Restore Performance with a Tankless Replacement

Tankless water heater replacement services for homeowners in Spicewood

Even tankless water heaters eventually wear out. If your system no longer delivers hot water consistently, takes longer to heat up, or displays error codes you cannot clear, it may be time for a replacement rather than another repair. In Spicewood, where hard water and mineral buildup are common, tankless units can develop scale inside the heat exchanger that reduces efficiency and shortens lifespan. Older models may also lack the capacity to keep up with a growing household or fail to meet updated efficiency standards.


Marble Falls Plumbing LLC replaces aging and failing tankless water heaters with newer models that offer improved efficiency, better performance, and longer warranties. The replacement process includes evaluating your existing system to determine whether repair or full replacement makes the most sense, removing the old unit, and installing a new heater that is properly sized for your current household needs. Upgrades may include reconfiguring gas lines, venting, or electrical connections to accommodate a more powerful or efficient model. The work accounts for changes in usage since your original unit was installed and ensures the new system is set up to handle your home's hot-water demand.


Schedule a tankless water heater replacement consultation and speak with Marble Falls Plumbing LLC about restoring dependable hot water in your Spicewood home.

Black kitchen sink with running water, next to a vase with purple flowers, and a window in the background.
Shiny chrome shower fixtures on a white tiled wall, including a temperature control valve and flexible hose.

When to replace instead of continuing to repair

Replacing a tankless water heater begins with diagnosing the current system to understand why it is underperforming. In Spicewood, scale buildup from hard water is a frequent cause of reduced efficiency, but if the heat exchanger is severely damaged or the unit is over ten years old, replacement is often more cost-effective than ongoing repairs. The old unit is disconnected, removed, and replaced with a model that matches or exceeds your household's hot-water needs. If your usage has changed since the original install, the new unit may be sized differently to avoid running out of hot water during peak demand.


After the replacement is complete, you will notice faster hot-water delivery, consistent temperatures across all fixtures, and lower energy bills if upgrading to a more efficient model. Error codes and performance issues disappear, and the new system operates quietly without the rattling or cycling problems that often develop in aging units


The replacement includes testing the new unit under real-world conditions, verifying that gas flow and venting are adequate, and confirming that all safety sensors and controls function correctly. If your home has hard water, recommendations for water treatment or regular descaling may be provided to help extend the life of the new heater. The service does not include structural changes to walls or ceilings, but it does ensure the plumbing and gas connections are safe and up to code.

A close-up of a shower head spraying water with a blurred background.

You probably have a few questions about replacement

Most homeowners want to know whether they should repair or replace, how long the work takes, and what causes tankless systems to fail in the first place.


  • How do I know if my tankless water heater needs to be replaced? Signs include inconsistent hot water, error codes that keep returning after resets, longer wait times for hot water, and visible corrosion or leaks around the unit. If your heater is over ten years old and showing multiple symptoms, replacement is usually the best option.
  • What causes tankless water heaters to fail? Hard water and mineral buildup are the most common causes in Central Texas. Scale accumulates inside the heat exchanger and restricts water flow, forcing the unit to work harder and eventually fail. Lack of regular descaling speeds up this process.
  • How long does a tankless water heater replacement take? Most replacements take four to six hours depending on whether gas lines, venting, or electrical connections need to be modified. You will have hot water restored the same day once the new unit is installed and tested.
  • Why would I need a different size unit than my original? Your household's hot-water usage may have changed since the original install due to more people, added bathrooms, or new appliances. Replacing with a properly sized unit ensures you do not run out of hot water during peak demand times.
  • When should I replace instead of repair a tankless heater? If the repair cost is more than half the price of a new unit, or if your heater is over eight years old and has had multiple service calls, replacement is typically more cost-effective. Newer models also offer better efficiency and longer warranties.


Marble Falls Plumbing LLC has worked with tankless systems throughout Spicewood and understands how local water conditions affect performance and lifespan. Learn more about replacement options and schedule a consultation to restore dependable hot water with minimal downtime.