Open 24/7 · Kyle, TX

Tankless Water Heater in Kyle, TX

A tankless water heater warms water only as it flows, so there is no tank to run empty. Call any hour about a tankless water heater in Kyle, TX, from a new install to a unit that has stopped working. Same-day service is available.

Emergency? Call now, 24/7(737) 717-0737
Cutaway of a home showing the plumbing systemWater main and sewer main under the street, a water heater in the garage, a toilet, a kitchen sink, drain lines and the sewer line. Numbered hotspots link to services.Water mainSewer mainWater heater1Drains2Leaks and pipes3Sewer line4Toilets and fixtures5
  1. Call and describeYour household, your fuel (gas or electric) and what the current heater is doing.
  2. The setup is checkedGas supply, venting, electrical capacity and water quality are reviewed.
  3. Hot water on demandThe unit is installed or repaired and run to confirm flow and temperature.
What we help with

More on water heaters

Tankless units sit within a bigger set of choices. These pages cover the rest.

Water heater replacement

Swap a failing tank for another tank or a tankless unit.

Water heater replacement details →

Water heater repair

Fix an existing tank or tankless unit.

Water heater repair details →

Water softener installation

Treat hard water before it reaches the heater.

Water softener installation details →

Gas line repair

Gas supply work for a tankless install.

Gas line repair details →
Start here

Why people look at a tankless water heater

Some come for endless hot water. Others come because a tank has failed. Red cards need action before the call.

Running out of hot water mid-showerA tank holds a fixed supply. A tankless unit heats as water passes, so it does not run dry on a long shower.Tank or tanklessAn old tank near the end of its lifeRust at the base, a leaking seam or a unit well past its years. Replacement is the moment to consider the switch.Tank or tanklessA tankless unit showing an error codeFlashing codes often point to scale, a vent issue or low flow. Look at the manual, then call.Tankless problemsHot water that turns lukewarm and backOften a flow or scale problem inside the heat exchanger.Tankless problemsA gas smell near the heaterLeave the house, avoid switches and flames, then call from outside.What to do right nowWater pooling under a unitClose the water supply to the heater and call.What to do right nowHard water scale on fixturesWhite crust on faucets signals mineral-rich supply that a tankless unit’s heat exchanger also feels.Hard water and tanklessA garage or closet short on spaceWall-mounted tankless units free floor area. They have venting and gas needs to plan for.What the install involves
Why call us

Why call about a tankless water heater

Choosing and installing a tankless unit takes a few questions answered. The call should be simple.

  • Answered at any hourA cold shower on a weekday morning is reason enough to ring. Lines are open 24/7.
  • Same-day service is availableIf a unit has stopped, hot water should not wait for the next opening.
  • Talk through the options by phoneGas or electric, whole-house or point-of-use. No form to complete.
  • Heater, gas, drains and pipes on one numberA tankless job often touches gas lines and venting, so one call keeps it together.
  • We bring up your waterYour water supplier and its hardness affect how a tankless unit ages, so that comes up early.
We vs others

Tankless questions: how the call compares

What a first call about a tankless water heater looks like next to the usual route.

UsOnion Creek PlumbingvsMany other plumbing companies
AvailabilityOpen 24/7A heater can fail on a holiday weekend.Weekday hours and a callback
Reaching someoneA person answers, no formDescribe the household and the heater.A quote form with fixed fields
How soonSame-day service is availableHot water comes back sooner.A visit days away
What jobs they handleTank and tankless, gas and electricThe unit is matched to your home.A firm that sells only one type
Local knowledgeThe City of Kyle’s very hard water supply and Texas heat in garages and atticsBoth shape how a unit should be set up.A generic install that ignores water quality
Price clarityThe page lists what moves the priceSpecifics come on the call.A package price that hides gas or venting work

Based on what is typical. Individual companies vary.

How it works

From first call to hot water

Four stages for a new tankless install. Repairs are shorter.

  1. Describe the household

    Number of people, bathrooms, appliances that use hot water and the current heater.

  2. Size the unit

    Flow rate and temperature rise decide the size. Gas supply and venting are checked.

  3. Install

    The old heater comes out. The new unit is mounted, connected to water, gas or power and vented.

  4. Test and explain

    Flow and temperature are checked, and you are shown the controls and the flush ports.

Pricing

What changes the price of a tankless water heater

Two tankless installs rarely cost the same. These are the reasons.

Gas or electric

Gas units may need a larger gas line and venting. Electric units may need a bigger breaker and heavy wiring.

Size and flow

A bigger household or more fixtures at once means a larger unit.

Venting

The vent type and route, through a wall or roof, affect labor and parts.

Replacing a tank

Moving from a tank to tankless often involves new connections, gas work and a new location.

