Tankless Water Heater
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Expert Tankless Water Heater Installation and Repair Services in Noblesville, IN and the Surrounding Areas

Thornton Plumbing, HVAC & Electrical installs and services tankless water heaters in Noblesville, IN and surrounding Indianapolis communities, bringing expertise built since 2006. Our licensed, bonded, and insured plumbers, holding Indiana Plumbing License PC11500008, size and install on-demand systems that deliver unlimited hot water while reducing energy costs by up to 30 percent compared to tank units. We are BBB A+ Rated, provide upfront transparent pricing, and back all tankless installations with strong warranties. Financing is available for qualifying upgrades, and emergency service is available 24 hours a day. Call 317-697-9265 for a free tankless water heater estimate in Noblesville.
Tankless Water Heater Installation and Repair Services in Noblesville, IN

Tankless water heaters are also known as “on demand” or “instant” water heaters because rather than storing heated water in a tank, they heat it upon your request. While tankless water heaters tend to cost a bit more upfront, they offer a variety of benefits that you won’t see with a traditional water heater.

They got the job done professionally and efficiently

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“Thornton Plumbing, HVAC & Electrical was a life saver! they came out to fix a broken pipe on my water heater. I highly recommend, they got the job done professionally and efficiently. Will defiantly be calling again when any issues arise."
- Robert Pruitt
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Benefits of Tankless Water Heaters

Expert Tips
- Lisa Arbuckle
Consider the energy-saving benefits of a tankless water heater for a continuous and on-demand hot water supply. This efficient alternative provides convenience and reduces energy consumption, contributing to a more eco-friendly home.
- Lisa Arbuckle
  • Better Efficiency – Tank water heaters are constantly losing energy as the heated water sits around unused inside the tank. Because tankless water heaters don’t keep a supply of hot water on hand, no energy will be lost storing it. While a traditional water heater might be around 70% efficient, a tankless water heater will be around 98% efficient, and this energy savings will be reflected in your utility bills!
  • No Running Out of Hot Water – With a traditional water heater, you are at risk of running out of hot water if you use too much. You’ll have to wait a substantial amount of time for your water heater to heat up more water. With a tankless water heater, the water as heated instantly when you need it, so there will never be a point when you are simply out of hot water.
  • Takes Up Less Space – Those huge water heater tanks take up a lot of space in your basement or utility room, but tankless water heaters are much smaller and can even be mounted in a variety of spaces, so that you’ll have more room for other things!
  • Longer Lifespan – Tankless water heaters are built to last a long time and they tend to last longer than traditional water heaters. A tankless water heater could last up to 20 years, whereas a tank water heater might be lucky to make it to 15 years.

Professional Installation for Lasting Performance

A tankless water heater must be installed correctly to work at its full potential. Improper sizing, poor venting, or incorrect connections can shorten the life of the unit and lead to costly problems. Thornton Plumbing, HVAC & Electrical’s certified technicians ensure your system is sized for your home’s water demand and installed with precision. We also evaluate your plumbing and electrical setup to make sure everything supports your new tankless system. With our expertise, homeowners avoid the frustrations of low water pressure, inconsistent temperatures, or premature breakdowns. Proper installation means you can rely on your tankless water heater to deliver steady hot water every time you need it.

Expert Repair for Tankless Water Heaters

Even reliable tankless units may need service when components wear out or issues arise. Signs of trouble include fluctuating water temperature, reduced flow, or error codes on the system display. Thornton Plumbing, HVAC & Electrical’s repair team is trained to diagnose problems quickly and restore performance without unnecessary delays. From clogged filters and ignition problems to faulty sensors, we handle all types of repairs with the goal of extending the life of your unit. We carry the tools and parts needed to get your hot water back on track quickly, so your family can enjoy the comfort of reliable service without disruption.

Why Choose Us

Choosing the right contractor is as important as choosing the right water heater. Families in Noblesville turn to Thornton Plumbing, HVAC & Electrical because we combine decades of plumbing experience with a focus on honest, reliable service. We understand the unique water quality challenges in the area and how they affect tankless water heaters. Our team explains options clearly, provides professional recommendations, and ensures every installation or repair meets the highest standards. With Thornton Plumbing, HVAC & Electrical, you get more than just technical expertise, you gain a trusted partner who cares about your comfort, safety, and long-term satisfaction.

For tankless water heater installation in Noblesville or the surrounding areas, give our certified plumbers a call at 317-697-9265. We’ll help you to choose the tankless water heater that will be the perfect fit for your home. You can also count on Thornton Plumbing, HVAC & Electrical for tankless water heater repairs, regardless of where you purchased your unit.

