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When was the last time you checked your water heater’s temperature setting? Most homeowners never think about it—until the water’s too hot, not hot enough, or their utility bills start creeping higher each month. Setting your water heater to the right temperature isn’t just about comfort—it’s about saving money and ensuring safety in your home.
Why Water Heater Temperature Matters
Your water heater works constantly to keep a reservoir of hot water ready for showers, dishwashing, laundry, and more. But if it’s set too high, it wastes energy—and that means you’re paying for heat you don’t actually use. On the other hand, if it’s too low, bacteria such as Legionella (which can cause Legionnaires’ disease) can grow inside the tank, creating a health risk.
The temperature you choose affects:
Energy efficiency: Higher temperatures mean your water heater must work harder, using more electricity or gas.
Safety: Extremely hot water increases the risk of scalding, especially for children and older adults.
Longevity of your system: Overheating can cause mineral buildup and stress on internal components, shortening your water heater’s lifespan.
The Ideal Water Heater Temperature Setting
The U.S. Department of Energy recommends setting your water heater to 120°F (49°C). This temperature strikes the perfect balance between energy savings, safety, and comfort.
Here’s why 120°F is ideal:
Prevents scalding: At this setting, the water is hot enough for daily use but not dangerously hot.
Saves energy: Lowering your water heater from 140°F to 120°F can reduce standby heat losses by up to 10%.
Prevents bacteria growth: It’s warm enough to inhibit most harmful bacteria while still being efficient.
Protects plumbing and appliances: Excessive heat can damage rubber seals and shorten the lifespan of dishwashers, washing machines, and other fixtures.
Signs Your Water Heater Temperature Needs Adjustment
You might need to check your water heater setting if you notice any of the following:
Inconsistent water temperatures (too hot or too cold)
Higher-than-normal energy bills
Discolored or smelly water, which may indicate bacterial growth
Shortage of hot water, suggesting your tank isn’t heating efficiently
Adjusting the thermostat on most water heaters is simple, but if you’re unsure how to do it safely—or if your unit’s performance seems off—it’s best to have a professional take a look.
Safety First: Avoid DIY Mistakes
While adjusting your water heater temperature sounds straightforward, accessing the controls often involves dealing with electrical or gas components. A small mistake can lead to electric shock, gas leaks, or system damage. It’s always safest to call a licensed technician to handle the adjustment and ensure your water heater is running efficiently.
Save Energy and Protect Your Home
Your water heater accounts for roughly 18% of your home’s energy use. By keeping it at 120°F and maintaining it regularly, you can enjoy consistent hot water, lower utility bills, and peace of mind knowing your system is safe and efficient.
If you’re unsure what temperature your water heater is set to—or if you’ve noticed inconsistent water temperatures—it might be time for a professional inspection.
Call Centennial Plumbing, Heating & Electrical Today
Don’t waste money heating water you’ll never use. Contact Centennial Plumbing, Heating & Electrical today at (306) 500-7392 to have your water heater professionally inspected, adjusted, and maintained for optimal performance and savings. Our licensed experts are ready to help you keep your home safe, comfortable, and energy efficient all year long.