperature.

It might be beneficial to write on your water heater the temperature you have measured, so you know for future instances.

An Alternative: Go Tankless

Another option that can provide you with more hot water, is to switch to a tankless water heater.

These are great appliances that provide hot water on demand as the water is heated immediately as you require it, instead of being heated and then stored in a tank. This means that you will essentially have an endless supply of hot water—no more fighting with your roommates over who will shower first to get the hot water.

Some benefits of having a tankless water heater include:

  • These water heaters are much smaller, which means you are able to fit them into even the most compact of spaces.
  • You can actually end up saving water as you won’t be waiting for the hot water to come out of your tap before using it. Tankless water heaters immediately release hot water, so there is a limited lag time.
  • You will save on your energy costs as your water heater won’t be continuously heating up water. Tankless water heaters only heat the water as needed.
  • Tankless water heaters tend to have a longer lifespan than water heaters with tanks as there are fewer parts to maintain or replace when broken.
  • Tankless water heaters require significantly less maintenance than other water heaters. Instead of servicing the appliance every 6 months, you can go as long as 5 years without needing to do any maintenance.

On the other hand, there are some drawbacks to having a tankless water heater.

  • Unfortunately, when it comes to tankless water heaters, you won’t be able to install the machine yourself as it is quite a complex job. This means you will have to fork over the money to hire a professional to do it.
  • If the water heater element is not completely submerged in water at all times, it can quickly burn out and fail.
  • Tankless water heaters use quadruple the current of ordinary water heaters, so there is a higher risk of overloading the electrical circuit.
  • Gas tankless water heaters bring about the risk of carbon monoxide poisoning which have a variety of health consequences.


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