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Tankless Water Heater Services in Hewitt, TX

No hot water? Tankless unit showing an error code? Water temperature fluctuating? Thinking about replacing a tank water heater with tankless?

Hardison Heat, Air & Plumbing provides tankless water heater services throughout Hewitt, including the Hewitt Drive and I-35 areas, homes near Warren Park and Hewitt Park, and the surrounding McLennan County countryside. We serve properties across the city and nearby country areas in McLennan County. Call Hardison to schedule service at your property.

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Tankless water heaters can provide efficient, on-demand hot water, but they still require proper sizing, installation, maintenance, and diagnosis when something goes wrong.

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We’ll determine what is causing the problem before recommending repair or replacement.

Jason's Tip:

An error code tells you where to start looking — it doesn’t always tell you exactly what failed.

Tankless water heaters monitor several operating conditions and may display a code when something is outside the expected range.

That code can be helpful, but the actual cause may involve water flow, gas supply, venting, ignition, sensors, scale buildup, electrical components, or another part of the system.

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Diagnose the cause before replacing parts.

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Common Tankless Water Heater Problems

Call us if your tankless water heater is experiencing:

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  • No hot water

  • Water that is not getting hot enough

  • Hot water that suddenly turns cold

  • Fluctuating water temperature

  • Tankless water heater error codes

  • Unit repeatedly shutting down

  • Delayed hot water

  • Ignition problems

  • Burner problems

  • Reduced hot-water flow

  • Unusual noises

  • Water leaking from the unit

  • Scale or mineral buildup

  • Frequent resets

  • Problems after a power interruption

  • Problems when multiple fixtures are being used

  • A unit that will not start when hot water is requested

  • Recurring service problems

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Some symptoms can have several possible causes, which is why proper diagnosis matters.

Professional Tankless Water Heater Diagnosis

Tankless systems rely on several components working together.

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Depending on the problem, diagnosis may include evaluating:

  • Water flow

  • Incoming water temperature

  • Hot-water temperature

  • Flow sensors

  • Temperature sensors

  • Ignition system

  • Burner operation

  • Gas supply

  • Gas pressure where applicable

  • Venting

  • Air intake

  • Electrical supply

  • Control components

  • Heat exchanger condition

  • Scale buildup

  • Water filters or inlet screens

  • Condensate drainage on applicable units

  • Error-code history

  • Installation conditions

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The goal is to determine why the unit is having trouble before deciding what needs to be repaired.

Most Common Thing We See in the Field:
Assuming the tankless water heater needs to be replaced just because it has an error code.

An error code is information.

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It may point toward ignition, airflow, water flow, overheating, sensors, venting, scale buildup, or another operating condition.

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That doesn’t automatically mean the entire water heater is bad.

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A proper diagnosis should determine what caused the code and whether the problem can reasonably be repaired.

- Jason Hardison

Tankless Water Heater Repair

Many tankless water heater problems can be repaired depending on the age, condition, and availability of parts.

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Possible repairs may involve:

  • Ignition components

  • Sensors

  • Water-flow components

  • Filters or screens

  • Control components

  • Valves

  • Electrical components

  • Gas-related components

  • Venting concerns

  • Condensate components

  • Scale-related problems

  • Leaking connections

  • Other serviceable components

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We’ll explain what failed and give you repair options before work begins.

Tankless Water Heater Error Codes

Modern tankless water heaters use built-in diagnostics to identify operating problems.

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An error code may be related to:

  • Ignition failure

  • Flame detection

  • Insufficient gas supply

  • Restricted airflow

  • Venting problems

  • Water-flow problems

  • Overheating

  • Temperature sensors

  • Scale buildup

  • Exhaust conditions

  • Electrical problems

  • Control-system faults.

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The code helps narrow down the problem, but it still needs to be interpreted along with what the system is actually doing.

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Simply clearing a code without correcting the cause may result in the same problem retur

💡 Jason's Recommendation:

If the tankless unit keeps giving the same error code, find out why before repeatedly resetting it.

Resetting the system may temporarily restore operation, but if the same condition keeps returning, the water heater is telling you something is wrong. Recurring codes deserve diagnosis.

Fix the cause rather than making the reset button part of your daily routine.

