Tankless Water Heater Installation in Castle Rock, CO

On-Demand Tankless Hot Water Solutions for the South Metro area

The technology of heating water has advanced far beyond the large, inefficient tanks of the past. A tankless water heater, also known as an on-demand system, heats water instantly as needed, rather than paying to keep 40 or 50 gallons hot 24/7. This approach provides an endless supply of hot water, saves significant energy, and can last nearly twice as long as a conventional tank water heater. 

This upgrade is a popular choice for efficiency-minded homeowners in the South Metro area. 

Rock Plumbing, Heating, Air & Electrical has been a trusted, family-owned company serving the Castle Rock area for over two decades.  We possess the specialized knowledge necessary to accurately install these systems, encompassing both the essential gas line upgrades and the precise calibrations required for our high-altitude environment.   

To schedule your tankless water heater installation in Castle Rock, CO, call Rock Plumbing, Heating, Air & Electrical at (720) 410-5239 or contact us online.

How Do Tankless Water Heaters Work?

Unlike a traditional heater that stores and constantly reheats a fixed volume of water, a tankless system operates only when hot water is specifically requested:

• A hot water tap is turned on.
• Cold water flows into the unit and passes over a flow sensor.
• The sensor activates a high-powered gas burner or electric element.
• A heat exchanger instantly transfers heat to the water as it passes through the system.
• The unit delivers a continuous, endless supply of hot water until the tap is turned off, at which point the unit shuts down completely.

This process eliminates "standby energy loss," which is the energy a tank heater wastes as it continually reheats its stored water throughout the day. Due to this operating principle, tankless systems are highly efficient, which in turn reduces your monthly utility bills.

Upgrading from a Tank to a Tankless System

Can you replace your old tank with a new tankless model? Absolutely. However, it is essential to understand that it is not a simple swap. 

A proper conversion requires a few key upgrades that Rock Plumbing, Heating, Air & Electrical will manage, including:

• Venting requirements. Gas tankless units demand specialized, dedicated venting. Unlike many old tank heaters that share a flue with the furnace, a tankless unit needs its own sealed vent, often routed directly through a side wall.
• Gas line sizing. This is the most critical part of the installation. A tankless heater uses a powerful burner (up to 200,000 BTUs) to heat water instantly. This requires a much larger volume of natural gas than a standard tank heater. In most cases, Rock Plumbing, Heating, Air & Electrical will need to upgrade the diameter of the gas pipe running to the unit to confirm it operates safely and effectively.
• Sizing for Colorado's climate. Sizing a tankless unit differs significantly from sizing a traditional tank. It is not about gallons; it is about flow rate (GPM) and temperature rise. The "temperature rise" is the difference between the cold water entering your home and your desired hot water (e.g., 120°F). Because our groundwater in Castle Rock is extremely cold, we require a high-power unit that can withstand a significant temperature rise to provide consistent hot water for your showers and appliances.

Advantages of Tankless Water Heaters

Many homeowners in Castle Rock are making the switch from traditional tank water heaters to modern tankless systems—and for good reason. Tankless water heaters offer an impressive range of benefits that improve comfort, efficiency, and long-term savings.

• Increased Energy Efficiency: One of the biggest advantages of tankless water heaters is their ability to heat water only when it’s needed. Unlike traditional tank systems that continuously heat and store water, tankless units operate on demand. As a result, homeowners can reduce energy usage by as much as 24–34% compared to standard tank water heaters, making tankless systems a more energy-efficient solution.
• Lower Utility Bills: Because tankless water heaters consume less energy, they can significantly reduce monthly utility costs. On average, Castle Rock households can save hundreds of dollars per year, conserving approximately 27–50% more energy than traditional tank water heaters. These ongoing savings quickly add up, helping offset the initial installation cost.
• Extended Lifespan: Tankless water heaters are also built to last longer than conventional systems. While traditional tank water heaters typically last 10–15 years, tankless systems can operate efficiently for up to 25 years or more. With regular professional maintenance, your tankless water heater can achieve its maximum lifespan and performance.
• Space-Saving Design: Another major benefit of tankless water heaters is their compact size. Traditional tank models often hold 40–60 gallons of water and require substantial space—often standing around 60 inches tall and 24 inches wide. In contrast, tankless water heaters are much smaller, usually measuring about 28 inches tall, 20 inches wide, and 10 inches deep. This space-saving design frees up valuable room in your basement, utility closet, or garage.
• Reduced Maintenance Requirements: Although all water heaters require maintenance, tankless systems generally demand less intensive upkeep than traditional tank heaters. When you choose tankless water heater installation, our certified team will help schedule professional tune-ups and maintenance services to ensure your system remains efficient, reliable, and long-lasting.

Frequently Asked Questions About Tankless Water Heater Installation

Where Can I Have My Tankless Water Heater Installed?

You can install your tankless water heater in any location that provides access to adequate combustion air and allows the heater exhaust to be correctly vented to the outdoors. The unit should not be installed outdoors if the home or business is in a colder climate.

Is It Worth It to Install a Tankless Water Heater?

It is definitely worth installing a tankless water heater because it delivers an endless supply of hot water, frees up storage space, and significantly reduces energy bills.

Should I Install Multiple Tankless Water Heaters?

For larger households, installing two tankless systems or selecting a single, larger model may be necessary, particularly if your household uses more than 85 gallons of hot water per day. For smaller families, one unit is sufficient.

How Much Does a Tankless Water Heater Cost?

The bulk of the expense of installing a new tankless water heater lies in the actual installation process. While the units themselves cost a fair amount, the labor and necessary upgrades represent the real cost. Contact Rock Plumbing, Heating, Air & Electrical today to receive a quote and schedule the installation of your new tankless water heater.

My Old Water Heater Ruptured and Flooded My Basement. Can This Happen With a Tankless Water Heater?

No, a tankless water heater will not rupture and flood your basement, as it does not have a large holding tank. That being said, there is a small potential for your tankless water heater to leak, which, if left unnoticed, could still cause minor damage.

How Long Do Tankless Water Heaters Last?

With proper care and routine maintenance, tankless water heaters can last up to 25 years or more. Scheduling regular maintenance with a trusted expert helps ensure your system operates efficiently, minimizes wear and tear, and reaches its maximum lifespan.

Will Tankless Water Heaters Work With Hard Water?

Yes, tankless water heaters can operate effectively with hard water. However, if your home has hard water, it is highly recommended to install a water softener or water treatment system upstream of the water heater. This helps prevent mineral buildup, extends the lifespan of your tankless system, and reduces how often professional servicing is needed.

To get started with your tankless water heater installation in Castle Rock, CO, call Rock Plumbing, Heating, Air & Electrical at (720) 410-5239 or contact us online.