Centennial homeowners generally replace a water heater when the tank leaks, recovery slows to a crawl, or an aging unit needs one repair after another. The City of Centennial Building Division requires a permit for any work on plumbing or gas systems. Call the number on this page to be connected with a local plumber in Centennial.
What's different about Centennial
The city doesn't run a water utility. Water and sewer come from a set of special districts, among them Southgate, Willows, Arapahoe County Water and Wastewater Authority, East Cherry Creek Valley and Inverness. Much of the city's water arrives through Denver Water distributors such as Southgate and Willows, and Denver Water's 2026 report lists average hardness around 105 ppm for that supply. Other districts use their own sources, so your district's report is the one to check.
The City of Centennial Building Division, at the Civic Center on East Arapahoe Road, requires a permit for any work on plumbing, gas or mechanical systems, which covers a water heater replacement. The installer usually handles the paperwork. Xcel Energy is the gas utility; if you smell gas, leave the house, then call 911 and Xcel at 1-800-895-2999.
Comparing your choices
| Choice | Upside | Trade-off |
|---|---|---|
| Standard gas tank | Familiar, fits most existing setups | Standby heat loss; limited by tank size |
| High-efficiency gas tank | Lower operating cost | May need different venting |
| Tankless | Continuous hot water, frees floor space | Gas line and vent upgrades are common |
| Electric or heat pump | No combustion venting | Electrical capacity and space requirements |
Warning signs
- Moisture or rust streaks at the bottom of the tank
- Hot water that smells metallic or looks cloudy and brown
- A heater that cycles constantly but never quite catches up
- Repairs to the same unit more than once in a year or two
Seasonal timing
Winter is the hardest season on a tank in Centennial because incoming water is colder and the burner runs longer. If your heater is showing its age by fall, replacing it before the first deep freeze avoids a cold-shower emergency and gives you time to compare quotes. Spring and summer are good windows for bigger changes, like moving to tankless or relocating the unit, since a day without hot water is easier to manage.
If the old tank has already failed, shut the cold supply valve on top, turn off the gas or breaker, and keep an eye on any nearby finished drywall or carpet. Call your water district if the leak won't stop at the house valve, since the curb shutoff belongs to the district rather than the city.
Water Heater Replacement questions in Centennial
Does a water heater replacement here need a permit, and who issues it?
How do I find out which water provider serves my address?
Who do I call if the water has to be shut off at the street?
Can the new heater go in a different location?
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