Tankless Water Heater Descaling & Maintenance

Minerals naturally found in water can accumulate inside a tankless water heater over time.

This is especially important in areas with harder water.

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Scale can affect the heat exchanger and may contribute to:

  • Reduced efficiency

  • Restricted water flow

  • Temperature problems

  • Longer heating times

  • Unusual noises

  • Overheating

  • Error codes

  • Premature wear

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Tankless water heaters should be maintained according to the equipment manufacturer’s recommendations and the conditions of the water supply.

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Maintenance may include:

  • Descaling the heat exchanger

  • Cleaning inlet filters or screens

  • Checking for leaks

  • Inspecting accessible connections

  • Evaluating venting

  • Checking condensate components where applicable

  • Verifying operation

  • Confirming proper temperature

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Homes with harder water or heavier usage may require maintenance more frequently.

Tankless Water Heater Installation

Installing a tankless water heater involves more than simply removing a tank and hanging a new unit on the wall.

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A proper installation may require evaluating:

  • Household hot-water demand

  • Required flow rate

  • Incoming water temperature

  • Temperature rise

  • Number of fixtures that may operate simultaneously

  • Gas supply capacity

  • Gas piping size

  • Venting requirements

  • Combustion air

  • Electrical requirements

  • Water piping

  • Drainage

  • Condensate disposal where applicable

  • Equipment location

  • Manufacturer installation requirements

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The tankless water heater needs to be properly matched to the home and installed as a complete system.

Proper Tankless Water Heater Sizing

One of the most important parts of choosing a tankless water heater is determining how much hot water the home may need at one time.

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A tankless unit has to raise incoming water to the desired temperature while maintaining enough flow for the fixtures being used.

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Sizing may take into account:

  • Number of bathrooms

  • Showers

  • Bathtubs

  • Kitchen usage

  • Washing machine

  • Dishwasher

  • Simultaneous hot-water demand

  • Incoming groundwater temperature

  • Desired outlet temperature

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An undersized tankless water heater may struggle when several fixtures are used at once.

Going tankless works best when the equipment is selected for the way the household actually uses hot water.

Gas Supply for Tankless Water Heaters

Gas tankless water heaters can require a substantial amount of fuel while operating.

Before installing one, the existing gas system may need to be evaluated to determine whether it can properly supply the new equipment along with the home's other gas appliances.

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That may involve considering:

  • Existing gas piping size

  • Distance from the gas supply

  • Other gas appliances in the home

  • Total connected load

  • Available gas supply

  • Manufacturer requirements

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A tankless conversion should not assume that the gas line serving an existing tank water heater is automatically appropriate for the new equipment.

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If gas piping changes are needed, we can explain those requirements as part of the installation.

Learn About Gas Line Repair

Tankless Water Heater Venting

Gas-fired tankless water heaters require proper venting and combustion-air provisions according to the equipment and installation.

Depending on the type of unit, venting may differ significantly from a traditional tank-style water heater.

Improper venting can cause operating problems and may create a safety concern.

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When installing or evaluating a tankless system, we consider:

  • Vent material

  • Vent size

  • Vent routing

  • Intake and exhaust requirements

  • Termination location

  • Manufacturer requirements

  • Existing installation conditions

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Venting should be treated as part of the water-heater system — not an afterthought.

Converting From a Tank Water Heater to Tankless

Homeowners often ask whether they can replace a conventional storage-tank water heater with a tankless system.

In many homes, the answer is yes, but the conversion needs to be evaluated first.

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A tank-to-tankless conversion may require changes to:

  • Gas piping

  • Venting

  • Electrical supply

  • Water piping

  • Equipment location

  • Condensate drainage

  • Exterior penetrations

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That’s why we prefer to evaluate the installation before telling someone a tankless conversion will be simple.

We’ll explain what would actually be required for your home.

Tankless vs. Traditional Tank Water Heaters

Neither system is automatically right for every home.

