Water Heater Repair & Replacement in Marble Falls, TX

Tank and tankless water heater service for Highland Lakes homeowners. Hard water expertise, honest pricing, and same-day service available.

Water heater problems are one of the most disruptive plumbing issues a homeowner can face, and in the Highland Lakes region, where extremely hard water dramatically shortens water heater lifespan, they are more common than most homeowners expect. Knockout Plumbing Services provides complete water heater service throughout the Highland Lakes, from emergency repairs and anode rod replacement to full tank and tankless system installation. We understand the specific challenges that Highland Lakes water chemistry poses for water heaters and can help you choose the right system and maintenance approach for your home.

What's Included

Our Process

Diagnosis

We assess your water heater's condition, age, and the nature of the problem to determine whether repair or replacement is the better value.

Recommendation

We explain your options honestly, including the pros and cons of repair vs. replacement and tank vs. tankless, with no pressure toward the more expensive option.

Service or Installation

We complete the repair or installation efficiently, including proper disposal of the old unit and testing of the new system.

Hard Water Protection

We advise on anode rod maintenance, sediment flushing schedules, and water softener options to maximize the lifespan of your new water heater.

Hard Water and Water Heaters: A Costly Combination

No plumbing appliance is more affected by the Highland Lakes’ hard water than the water heater. Understanding how hard water damages water heaters, and what you can do about it, is essential for any Highland Lakes homeowner who wants to get the most out of their investment.

The water in Marble Falls, Kingsland, Burnet, and surrounding communities is classified as “very hard” to “extremely hard” by water quality standards, with mineral content typically ranging from 300 to 400 parts per million. This water is rich in dissolved calcium and magnesium, minerals that are harmless to drink but highly damaging to plumbing appliances and fixtures.

When hard water is heated, the dissolved minerals become less soluble and precipitate out of the water as solid calcium carbonate, the same material that forms limestone and stalactites. In a water heater, this precipitation creates a layer of scale on the heating element (in electric heaters) and a layer of sediment on the bottom of the tank (in gas heaters). Both forms of buildup reduce the efficiency of the water heater and accelerate its deterioration.

The efficiency impact is significant. A water heater with a quarter-inch layer of scale on its heating element uses approximately 40% more energy to heat the same amount of water as a clean heater. A gas water heater with two inches of sediment in the bottom of the tank may use 25-30% more gas than a clean unit. Over the course of a year, this wasted energy adds up to a meaningful increase in utility costs, often enough to justify the cost of professional descaling or early replacement.

The lifespan impact is even more significant. In most parts of the country, a standard tank water heater lasts 10-12 years. In the Highland Lakes, where hard water attacks the tank from the inside and the anode rod depletes faster than in soft water areas, a lifespan of 6-8 years is typical without proper maintenance. With annual sediment flushing, regular anode rod replacement, and a water softener, that lifespan can be extended to 10-12 years, a significant return on a modest investment in maintenance.

Tank vs. Tankless: Choosing the Right System for Highland Lakes Conditions

Traditional Tank Water Heaters

Traditional tank water heaters store 30-80 gallons of hot water in an insulated tank, keeping it ready for use at all times. They are less expensive to purchase and install than tankless systems, and they are compatible with all home plumbing configurations without modification. The disadvantages in Highland Lakes conditions are significant: the large volume of hard water sitting in the tank continuously deposits minerals, sediment accumulates rapidly, and the anode rod depletes faster than in soft water areas.

For homeowners who choose a tank water heater in the Highland Lakes, we strongly recommend annual sediment flushing, anode rod inspection every 2-3 years, and the installation of a water softener to reduce the mineral load on the tank. These maintenance steps can extend the lifespan of a tank water heater to 10-12 years even in hard water conditions.

Tankless Water Heaters

Tankless water heaters, also called on-demand or instantaneous water heaters, heat water only when it is needed, eliminating the standby heat loss of a tank system. They are 20-30% more energy efficient than tank heaters, they provide unlimited hot water on demand, and they have a much longer service life, typically 15-20 years with proper maintenance.

The primary challenge of tankless water heaters in the Highland Lakes is scale buildup in the heat exchanger. The heat exchanger is a compact assembly of small-diameter passages through which water flows while being heated. In hard water conditions, scale accumulates rapidly in these passages, reducing flow rate and heat transfer efficiency. Without regular descaling, typically annually in Highland Lakes conditions, a tankless water heater can fail within 3-5 years.

The solution is a combination of a water softener and annual descaling service. A water softener removes the calcium and magnesium minerals from the water before it enters the water heater, dramatically reducing scale buildup. Annual descaling service, which involves circulating a descaling solution through the heat exchanger, removes any scale that does accumulate. With these maintenance measures in place, a tankless water heater in the Highland Lakes can achieve its full 15-20 year service life.

For most Highland Lakes homeowners who plan to stay in their home for more than 5 years, a tankless water heater with a water softener is the better long-term investment. The higher upfront cost is offset by lower energy bills, longer service life, and the elimination of the recurring cost of tank replacement every 6-8 years.

Water Heater Maintenance for Highland Lakes Homeowners

Proper maintenance is the key to getting the most out of your water heater in Highland Lakes conditions. The following maintenance schedule is appropriate for most Highland Lakes homes:

Recommended water heater maintenance schedule for Highland Lakes homes:

Annually: Sediment flush (tank heaters) or descaling service (tankless heaters). This is the single most important maintenance task for water heaters in hard water areas.

