Hot Water That Never Runs Out

Tankless water heater repair, service, installation and replacement in Boulder, Colorado.

If you live in Boulder and your household runs out of hot water during back-to-back showers or while running the dishwasher and laundry at the same time, a tankless water heater solves that problem by heating water on demand. DNI Heating and Air repairs, services, installs and replaces tankless systems for homes and businesses that need a continuous supply of hot water.


Tankless water heaters heat water only when you turn on a faucet or appliance, eliminating the need for a storage tank. They are ideal for larger homes or families with high hot water demand because they provide an endless supply as long as the unit is properly sized for the home. DNI Heating and Air services and repairs most makes and models, addressing issues such as mineral buildup, ignition failures, and flow sensor malfunctions common in Boulder's water conditions.


If you want to learn more about switching to a tankless system or need service on an existing unit in Boulder, contact DNI Heating and Air to schedule a consultation.

How a Tankless Water Heater Installation Works

During installation in your Boulder home, DNI Heating and Air evaluates your hot water usage, the number of fixtures, and the fuel source to size the unit correctly. The technician mounts the tankless unit on a wall, connects it to the gas or electric supply, and integrates it with your existing plumbing lines. Venting is installed to safely exhaust combustion gases if the unit runs on gas.


Once the system is running, you will notice hot water arrives within seconds of opening a tap and continues without interruption no matter how many showers or appliances are in use. Tankless water heaters offer an endless supply of hot water whereas tank water heaters rely on the supply in the tank. You no longer wait for the tank to refill and reheat between uses.


DNI Heating and Air also handles descaling and filter replacement during routine maintenance visits, which keeps the heat exchanger clear and prevents hard water deposits from reducing efficiency. Tankless systems require more frequent servicing in areas with mineral-heavy water, but the tradeoff is never running out of hot water during peak demand. The section below covers practical questions about performance and maintenance.

White tankless water heater mounted on a dark gray wall, with connected pipes and valves.

What Homeowners Usually Want to Know

People in Boulder often ask how tankless systems compare to traditional tanks, what size unit they need, and how often maintenance should be performed to avoid breakdowns.

What size tankless water heater do I need for my home?

You need a unit sized by gallons per minute based on how many fixtures or appliances run simultaneously. DNI Heating and Air calculates your peak demand during the consultation to recommend the correct model for your Boulder home.

How long does a tankless water heater last?

Tankless units typically last fifteen to twenty years with proper maintenance, which is longer than most tank water heaters. Regular descaling and filter changes extend the lifespan and maintain efficiency.

Why does my tankless water heater show an error code?

Error codes indicate issues such as ignition failure, restricted venting, or mineral buildup in the heat exchanger. DNI Heating and Air diagnoses the code and repairs the specific component causing the problem.

Can a tankless water heater keep up with multiple showers at once?

Yes, if the unit is properly sized for your household's peak demand. Tankless water heaters are great for homes with a high demand of hot water, including larger homes or bigger families in Boulder.

How often should a tankless water heater be serviced?

Annual descaling is recommended, especially in areas with hard water. DNI Heating and Air flushes the heat exchanger with a descaling solution to remove mineral deposits and maintain consistent output.

DNI Heating and Air works with residential and commercial customers throughout Boulder who need reliable tankless water heater service, whether that means repairing an existing unit or installing a new system sized for higher demand. Reach out to discuss your hot water needs and schedule a service visit.