Tankless Water Heaters

Potential benefits may include:

  • On-demand hot water

  • No large storage tank

  • Compact installation

  • Reduced standby heat loss

  • Longer service potential when properly maintained

  • Continuous hot water within the unit’s rated capacity

Considerations include:

  • Higher initial installation cost

  • Possible gas-line modifications

  • Venting requirements

  • Regular maintenance

  • Proper sizing is important

  • More complex controls and components

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Tank Water Heaters

Potential benefits may include:

  • Lower initial installation cost in many homes

  • Simpler equipment

  • Straightforward replacement when existing installation is suitable

  • Stored hot-water capacity

Considerations include:

  • Limited stored hot water

  • Larger physical footprint

  • Standby heat loss

  • Tank deterioration over time

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We’ll help you understand the differences rather than automatically recommending one type over the other.

Learn About Water Heater Repair & Replacement

Tankless Water Heater Repair vs. Replacement

A problem with a tankless water heater does not automatically mean replacement is necessary.

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Repair May Make Sense When:

  • The unit is otherwise in good condition

  • The failure is isolated

  • Replacement parts are available

  • The heat exchanger is serviceable

  • The repair cost is reasonable

  • The system has been properly installed

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Replacement May Make Sense When:

  • The unit has significant age or deterioration

  • Major components have failed

  • The heat exchanger has failed

  • Multiple problems are occurring

  • Parts are obsolete or unavailable

  • Repair costs are becoming excessive

  • The system has a history of repeated failures

  • The existing unit is improperly sized for the home

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We’ll explain what we find so you can decide which option makes the most sense.

Leaking Tankless Water Heaters

A tankless water heater can leak from several locations.

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Possible sources include:

  • Water connections

  • Valves

  • Internal components

  • Drain connections

  • Condensate components

  • Heat exchanger

  • Nearby piping

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The location of the water matters.

A leaking connection may be repairable, while a failed heat exchanger or major internal leak can change the repair-versus-replacement decision.

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Find the source before assuming the entire unit needs replacement.

Hot Water Turns Cold During a Shower

Intermittent temperature problems can happen for several reasons.

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Possible causes may include:

  • Water-flow changes

  • Unit capacity

  • Scale buildup

  • Sensor problems

  • Fixture-flow characteristics

  • Gas-supply issues

  • System controls

  • Installation conditions

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If the problem occurs repeatedly, we can evaluate how the water heater behaves under actual demand and determine what may be causing the temperature change.

What Happens During a Tankless Water Heater Installation?

A typical installation process may include:

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Evaluate the Home

We review the existing water heater, hot-water needs, piping, gas or electrical requirements, venting, and equipment location.

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Select Appropriate Equipment

The water heater should be sized for the household’s expected demand.

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Determine Required Modifications

We identify any changes needed to gas piping, water piping, venting, electrical supply, or drainage.

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Install the Tankless Water Heater

The equipment is installed according to applicable requirements and manufacturer specifications.

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Start and Test the System

We verify operation, check for leaks, confirm hot-water production, and make sure the equipment is operating as intended.

 

Explain the System

We’ll go over basic operation and important maintenance considerations with you.

Do We Install Customer-Purchased Tankless Water Heaters?

To make sure every tankless system is properly sized, installed, and supported, Hardison Heat, Air & Plumbing provides the equipment we install rather than installing customer-supplied units.

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This allows us to evaluate the home, select equipment that fits the application, verify gas, venting, electrical, and plumbing requirements, and stand behind the complete installation.

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It also helps avoid situations where a water heater is purchased before anyone confirms that it is the right size or setup for the home.

Preventive Tankless Water Heater Maintenance

A little attention can help protect a tankless system.

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Follow Recommended Descaling Intervals

Mineral buildup can affect the heat exchanger and water flow.

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Keep Inlet Screens Clean

Restricted water flow may interfere with proper operation.

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Don't Ignore Error Codes

Repeated codes deserve diagnosis.

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Watch for Leaks

Small leaks should be addressed before they create additional damage.

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Pay Attention to Temperature Changes

Changes in performance may be an early sign of a developing problem.

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Have the System Evaluated When Needed

Gas supply, venting, combustion, controls, and water flow all affect how the system operates.

Financing Available for Tankless Water Heaters

Tankless water heater replacement or installation can be a larger home investment, particularly when a conversion requires changes to gas piping, venting, electrical service, or water piping.

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Hardison Heat, Air & Plumbing offers financing options for qualifying water heater installations and plumbing projects to help make necessary work more manageable.

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We’ll explain the equipment, installation requirements, and pricing first so you can decide what makes the most sense for your home and budget.