Water treatment

Adding a softener or isolation valves for flushing is extra. Ask about pricing when you call.

Have this ready for the call

  • Gas or electric at home now
  • The size of your household and bathrooms
  • Where the current heater sits
  • Any error codes or symptoms

Ask about pricing when you call.

Call now, 24/7(737) 717-0737
How it works

How a tankless water heater in Kyle, TX heats water on demand

No tank, a heat exchanger

When you open a hot tap, flow through the unit is detected. A gas burner or electric elements switch on and heat water as it passes through a compact heat exchanger. The water leaves hot, the tap closes, the heating stops. Nothing is stored, so there is no standby loss from keeping a tank warm.

The limit is flow, not volume. A unit can heat only so many gallons per minute to a chosen temperature rise. Run a shower and a dishwasher together and a small unit may struggle. The fix is a larger unit, a second unit or point-of-use heaters for far fixtures.

Tankless units wait for the first hot water to arrive from the heater to the tap. This lag is the same as with a tank. A recirculation setup can shorten it. Another quirk is the cold water sandwich: if you shut off a tap and reopen it quickly, a slug of cold water may arrive between two hot slugs.

Parts
PartWhat it does
Flow sensorDetects water moving and starts heating
Burner or elementsAdd the heat
Heat exchangerPasses heat to the water as it flows
Control boardHolds the temperature and shows codes
Vent (gas units)Carries exhaust out of the house
Isolation valvesLet the unit be flushed clean of scale
Main parts of a tankless unit.
What is inside the box.
Tank or tankless

Tankless water heater in Kyle, TX or a new tank: how to decide

Neither type is better for everyone. The right one depends on the household, the space, the fuel and the budget. The table lays out the trade-offs, and the guide on tankless versus tank water heaters goes deeper.

QuestionTankTankless
Hot water in a long showerLimited by tank sizeStrength Keeps going
Standby heat lossA hot tank loses some heat while idleStrength No tank to keep warm
SpaceNeeds floor areaStrength Wall-mounted
Upfront costStrength Usually lowerUsually higher, plus gas or electric upgrades
Two showers and a washer at onceDraws from the stored volumeMay need a larger or second unit
MaintenanceFlush the tank, check the anodeFlush the heat exchanger on a schedule
LifespanShorter in generalOften longer when maintained
Trade-offs in general terms.

If you are replacing an existing tank, water heater replacement covers both paths. For deciding whether to repair or replace, read water heater repair vs replacement.

Hard water and tankless

Hard water, scale and your tankless water heater

Why scale matters more in a tankless unit

Hard water carries dissolved calcium and magnesium. When it is heated, some of those minerals come out as scale. In a tank, scale settles at the bottom. In a tankless unit, it forms inside the narrow passages of the heat exchanger, where it insulates the metal and restricts flow. The result is lower output, error codes and a shorter life.

The City of Kyle’s 2025 water quality report lists hardness at 275 to 295 ppm as calcium carbonate, about 16 to 17 grains per gallon, and calls anything above 180 ppm very hard. The City’s supply is a blend of several sources, so the figure shifts with the season. Not every Kyle address is served by the City, so check your bill or ask your water supplier for your own numbers.

Two habits protect a unit. First, a descaling flush through the isolation valves, using a recommended solution and a small pump. Second, treating the water before it arrives, for example with a softener. See water softener installation and the hard water in Texas homes guide.

Protecting the unit
  • Flush on a scheduleRun descaling solution through the unit as the maker advises.
  • Fit isolation valvesThey make flushing possible without cutting pipes.
  • Consider a softenerIt lowers scale before water reaches the heater.
  • Watch for error codesScale is a common trigger.
  • Check your own waterYour bill or your supplier’s annual report has the numbers.
Steps for hard-water homes.
What the install involves

What a tankless installation needs in a Texas home

Gas, power, venting and water

A gas tankless unit burns more fuel at once than a tank does. That often means a larger gas line than the tank needed, and a gas meter that can supply the flow. Venting is also different. Many units use sealed, sidewall or roof venting in a sized pipe, and the route has to be clear of combustion air and openings. See gas line repair when the supply needs work.

An electric unit draws a lot of current for short periods, so the panel and wiring must handle it. A whole-house electric model can be too much for some older services, while a small point-of-use unit near one sink is easy.

Water-side work includes new connections, a pressure relief arrangement as required and isolation valves. In a Texas house, tanks often sit in garages and attics, where summer heat is high. A wall-mounted unit has to be placed where it can vent properly and be reached for service. Where a freeze can reach an exposed pipe or an outdoor-mounted unit, protect it.

