
Tankless Water Heater Repair in Sebastopol, CA
Tankless water heater repair in Sebastopol, CA for units that flash a code, run lukewarm or quit halfway through a shower. Each suspect part is tested, then fixed at a price you agree first.
- Descaling through service valves
- Rinnai, Navien, Noritz, Rheem, Takagi
- Error history read first
Fault found first
The code, the stored history and each suspect part are tested before anything is ordered.
Price agreed in writing
Parts and labor go on a written quote, and nothing starts until you approve it.
Licensed local techs
Repairs by licensed technicians who work in your part of town.
Tankless units only
One specialty: gas and electric tankless heaters that stopped doing their job.

Tankless Units in Sebastopol Homes
In Sebastopol, tankless units usually live in the garage of an older home, put in as an upgrade. Ignition faults and flow sensor problems are the common calls.
What we run into in Sebastopol
- Retrofit installs. Retrofits are common in this housing stock. When a unit throws flame codes only while the furnace or dryer runs, the gas supply is the first suspect.
- Garage installs. Here the unit typically lives in the garage, so the inlet filter and the service valves are easy to get at when it needs attention.
Sebastopol and its ZIP codes (95472) are all inside our service area.
Call (380) 273-8196Tankless Problems We Fix Around Sebastopol
Most requests for tankless water heater repair in Sebastopol, CA start with one of the symptoms below, and most end with a single part or a descale.

Unit won't light
No ignition usually means gas pressure, a worn igniter, a dirty flame rod or a blocked vent. Each is tested.

Water under the unit
Drips come from service valves, fittings, the relief valve, the condensate line or the heat exchanger itself.

Code 10 or E110
An air or exhaust code stops the burner for safety. The intake and exhaust are cleared and checked.
Shuts off mid-shower
Flow drops below what the unit needs to keep firing: a clogged filter, aerator or shower cartridge, or a sensor misreading.
Not as hot as it used to be
Scale on the heat exchanger, a weak gas supply or a thermistor reading wrong.
LC code on a Rinnai
The unit is reporting scale buildup. It needs a descale, and soon.
Can't tell which one you have? Read us the display and describe the water, and the likely fault comes back on the call.

Fix It or Retire It? Deciding in Sebastopol
Igniters, flame rods, sensors, fans, gas valves and boards are worth replacing on almost any unit. The hard call is a leaking or cracked heat exchanger on an older unit, because that part can approach the price of new.
Not sure which side of the line you are on? Call (380) 273-8196 with the brand, the age on the label and the code. You will hear whether a repair makes sense before anyone comes out.
Call (380) 273-8196Estimated Repair Costs in Sebastopol
A typical bill for tankless water heater repair in Sebastopol, CA is estimated at $150 to $800. These are estimates, not quotes, and an exchanger replacement sits higher at an estimated $1,000 to $2,500.
Diagnosis & code check
- Gas pressure measured under load
- Flow, filter and venting checked
- A plain answer on what failed
Repairs & descaling
- Flow sensor or thermistor swapped
- Unit run at full demand afterwards
- Heat exchanger descaled
Heat exchanger & major parts
- Warranty part claimed where it applies
- Combustion checked after the swap
- Honest word if a new unit is the better spend
Need Tankless Water Heater Repair in Sebastopol, CA? Call Us Now
Cold showers rarely fix themselves. Most units are back to full heat after one part and one visit.
Sebastopol Homes by the Numbers
Gas heats about 78% of homes in Sebastopol, so gas tankless units, with their vent runs and gas-line sizing, are the usual case on a call. With a median build year of 1975, many homes in Sebastopol were set up for a tank heater, which means a tankless unit often depends on a retrofitted gas line, vent run or drain. Roughly 55% of homes are owner-occupied and 68% single-family, so calls come from both homeowners and landlords.
With about 7,466 residents on roughly 1.9 square miles (near 3,971 per square mile), Sebastopol is suburban in density, with a mix of detached homes and townhomes. Among the 619 California places we cover, it ranks number 396 by population.
Source: U.S. Census Bureau, American Community Survey 2019-2023 5-year estimates for Sebastopol, CA.
Sebastopol Weather and Water Temperature
Freezing weather is essentially absent in Sebastopol: the coldest night of the past three years only reached about 35°F. Heat, sun on outdoor equipment and scale tend to matter more here than frost.
Water arriving at a Sebastopol tap in winter is likely near 54°F (averages of about 51°F in January air and 58°F over the year). To reach 120°F a tankless unit must add roughly 66°F, which a 199,000 BTU gas model at 90% efficiency can do for about 5.5 gallons per minute. In July the water is nearer 62°F, so the same unit has to add only about 58°F and can supply about 6.1 gallons per minute.
For comparison, a shower draws roughly 2 gallons per minute, so two at once plus the dishwasher can pass the winter figure. If the water goes lukewarm only when several taps run, the unit is likely maxed out; if it goes lukewarm at one tap, the cause is more often scale, a flow sensor or the flame.
Weather: NASA POWER daily temperatures, 2021-2023, for the grid cell around Sebastopol, CA, corrected to the town's elevation (USGS). Tap-water temperatures and flow rates are estimates, not measurements.
Where We Go in Sebastopol
Sebastopol and its ZIP codes (95472) are all inside our service area.
- 95472
Nearby Cities We Serve
Tankless Water Heater Repair in Sebastopol, CA: FAQs

Question not covered here?
Call and ask. Someone who repairs tankless units answers, and the phone quote is free.
Call (380) 273-8196How much does tankless water heater repair in Sebastopol, CA cost?
Most repairs cost an estimated $150 to $800, depending on the part. Descaling alone is estimated at $150 to $350, and a heat exchanger at $1,000 to $2,500. Whatever the fix, the price is agreed in writing before work begins.
Is there a reset button on a tankless water heater?
Many do it through power: switch the unit off, wait, switch it back on. That clears a code, but a code that comes back means a part needs attention.
How long does a tankless water heater last?
A gas unit that is flushed regularly commonly lasts 20 years or longer. Electric tankless models usually give 7 to 10. In Sebastopol the heat exchanger works through a rise of about 66°F on a typical winter day, which is why flushing on schedule matters there.
Why is my tankless water heater not turning on?
Check for power at the outlet and that the gas valve is open. Beyond that it is usually low flow, a clogged inlet filter, a failed flow sensor or an ignition fault. In Sebastopol, if the unit is outdoors, also check that nothing is blocking the vent cap, since insects and debris are the usual blockages in mild climates.

Schedule a Tankless Visit in Sebastopol
(380) 273-8196 reaches someone who works on tankless units every day. Describe the problem and pick a time.