Frequently Asked Questions

A tankless water heater heats water on demand as it flows through the unit rather than storing a pre-heated supply in a tank. When a hot water tap opens, cold water enters the unit, passes through a heat exchanger, and exits at the set temperature. Water is only heated when actually needed.
A tank water heater stores a fixed amount of hot water and continuously maintains its temperature even when no hot water is being used. A tankless unit heats water only when a tap is opened, eliminating standby heat loss. Tankless units are smaller, tend to last longer, and use less energy over time.
A properly sized tankless water heater provides continuous hot water as long as demand does not exceed the unit's flow rate capacity. Running multiple high-demand fixtures simultaneously could exceed a single unit's output if it is not sized correctly for that level of use. Proper sizing prevents this.
Tankless units use more sophisticated technology and require precise installation including potentially upgraded gas lines and specific venting. Their higher upfront investment is partially offset over time through lower energy consumption since they do not maintain a heated tank around the clock.
A properly sized tankless water heater provides continuous hot water without a recovery period. Unlike a tank system that can be depleted by back-to-back showers, a tankless unit heats water continuously for as long as the tap is open, so there is no waiting for the tank to refill.
Thornton Plumbing, HVAC & Electrical installs Navien tankless water heaters. Navien features industry-leading technology for on-demand hot water in both condensing and non-condensing configurations.
Yes. Tank water heaters lose energy continuously maintaining stored water at temperature. Tankless units do not have standby heat loss. A tankless water heater operates at approximately 98 percent efficiency when heating water, compared to around 70 percent for a typical tank unit.
Tankless water heaters have a longer service life than tank units. A well-maintained tankless unit can last up to 20 years. A tank water heater typically lasts 10 to 15 years. The longer lifespan is one factor in the overall value of the tankless investment.
Tankless water heaters are significantly smaller than tank units and are wall-mounted, which frees up floor space in utility areas. They can be installed in spaces that would not accommodate a traditional tank.
Error codes on a tankless water heater indicate a specific fault condition the unit has detected. Thornton Plumbing, HVAC & Electrical services Navien units and can diagnose error codes, identify the underlying cause, and complete the appropriate repair.
Yes. Thornton Plumbing, HVAC & Electrical repairs tankless water heaters regardless of where the unit was purchased or originally installed. The team can diagnose and complete repairs for units installed by others.
Sizing a tankless unit means matching its flow rate output to the household's peak hot water demand. A unit that is too small cannot meet demand when multiple fixtures run simultaneously. A licensed plumber calculates the right size based on how many fixtures are likely to run at once and the temperature rise needed.
Lukewarm output when multiple fixtures run simultaneously means the unit is operating at or beyond its rated capacity. The unit is heating more water than it is designed to handle at that rate, resulting in reduced temperature. This is a sizing situation that can be evaluated and addressed.
Yes. Tankless water heaters benefit from periodic descaling to remove mineral deposits from the heat exchanger, especially in hard water areas. The inlet filter screen should be cleaned periodically. Annual professional service helps maintain performance and extend the unit's life.
Yes. The compact wall-mounted design makes tankless units well suited for homes with limited utility space. They can be installed in closets, small utility rooms, garages, and other locations where a large tank would not fit.
Hard water increases the rate of scale buildup inside the heat exchanger. This can affect performance over time if not addressed through maintenance or water treatment. Installing a water softener alongside a tankless unit significantly reduces scale and helps protect the unit's performance.
Tankless installation includes evaluating the home's gas supply capacity or electrical setup depending on the unit type, verifying or installing appropriate venting, making supply connections, programming the unit, testing operation across multiple fixtures, and confirming performance is correct under normal household demand.
A very brief odor when a gas appliance ignites initially can be normal in some cases. A persistent burning smell, a sulfur odor that does not clear, or a smell that intensifies is not normal and should be investigated by a licensed technician before the unit is used further.
Tankless water heaters have higher peak gas demand than tank units because they heat water on demand at a high rate. A licensed plumber evaluates the existing gas supply line size and meter capacity as part of the installation assessment to confirm the supply can support the new unit.
Yes. Cold inlet water requires more energy to reach the set output temperature, which affects the effective flow rate. Thornton Plumbing, HVAC & Electrical factors in local inlet water temperatures when sizing tankless units for Noblesville area homes to ensure the unit performs adequately year-round including during cold winter months.
Cold bursts during a tankless shower can happen when a fixture is briefly turned off and on, causing the unit to shut down and restart before the heat exchanger is back up to temperature. It can also be caused by a flow sensor issue. A service call can identify and address the specific cause.
Navien tankless water heaters are designed for approximately 20 years of service life when properly maintained. Regular descaling, filter screen cleaning, and periodic professional service support reaching that longevity.
Yes. The team can review your household's hot water demand, evaluate the home's existing gas line or electrical setup, and explain the trade-offs between tankless and tank options clearly so you can make an informed decision.
Reduced pressure from hot water outlets specifically after a tankless installation can be caused by a partially closed valve, a flow restrictor in the unit, an undersized gas line limiting the unit's firing rate, or a filter screen that needs cleaning. A technician can identify the specific cause.
Call Thornton Plumbing, HVAC & Electrical at 317-697-9265 for service. Emergency water heater service is available year-round. The team can diagnose and repair the unit or arrange for a replacement if needed.
Yes. Gas tankless water heaters require direct vent or power vent configurations with specific venting materials and installation requirements different from traditional tank water heater venting. Correct venting is critical for safe operation and is evaluated as part of every installation.
A properly sized whole-home tankless unit can supply hot water to all fixtures in most residential situations. Sizing is based on the maximum number of hot water fixtures likely to run simultaneously and the flow rate each requires. Very large homes with high simultaneous demand may benefit from a second unit.
Yes. Thornton Plumbing, HVAC & Electrical services tankless water heaters regardless of where or by whom they were installed. The team can diagnose the issue and complete needed repairs.
A traditional tank water heater typically operates at around 70 percent efficiency due to standby heat loss. A tankless unit operates at approximately 98 percent efficiency when heating water because it does not maintain a stored supply. The energy savings over the unit's life is a significant part of the value proposition.
Call 317-697-9265 to schedule an assessment with Thornton Plumbing, HVAC & Electrical. The team evaluates your home's setup, recommends the right Navien unit, and handles the complete installation including gas line evaluation, venting, and final testing.
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