Install needs
ItemGas unitElectric unit
Fuel lineMay need a larger gas pipeNot applicable
ElectricalSmall supply for controlsLarge breaker and heavy wire
VentingRequired, sized to the modelNone
Water connectionsInlet, outlet, isolation valvesInlet, outlet, isolation valves
Best forWhole-house demandSmall homes or a single remote fixture
Needs compared in general terms.
Gas and electric needs.
Tankless problems

Common tankless problems and what they point to

  1. Error code on the display

    Codes name a category such as ignition, vent, flow or temperature. Check the manual for the code, then call.

  2. Lukewarm water

    Scale on the heat exchanger or a flow too low for the unit to light.

  3. No hot water at all

    A tripped breaker, a closed gas valve or a failed flow sensor.

  4. Water turns cold and hot

    The cold water sandwich, a low flow rate or a mixing-valve problem.

  5. Noise or rumbling

    Scale on the exchanger is a common cause. Flushing may help.

For a unit that has failed outright, water heater repair is the starting point. For the symptoms behind a failing tank, see why a water heater makes noise.

Right now

Safe steps if the heater fails or smells wrong

  1. Smell gas? Leave

    Walk out, leave the door open, avoid switches and flames and call from outside. See signs of a gas leak.

  2. Water on the floor

    Close the cold supply valve to the heater and turn the unit off.

  3. Hot pipes and scalding risk

    Set the temperature low and test water before a child bathes.

  4. Reset only as the manual says

    Repeated resets of a unit with an error code can hide a safety problem.

  5. Call any hour

    Same-day service is available.

Gas and combustion are not a DIY zone.

If you smell gas, see soot or notice a burning smell from the vent, shut the unit off if you can do so safely, leave and call.

Service areas

Where we work

Tankless water heater work is available in Kyle and the towns below. Give your address on the call, because your water supplier affects the advice.

Towns within about 25 milesSchematic map of towns within about 25 miles of Kyle10 mi20 mi25 miBuda, about 7 miles1Maxwell, about 7 miles2Manchaca, about 9 miles3Austin, about 10 miles4San Marcos, about 11 miles5Martindale, about 11 miles6Lockhart, about 12 miles7Dale, about 15 miles8Wimberley, about 17 miles9Bee Cave, about 18 miles10West Lake Hills, about 21 miles11Cedar Creek, about 21 miles12Kingsbury, about 22 miles13Dripping Springs, about 23 miles14New Braunfels, about 24 miles15Lakeway, about 25 miles16Canyon Lake, about 25 miles17The Hills, about 25 miles18Kyle
Schematic map. Rings show distance from Kyle; positions are approximate.
Questions

Tankless water heater in Kyle, TX: your questions

How does a tankless water heater work?
A sensor detects flow when you open a hot tap, and a burner or electric elements heat water as it passes through a heat exchanger. There is no stored hot water, so it does not run out in a long shower.
How much does a tankless water heater cost?
It depends on gas or electric, the unit size, the venting route, whether a tank is being replaced and any gas or electrical upgrades. Ask about pricing when you call.
Can I get a tankless water heater in Kyle, TX installed the same day?
Often, if the right unit and supplies are available. The line is open 24/7 and same-day service is available. If you have no hot water, say so on the call.
Will a tankless unit give me endless hot water?
Within its flow limit, yes. Run too many fixtures at once and the unit may not keep up. Sizing the unit to your household avoids that.
Does hard water hurt a tankless water heater?
It can. Minerals form scale in the heat exchanger, reducing output and shortening life. City of Kyle water was reported at 275 to 295 ppm in 2025, so flushing and softening are worth discussing.
How often should I flush a tankless unit?
Follow the maker’s schedule. In hard-water areas many owners flush yearly or more often. Isolation valves make this easier.
Do I need a larger gas line?
Often, yes, because a tankless unit burns more fuel at once than a tank. A plumber checks the pipe size and the meter.
Can a tankless unit run on a small electric panel?
Whole-house electric models draw heavy current and may not fit an older panel. A small point-of-use model is easier. An electrician and plumber can check.
Is a tankless water heater worth it?
For long showers, space savings and no standby loss, often yes. For a small household that rarely runs short, a tank may suit better. See tankless versus tank.
How long does a tankless water heater last?
Many last longer than tanks when maintained, but scale, water quality and use all matter. No honest page can promise a specific figure.
What should I do if my unit shows an error code?
Note the code, check the manual and try one reset. If it returns, call. See water heater repair.
Can I swap my old tank for a tankless unit?
Usually yes, with attention to gas, venting, power and space. See water heater replacement for the full picture.
Guides

Guides on water heaters

Thinking about hot water on demand?

Call any hour about a tankless water heater in Kyle, TX. Same-day service is available.

Call now, 24/7(737) 717-0737