How Do You Turn Up Heat On Water Heater

Is your shower water lukewarm instead of hot? Your water heater might need a temperature adjustment. This guide walks you through adjusting the temperature on your water heater, covering both gas and electric models. Safety first!

Safety First!

Turn off the power or gas: Before working on your water heater, switch off the breaker for electric heaters or turn the gas valve to the "off" position for gas heaters.
Wear safety glasses: Protect your eyes from debris.
Use insulated tools: Essential when working with electric heaters, even with the power off.
Test the water temperature: After adjusting, test the water at a faucet with a thermometer to ensure it's within a safe range (120°F is generally recommended).
If in doubt, call a pro: Don't hesitate to contact a qualified HVAC technician if you're uncomfortable with any of these steps.

Tools You'll Need

Flathead screwdriver
Phillips head screwdriver
Adjustable wrench
Voltage tester (for electric heaters)
Thermometer
Flashlight

How to Turn Up the Heat on an Electric Water Heater

Electric water heaters typically have two heating elements, each with its own thermostat. You'll need to adjust both for consistent hot water.

Step 1: Locate the Access Panels

Find the access panels on the side of the water heater. They're usually rectangular and secured with screws.

Step 2: Turn Off the Breaker

Go to your electrical panel and switch off the breaker that controls the water heater. Always verify the power is off with a voltage tester before proceeding.

Step 3: Remove the Access Panels

Use a screwdriver to remove the screws and carefully detach the access panels. Be careful not to damage the insulation behind the panels.

Step 4: Remove the Insulation

Gently pull back the insulation to expose the thermostat. Some insulation might be glued or taped in place.

Step 5: Adjust the Thermostat

You'll see a dial or knob with temperature markings. Use a flathead screwdriver to adjust the temperature to your desired setting. 120°F is the generally recommended safe temperature. Make the same adjustment to both thermostats. Some thermostats may have a reset button, if it is tripped you will need to depress it.

Step 6: Reassemble

Carefully replace the insulation and reattach the access panels with the screws.

Step 7: Turn the Breaker Back On

Return to your electrical panel and switch the breaker back on.

Step 8: Test the Water Temperature

Wait a few hours for the water to heat up, then run hot water from a faucet and check the temperature with a thermometer. Adjust the thermostats again if needed.

How to Turn Up the Heat on a Gas Water Heater

Gas water heaters have a single thermostat located behind an access panel at the bottom of the unit.

Step 1: Locate the Gas Control Valve

Find the gas control valve near the bottom of the water heater. It usually has a dial with temperature settings.

Step 2: Turn Off the Gas Supply

Rotate the gas control valve to the "Pilot" position.

Step 3: Remove the Access Panel

Many gas water heaters have a small access panel covering the thermostat dial. Remove this panel (usually held by a screw or clip).

Step 4: Adjust the Thermostat

Turn the thermostat dial to your desired temperature. Again, 120°F is the generally recommended safe temperature.

Step 5: Relight the Pilot Light

Follow the instructions on the water heater to relight the pilot light. This usually involves holding down a button while lighting the pilot with a lighter or igniter.

Step 6: Return the Gas Control Valve to "On"

After the pilot light is lit, turn the gas control valve to the "On" position.

Step 7: Reassemble

Replace the access panel.

Step 8: Test the Water Temperature

Wait a few hours for the water to heat up, then run hot water from a faucet and check the temperature with a thermometer. Adjust the thermostat again if needed.

Troubleshooting Common Problems

No hot water: Check the breaker (electric) or pilot light (gas). Ensure the thermostat isn't set too low. Could be a faulty heating element or gas valve.
Lukewarm water: Thermostat set too low, faulty heating element (electric), or sediment buildup.
Water too hot: Thermostat set too high or a malfunctioning thermostat.
Smelly water: Bacterial growth in the tank. Consider flushing the tank or hiring a professional to sanitize it.
Leaking water heater: This is a serious issue. Turn off the water supply and call a plumber immediately.

When to Call a Professional

While adjusting the water heater temperature is a relatively simple task, some problems require professional help. Call a qualified HVAC technician if:

You're uncomfortable working with electricity or gas.
The water heater is leaking.
You suspect a gas leak.
The water heater is making unusual noises.
The water heater is old (10+ years) and inefficient.
You are unsure of which wire you are testing with the voltage tester.

Maintenance Tips for Your Water Heater

Flush the tank annually: This removes sediment buildup, which can reduce efficiency and damage the tank.
Check the anode rod: The anode rod protects the tank from corrosion. Replace it every few years as needed.
Insulate the water heater: This can help reduce heat loss and lower your energy bills.
Inspect the TPR valve: The temperature and pressure relief (TPR) valve releases excess pressure. Test it periodically to ensure it's working properly.

Estimated Repair Costs

These are rough estimates and can vary depending on your location and the complexity of the repair.

Replacing a heating element (electric): $100 - $300
Replacing a thermostat: $100 - $250
Replacing a gas valve: $200 - $400
Replacing an anode rod: $50 - $150
Flushing the tank (professional): $100 - $200
Replacing a water heater: $800 - $2500+ (including installation)

Always get multiple quotes from qualified HVAC technicians before committing to a major repair or replacement.

Choosing the Right Temperature

The Environmental Protection Agency (EPA) recommends setting your water heater to 120°F. This temperature is hot enough for most household needs while minimizing the risk of scalding and saving energy. Some older models may require a slightly higher setting. However, exceeding 140°F significantly increases the risk of scalding, especially for children and the elderly.

Understanding Your Water Heater's Thermostat

Most thermostats on water heaters aren't precise. They offer a general range, and the actual water temperature may vary slightly. Testing the water temperature with a thermometer is the best way to ensure it's at your desired setting. Don't expect pinpoint accuracy; adjust in small increments and allow time for the water to heat up before retesting.

Energy Efficiency and Water Heater Temperature

Lowering your water heater temperature can significantly impact your energy bill. Every 10°F reduction can save you between 3% and 5% on water heating costs. However, avoid setting the temperature too low, as this can create a breeding ground for bacteria like *Legionella*, which can cause Legionnaires' disease.

Sediment Buildup and Water Heater Performance

Sediment buildup in your water heater tank can act as an insulator, making it harder to heat the water efficiently. This can lead to higher energy bills and reduced hot water capacity. Regularly flushing the tank is crucial for maintaining optimal performance. If you notice rumbling or popping noises coming from your water heater, it's a sign of excessive sediment buildup.

Water Heater Lifespan and Replacement

The average lifespan of a water heater is 8-12 years. If your water heater is approaching the end of its lifespan, it's wise to consider replacing it, even if it's still functioning. Newer models are often more energy-efficient, saving you money in the long run. Signs that your water heater is nearing the end of its life include frequent repairs, rust, leaks, and decreased hot water production.