Tankless Water Heater Repair Austin TX

A tankless unit tells you what is wrong — it just does it in a two-digit code on a small screen. Most of what we see in Austin comes down to four things: scale in the heat exchanger, a dirty or failing flame rod, a flow sensor confused by debris, or a venting problem that trips the safety.

We carry the common parts for the major brands, so the majority of calls are diagnosed and repaired the same visit rather than becoming a parts order and a second trip.

What we repair

Error and fault codes on Rinnai, Navien, Rheem, Noritz and Takagi units
No ignition, delayed ignition, or a burner that lights and drops out
Cold water sandwiches and temperature swings at the tap
Flow rate that has quietly fallen off over a year or two (usually scale)
Flow sensors, flame rods, igniters, gaskets and thermistors
Condensate blockages, neutralizer replacement and drain issues
Venting faults and air intake blockages
Freeze damage assessment after a hard winter event

Technician testing the control board inside an open tankless water heater cabinet

How a repair call runs

1

Call or send the form

Tell us the house, the fuel, and what is going wrong. Most quotes need five minutes on the phone and a photo of your current heater.

2

On-site sizing visit

We check gas line size, venting route, electrical capacity and your peak hot water demand, then put a fixed price in writing.

3

Installation day

Most changeovers take four to eight hours. Gas line or venting upgrades can add a day. We protect floors and haul the old tank away.

4

Inspection and handover

We meet the city inspector, walk you through the controller, and set your first descaling reminder.

Symptoms worth a call

A code on the display that keeps coming back after you reset it
Hot water that turns cold a minute or two into a shower
The burner that clicks but does not light
Lower flow than the unit used to give — often the first sign of scale
Water at the base of the unit or on the garage floor beneath it
A rumbling or kettling noise when the unit fires

Repair pricing

Scope of work	Typical range
Diagnostic visit and full system test	$89 - $149
Flame rod or igniter replacement	$220 - $420
Flow sensor replacement	$240 - $450
Descale to clear a flow or temperature fault	$180 - $320
Control board replacement	$450 - $900
Heat exchanger replacement (often warranty covered)	$700 - $1,600

Estimates, not quotes. Diagnostic fee is credited against the repair if you go ahead the same visit. Planning ranges only.

The Austin pattern

Roughly half the tankless repairs we run in Austin, Round Rock and Georgetown trace back to scale rather than a broken part. The unit is not failing — it is insulated. A descale clears the code and the flow comes back, and we would rather tell you that than sell you a heat exchanger.

The other seasonal pattern is February. After a hard freeze we see split heat exchangers and cracked isolation valves on units mounted on exposed exterior walls, and pressure-damaged fittings in houses where the water was left running to prevent a freeze. Freeze damage is generally not a warranty claim, which is why placement matters so much at install time.

Frequently asked questions

My unit shows a code. Can you tell me over the phone what it is?

Often, yes. Have the brand and the code number ready when you call. Some of them — a blocked intake, a tripped condensate switch — you can clear yourself in five minutes and we will walk you through it rather than sending a truck.

Is it worth repairing a twelve-year-old tankless heater?

Usually yes if the heat exchanger is sound, because that is the expensive part and it is the part with the long warranty. If the exchanger is scaled through or leaking and out of warranty, replacement is the better spend and we will show you the numbers both ways.

Do you work on units you did not install?

Yes, that is most of our repair work. We service all major brands regardless of who installed them.

How fast can you get here?

No hot water calls get same-day or next-day slots. Everything else is usually within the week, and we give you a two-hour window rather than a day-long one.