Upgrading to a tankless water heater gives you on-demand hot water without the standby energy loss of a storage tank, a significantly longer equipment lifespan, and space savings that matter in smaller mechanical rooms. For Denver-area homeowners, the efficiency gains are real — but so are a few installation considerations specific to Colorado’s altitude and hard water that are worth understanding before you commit.

Endless Hot Water — Actually Endless

A traditional tank water heater stores 40 to 80 gallons of hot water. When that supply runs out, you wait. A tankless unit heats water on demand as it flows through the heat exchanger, so there is no tank to deplete. For households with multiple bathrooms, back-to-back showers, or a dishwasher and washing machine running simultaneously, this is the most tangible day-to-day benefit.

The caveat: a single tankless unit has a maximum flow rate — typically measured in gallons per minute. In Colorado’s cold winters, incoming groundwater temperatures drop significantly, which reduces the temperature rise a unit can deliver at high flow rates. Sizing matters. A unit that works fine in summer may struggle to keep up with two simultaneous showers in January if it was undersized for your home’s peak demand.

Lower Energy Bills Over Time

Tank water heaters cycle on and off all day to maintain water temperature — even at 2 a.m. when no one is using hot water. That standby heat loss is a constant draw on your gas or electric bill. Tankless units eliminate standby loss entirely, which typically translates to meaningful energy savings, especially in homes where hot water usage is spread throughout the day rather than concentrated in a single morning rush.

Gas tankless units are particularly efficient and well-suited to Colorado, where natural gas is the dominant fuel for home heating and water heating. High-efficiency condensing tankless models extract additional heat from exhaust gases, pushing efficiency ratings well above standard units.

Longer Lifespan and Lower Long-Term Cost

A conventional tank water heater typically lasts 8 to 12 years. A well-maintained tankless unit can last 20 years or more. The upfront cost of a tankless system is higher, but spread over its lifespan, the math often favors tankless — particularly when you factor in the avoided cost of replacing a tank unit midway through the tankless unit’s life.

That lifespan advantage depends on maintenance. Colorado’s hard water is aggressive on tankless heat exchangers. Mineral scale builds up inside the unit and must be flushed annually with a descaling solution. Skipping this service can cut the unit’s lifespan dramatically. Done’s water heater maintenance program keeps tankless units running efficiently year after year.

Space Savings and Installation Flexibility

Tankless units are wall-mounted and compact — roughly the size of a large suitcase — compared to a 50-gallon tank that takes up a significant footprint in a utility room or basement. That recovered space is genuinely useful in townhomes, condos, and older Denver homes where mechanical rooms are tight.

  • On-demand hot water with no recovery wait time
  • Elimination of standby energy loss
  • 20-year lifespan versus 8–12 years for a tank unit
  • Wall-mounted design frees floor space in utility areas
  • High-efficiency condensing models available for maximum gas savings

Altitude and Hard Water: Colorado-Specific Considerations

At Denver’s elevation, gas combustion behaves differently than at sea level, and tankless units must be properly sized and calibrated for altitude. An improperly configured unit can underperform or produce incomplete combustion. Done’s plumbers are experienced with Front Range installations and know how to spec and set up tankless units correctly for Colorado conditions.

If you’re weighing the switch, Done offers free estimates and financing options to make the upfront investment manageable. Learn more about what’s involved on our tankless water heater page, or explore water heater replacement options if your current tank is nearing the end of its life.