Why Choose Hardison Heat, Air & Plumbing?

Tankless water heaters combine plumbing, electrical controls, gas systems, venting, and water heating into one piece of equipment.

Proper diagnosis and installation matter.

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Hardison Heat, Air & Plumbing brings 34 years of plumbing and HVAC experience to homes throughout Central Texas.

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Homeowners choose Hardison for:

  • Tankless water heater diagnostics

  • Tankless water heater repair

  • Tankless replacement

  • New tankless installation

  • Tank-to-tankless conversions

  • Descaling and maintenance

  • Gas-line evaluation

  • Water heater diagnostics

  • Traditional tank water heater service

  • Honest repair-versus-replacement recommendations

  • Upfront pricing before work begins

  • No unnecessary upselling

  • Family-owned and locally operated service

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Our goal is to determine what the system actually needs before recommending repair or replacement.

 

Customer Reviews on Google

Selected excerpts from customer reviews of Hardison.

 

“Super friendly, easy to work with and was incredibly efficient.”

Brooks Anthony · 5-star Google review

Read on Google

 

“The pricing felt fair and he took the time to explain what was needed and why, and the long term impacts!”

Karin Wolfe · 5-star Google review

Read on Google

Areas We Serve
Tankless Water Heater Services Throughout Hewitt, TX

We provide tankless water heater services throughout Hewitt and nearby rural properties in McLennan County. These are examples of the areas we serve:

  • Homes throughout Hewitt
  • Hewitt Drive and nearby residential areas
  • Homes around the I-35 corridor
  • Homes near Warren Park and Hewitt Park
  • Other Hewitt neighborhoods and nearby rural McLennan County properties

We also serve Waco, Woodway, Robinson, and surrounding McLennan County communities. Whether you’re in a neighborhood or outside town, call Hardison to discuss service at your property.

Frequently Asked Questions

Do you repair tankless water heaters?

Yes. We diagnose and repair many tankless water heater problems, including error codes, ignition problems, temperature issues, water-flow problems, scale buildup, leaks, and other operating concerns.

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Do you install new tankless water heaters?

Yes. We provide tankless water heater installation and replacement, including evaluation of sizing, gas supply, venting, water piping, electrical requirements, and other installation conditions.

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Can you replace my regular tank water heater with a tankless?

Often, yes. The home should first be evaluated because converting to tankless may require changes to gas piping, venting, electrical supply, water piping, or equipment location.

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Does a tankless water heater provide unlimited hot water?

A properly sized tankless water heater can provide continuous hot water while operating within its rated capacity. However, every tankless unit has limits on how much water it can heat at one time.

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Why does my tankless water heater keep showing an error code?

Error codes can result from several conditions, including ignition, gas supply, airflow, venting, water flow, sensors, scale buildup, overheating, or electrical problems. The code helps guide diagnosis but does not always identify the exact failed component.

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Does a tankless water heater need to be flushed?

Tankless water heaters may require periodic descaling or flushing to remove mineral buildup. The appropriate maintenance frequency depends on the equipment manufacturer, water conditions, and usage.

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Can hard water damage a tankless water heater?

Mineral buildup from hard water can accumulate inside the heat exchanger and affect performance over time. Proper maintenance is especially important where water contains higher mineral levels.

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Do you work on gas tankless water heaters?

Yes. We service gas-fired tankless water heaters and can also evaluate related gas piping and venting concerns.

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How do I know what size tankless water heater I need?

Sizing depends on expected simultaneous hot-water demand, incoming water temperature, desired temperature rise, and the flow requirements of the fixtures being used.

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Should I repair or replace my tankless water heater?

That depends on the unit’s age, condition, failure, repair cost, parts availability, installation, and overall history. We diagnose the problem first and explain the options.

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Do you install customer-supplied tankless water heaters?

To ensure the system is properly sized, installed, and supported, Hardison Heat, Air & Plumbing provides the tankless water heaters we install rather than installing customer-supplied units.

Need Tankless Water Heater Service?

Whether your tankless water heater is showing an error code, not producing consistent hot water, leaking, or you’re considering converting from a traditional tank to tankless, call Hardison Heat, Air & Plumbing.

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We’ll evaluate the system, determine what is needed, and explain the repair, replacement, or installation options before work begins.

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