Every 2-3 years: Anode rod inspection and replacement if needed. In Highland Lakes conditions, anode rods deplete faster than the manufacturer’s standard recommendation.

Every 3-5 years: Pressure relief valve test and replacement if needed. The pressure relief valve is a critical safety device that prevents tank overpressure.

As needed: Thermostat adjustment, element replacement (electric heaters), and burner cleaning (gas heaters).

We offer water heater maintenance service throughout the Highland Lakes. A maintenance visit typically takes 1-2 hours and includes sediment flushing, anode rod inspection, pressure relief valve test, and a general condition assessment. Call (325) 248-1800 to schedule maintenance or to discuss the right maintenance plan for your specific water heater.

Water Heater Installation: What to Expect

When it is time to replace your water heater, whether due to age, failure, or an upgrade to a more efficient system, Knockout Plumbing Services handles the complete installation process. We remove and dispose of the old unit, install the new system to code, test all connections and safety devices, and verify the system is operating correctly before we leave.

For gas water heater installations, we inspect and test the gas line connection and verify proper venting. For tankless installations, we assess whether the existing gas line is sized appropriately for the higher BTU demand of a tankless system, many homes require a gas line upgrade when switching from a tank to a tankless heater. For electric water heaters, we verify that the electrical circuit is properly sized for the new unit.

We carry common water heater sizes in stock and can typically complete a same-day replacement for standard tank water heaters. Tankless installations and gas line upgrades may require scheduling a separate visit. Call (325) 248-1800 to discuss your water heater needs and get an honest assessment of your options.

Water Heater Service Throughout the Highland Lakes

Knockout Plumbing Services provides complete water heater service throughout the Highland Lakes region, including Marble Falls, Kingsland, Burnet, Horseshoe Bay, Llano, Granite Shoals, Meadowlakes, Spicewood, Bertram, and surrounding communities. We are a licensed plumbing company (RMP #45640) with over 17 years of experience serving Highland Lakes homeowners and businesses.

When you call us for water heater service, you get honest advice on repair vs. replacement, straightforward pricing, and work done correctly the first time. We understand the specific challenges of hard water on water heaters in this region and can help you make the best decision for your home and budget. Call (325) 248-1800 to schedule service.

Frequently Asked Questions

How long do water heaters last in the Highland Lakes?

In most parts of the country, a standard tank water heater lasts 8-12 years. In the Highland Lakes, where water hardness is typically 300-400 ppm, the lifespan is often shorter, 6-8 years is common without proper maintenance. The minerals in hard water accumulate as sediment in the bottom of the tank, reducing efficiency and accelerating corrosion. Annual sediment flushing and regular anode rod replacement can extend the lifespan .

What are the signs that my water heater needs to be replaced?

The most reliable signs that replacement is needed include: the unit is more than 8-10 years old, rust-colored water from the hot water tap, rumbling or popping noises from the tank (indicating heavy sediment buildup), water pooling around the base of the unit, and consistently inadequate hot water. If your water heater is leaking from the tank itself, not from a fitting or valve, replacement is almost always the right answer.

Should I get a tankless water heater?

Tankless water heaters offer significant advantages: they provide unlimited hot water on demand, they are 20-30% more energy efficient than tank heaters, and they have a much longer lifespan, 15-20 years vs. 6-10 years for tank heaters in Highland Lakes conditions. The main considerations are higher upfront cost and the need for a water softener or regular descaling service to prevent mineral buildup in the heat exchanger. For most Highland Lakes homeowners who plan to stay in their home for more than 5 years, a tankless system with a water softener is the better long-term investment.

Why is there sediment in my water heater?

The hard water in the Highland Lakes contains high concentrations of calcium and magnesium minerals. When this water is heated, the minerals precipitate out of solution and settle to the bottom of the tank as a layer of sediment. Over time, this sediment layer insulates the bottom of the tank from the burner, forcing the burner to work harder and longer to heat the water. This reduces efficiency, increases energy costs, and accelerates corrosion of the tank bottom. Annual sediment flushing removes this buildup and extends the life of the water heater.

What is an anode rod and why does it matter?

An anode rod is a sacrificial metal rod, typically magnesium or aluminum, that is installed in the water heater tank to protect the steel tank walls from corrosion. The anode rod corrodes preferentially, sacrificing itself to protect the tank. In hard water conditions like the Highland Lakes, anode rods deplete faster than in soft water areas. A depleted anode rod leaves the tank walls unprotected and allows corrosion to begin. We recommend inspecting and replacing the anode rod every 2-3 years in Highland Lakes conditions.

My water heater is making a popping or rumbling noise. What does that mean?

Popping and rumbling noises from a water heater are almost always caused by sediment buildup in the bottom of the tank. As the burner heats the water, it also heats the sediment layer, causing water trapped in the sediment to boil and pop. This is a sign that the sediment buildup is significant and that the water heater is working much harder than it should. A sediment flush may resolve the problem if the tank is not yet corroded, but in many cases this level of buildup indicates that replacement is the better option.

Can you install a water heater the same day?

In most cases, yes. We keep common water heater sizes in stock and can typically complete a same-day replacement for standard tank water heaters. Tankless installations may require a separate visit for gas line or electrical work if upgrades are needed. Call (325) 248-1800 and we will let you know what is possible for your specific situation.

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