Hot Water On Demand Without the Tank

Professional tankless water heater installation for homeowners in Spicewood

Switching to a tankless water heater changes how your home delivers hot water. Instead of keeping 40 or 50 gallons heated around the clock, a tankless system heats water only when you turn on a tap or appliance. In Spicewood, where energy costs add up and many homeowners are looking for ways to save space and reduce waste, tankless systems offer a practical alternative to traditional storage tanks. They fit in smaller spaces, last longer, and eliminate the risk of a tank rupturing and flooding your utility room.


Marble Falls Plumbing LLC installs gas tankless water heaters designed to provide on-demand hot water for busy households, lake homes, and properties with high usage. The installation process is more involved than a standard tank replacement because it requires upgrades to gas lines, venting, and sometimes electrical systems to support the unit's higher demand. Proper sizing is critical, and the decision depends on how many fixtures might run simultaneously, the groundwater temperature in your area, and whether you need one unit for the whole house or dedicated units for specific zones. The system is mounted on a wall, connected to existing plumbing, and configured to deliver consistent hot water year-round.


Explore tankless water heater installation options and reach out to Marble Falls Plumbing LLC to discuss whether a tankless system fits your home in Spicewood.

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.

Why tankless systems require a different approach to install

Installing a tankless water heater involves more than swapping out an old tank. Gas tankless units require larger gas lines to supply the burner with enough fuel, and venting must be upgraded to handle higher exhaust temperatures. In Spicewood, where homes vary in age and construction, this often means running new gas pipe from the meter and installing stainless steel venting through an exterior wall or roof. The unit itself mounts on a wall in the garage, utility room, or outside, freeing up floor space previously occupied by a tank. Electrical connections power the control board and ignition system.


Once installed, you will notice that hot water arrives quickly at every fixture, showers can run longer without the water turning cold, and your energy bills drop because the system only heats water when needed. The unit itself takes up minimal space and eliminates the risk of a tank leak flooding your home.


The installation includes calculating the correct size based on flow rate and temperature rise, upgrading infrastructure to meet the unit's specifications, and testing the system under typical usage conditions. If your home has hard water, a water softener or descaling system may be recommended to prevent mineral buildup inside the heat exchanger. Tankless systems are designed to support busy households and properties with multiple bathrooms, but they perform best when sized and installed correctly from the start.

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

Here is what homeowners want to know first

Before committing to a tankless system, most people have questions about how it compares to a tank, what the installation requires, and whether it will work for their household.


  • What makes tankless water heaters more efficient? Tankless systems only heat water when you use it, so you are not paying to keep a tank hot all day and night. This can reduce energy costs by 20 to 30 percent compared to a traditional storage tank heater.
  • How long does a tankless water heater installation take? Most installations take a full day because of the additional work required for gas line upgrades, venting, and electrical connections. The exact timeline depends on your home's existing infrastructure and whether any modifications are needed.
  • Why do gas lines need to be upgraded? Tankless water heaters have higher BTU ratings than tank heaters, and the existing gas line may not deliver enough fuel to support the burner. Upgrading the line ensures the unit operates at full capacity without starving other gas appliances in your home.
  • What size tankless water heater do I need? The size depends on how many fixtures might run at once and the temperature of incoming groundwater in Spicewood. A household that regularly runs two showers and a dishwasher at the same time needs a larger unit than one with staggered usage patterns.
  • When should I consider a tankless system over a traditional tank? Tankless systems make sense if you want to save space, improve energy efficiency, or avoid the risk of a tank leak. They work well for homes with high hot-water demand or for homeowners planning to stay in their home long enough to see the energy savings add up.


Marble Falls Plumbing LLC has installed tankless water heaters in homes throughout Spicewood, including lakeside properties and suburban neighborhoods with varying infrastructure needs. Contact us today to discuss whether a tankless system is the right fit for your household.