How do I turn my hot water system down?

Turning down your hot water system is a straightforward process that can save energy and money. Most systems have an adjustable thermostat, typically located on the unit itself, which you can simply set to a lower temperature. It’s important to find a balance, ensuring the water is still hot enough for your needs while avoiding unnecessary energy consumption.

Why Lower Your Hot Water System Temperature?

Adjusting the temperature of your hot water system offers several compelling benefits. Primarily, it leads to significant energy savings. Heating water is a major contributor to household energy bills, and even a small reduction in temperature can translate into noticeable cost savings over time.

Reducing Energy Consumption and Costs

The U.S. Department of Energy suggests that lowering your water heater’s thermostat by 10–15°F can reduce energy use by 3–5%. This might seem minor, but it adds up. For example, if your water heater accounts for 15% of your utility bill, a 5% reduction in its energy use could save you money on your monthly statement.

Enhancing Safety

A lower water temperature also enhances household safety. Scalding is a serious risk, especially for children and the elderly. By reducing the maximum temperature, you significantly decrease the chance of accidental burns from faucets or showerheads.

Environmental Benefits

Beyond personal savings, turning down your hot water system contributes to a greener footprint. Less energy used means fewer greenhouse gas emissions from power plants. This is a simple yet effective way to support environmental sustainability.

How to Turn Down Your Hot Water System: A Step-by-Step Guide

The process for adjusting your hot water system’s temperature varies slightly depending on the type of heater you have, but the general principles remain the same. Always prioritize safety and consult your owner’s manual if you’re unsure.

Locating the Thermostat

Most water heaters have a thermostat control directly on the unit. For electric water heaters, you’ll typically find two thermostats, one for the upper heating element and one for the lower. They are usually behind access panels. For gas water heaters, the thermostat is often a dial located near the bottom of the tank, usually behind a small access door.

Adjusting the Temperature Setting

Once you’ve located the thermostat, you can adjust the temperature.

Gas Water Heaters: Look for a dial with temperature settings or numbers. Common settings might range from "Vacation" or "Low" to "Hot" or "High." Aim for a setting that corresponds to around 120°F (49°C).
Electric Water Heaters: You’ll likely need to remove an access panel to reach the thermostats. Use a flathead screwdriver to carefully turn the dial to your desired temperature. Again, 120°F (49°C) is a widely recommended setting.

Important Note: Always turn off the power to an electric water heater or shut off the gas supply to a gas water heater before attempting to adjust the thermostat. This is a crucial safety precaution.

Recommended Temperature Settings

While personal preference plays a role, experts recommend setting your water heater to 120°F (49°C). This temperature is hot enough for most household needs, including washing dishes and laundry, while minimizing scalding risks and energy waste. Some older recommendations suggested 140°F (60°C), but this is now considered unnecessarily high for most homes.

Testing the Water Temperature

After making adjustments, it’s essential to test the water temperature. Run a hot water tap for a minute or two to allow the water to reach the heater’s set temperature. Use a thermometer to check the temperature at the faucet. This ensures your adjustment has had the desired effect and the water is at a safe and effective temperature.

Different Types of Hot Water Systems and Adjustments

The method for turning down your hot water system can differ based on whether you have a tank-style heater, a tankless system, or a heat pump water heater.

Tank-Style Water Heaters (Gas and Electric)

As described above, these are the most common. You’ll directly adjust the thermostat on the unit. For electric models, remember to turn off the circuit breaker first. For gas models, locate the control valve and dial.

Tankless Water Heaters

These systems heat water on demand. They often have digital controls on the unit itself or can be controlled remotely via an app. You can typically set a precise temperature. Reducing the temperature here also saves energy, as less water is heated to a higher degree than necessary.

Heat Pump Water Heaters (Hybrid)

These are highly energy-efficient systems. They use electricity to move heat from the air to the water. They also have digital controls where you can adjust the temperature setting. While very efficient, lowering the temperature will still contribute to further energy savings.

Common Issues and Troubleshooting

Sometimes, you might encounter minor issues when adjusting your hot water system.

Thermostat Not Responding

If the thermostat doesn’t seem to be working, it might be faulty. This is more common in older units. You may need to call a plumber or appliance repair technician to diagnose and replace the thermostat.

Inconsistent Water Temperature

If your water temperature fluctuates significantly after an adjustment, it could indicate a problem with the heating elements (electric) or the burner assembly (gas). It might also suggest sediment buildup in the tank, which can affect heating efficiency. Regular water heater maintenance is key here.

Error Codes on Digital Displays

Modern tankless and heat pump water heaters often display error codes. Consult your owner’s manual to understand what these codes mean and if they relate to temperature settings or other operational issues.