Can you replace my water heater the same day in Highlands Ranch?

Usually. Most replacements are done the same day they're quoted, and the old unit is hauled away. Call or text (720) 818-5569 and tell us gas or electric and roughly how old it is.

How hard is the water in Highlands Ranch?

Hard. Highlands Ranch Water says it typically measures 11 to 13 grains per gallon (about 188 to 222 mg/L), and 2025 quarterly averages ranged from 74 to 263 mg/L. That's enough to shorten a water heater's life without regular flushing.

Do you work on gas and tankless water heaters in Highlands Ranch?

Yes. We repair and replace gas and electric water heaters, tank and tankless. Tankless heaters scale up quickly in water this hard. Descale at least once a year, or install a softener ahead of it.

Does a water heater in Highlands Ranch need a high-altitude rating?

A gas one does. Highlands Ranch's USGS reference point is about 5,696 feet, so a gas tank heater has to be certified for that altitude (the rating plate or altitude label shows it), and a tankless heater has to be set for it at installation. Electric water heaters don't need an altitude rating.

Water Heaters in Highlands Ranch, CO: Repair & Replacement

Q: How long do water heaters last in Highlands Ranch?

A tank water heater typically lasts about 8 to 12 years, and a tankless unit longer with regular descaling. Highlands Ranch Water says its water typically measures 11 to 13 grains per gallon (about 188 to 222 mg/L), with 2025 quarterly averages from 74 to 263 mg/L. Sediment builds fast. Flush every 6 to 12 months, check the anode every couple of years, and descale tankless units at least yearly. A softener usually pays off.

Highlands Ranch has hard water and a lot of houses from the 1990s. Both are hard on water heaters.

Highlands Ranch water heaters at a glance

Water provider	Highlands Ranch Water (Centennial Water & Sanitation District), mostly South Platte snowmelt treated at the Blake plant
Water hardness	Hard, and it changes with the season: 2025 quarterly averages ranged from 74 to 263 mg/L. The district says water typically measures 11 to 13 grains per gallon.
Homes	Median year built 1998, and 44% of homes were built in the 1990s. The first residents moved in in 1981.
Elevation	About 5,696 feet (USGS reference point)
For your water heater	Sediment builds fast. Flush every 6 to 12 months, check the anode every couple of years, and descale tankless units at least yearly. A softener usually pays off.

Sources: Highlands Ranch Water hardness · Highlands Ranch Water 2026 report · Census ACS 2019–2023 via Point2Homes · USGS elevation. Checked October 2026.

What Highlands Ranch's water does to a water heater

When water is heated, the calcium and magnesium in it drop out as sediment and settle on the bottom of the tank. The burner or lower element then has to heat through that layer, so the heater runs longer, pops and rumbles, and wears faster. Highlands Ranch Water says its water typically measures 11 to 13 grains per gallon (about 188 to 222 mg/L), with 2025 quarterly averages from 74 to 263 mg/L. Sediment builds fast. Flush every 6 to 12 months, check the anode every couple of years, and descale tankless units at least yearly. A softener usually pays off.

1990s houses and hard water

Highlands Ranch's first residents moved in in 1981, and nearly half of its homes went up in the 1990s. Those houses are on their second or third water heater, and at 11 to 13 grains of hardness a tank that's never been flushed fills with sediment fast. That's why a Highlands Ranch heater often pops and rumbles before it fails. If you're replacing one here, it's worth pairing the new heater with a softener, especially if it's tankless.

Repair or replace?

Under about eight years old, with a failed part like a thermocouple, gas valve, heating element, or thermostat, a repair usually makes sense. At about ten years or older, or with any leak from the tank itself, replacement is the better money: a leaking tank can't be fixed. You get the price before any work starts, and most replacements are done the same day they're quoted, with the old unit hauled away. A replacement is also the time to check whether you need an expansion tank (when one is required).

Gas or electric, tank or tankless

We repair and replace both gas and electric water heaters, standard tanks and tankless units. Tankless heaters scale up quickly in water this hard. Descale at least once a year, or install a softener ahead of it.

At about 5,696 feet (Highlands Ranch's USGS reference point), a gas water heater has to be rated for the altitude, and a tankless heater set for it at installation. That's above 5,400 feet, where Rinnai and Navien change their tankless settings, though elevations vary across the city. What to check at altitude.

Make the next one last

Flush the tank every 6 to 12 months
Check the anode rod every couple of years and replace it before it's gone
Install a softener: at this hardness it protects the heater and every fixture
Know where the cold-water shutoff on top of the heater is, and how to turn the heater off, before you need to

More reading: water heater leaking? what to do, no hot water troubleshooting, how long water heaters last in Colorado, why a water heater pops or rumbles, and water hardness by city. If your water is hard, a softener protects the heater and every fixture.