Tankless Water Heater Repair in Exeter, NH
Searching for tankless water heater repair in Exeter, NH? Tell us the brand, the code and when it started. Most calls are a part or a descale, and you hear which on the phone.
- Written quote before work
- Gas and electric units
- Rinnai, Navien, Noritz, Rheem, Takagi
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 Exeter Homes
Basement units are standard in Exeter. A buried vent after a storm and a condensate pump that quits are two of the most common no-hot-water calls.
What we run into in Exeter
- Basement units. Basement installs are common, often condensing units whose acidic condensate runs to a floor drain or a small pump.
- Snow on vents. Snow drifting against a sidewall vent will stop a unit cold with a venting code until the termination is cleared.
- Freeze damage. A hard freeze can split the pipes feeding a unit. Its built-in freeze protection only works while the unit still has power and gas.
From one side of Exeter to the other (03833), plus nearby parts of Rockingham County.
Call (380) 273-8196Tankless Problems We Fix Around Exeter
Most requests for tankless water heater repair in Exeter, NH 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
Water below a tankless can be a valve, a fitting, condensate or a failed exchanger. The source decides the cost.
Venting fault
An air or exhaust code stops the burner for safety. The intake and exhaust are cleared and checked.
Frozen after a cold night
Lines feeding the unit froze, or freeze protection lost power.
Noisy or whistling
Scale, a struggling fan or a gas regulator issue, each of which shows up on testing.
Hot, then cold, then hot
A short cold burst after the tap reopens is normal start-up. Swings during one shower point to low flow, scale or a failing flow sensor.
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 Exeter
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 Exeter
Expect an estimated $150 to $800 for tankless water heater repair in Exeter, NH when a sensor, igniter, flame rod or descale is the fix. Exchanger jobs run higher, estimated at $1,000 to $2,500.
Diagnosis & code check
- Vent terminations looked over
- Flow, filter and venting checked
- Stored error history read
Repairs & descaling
- Unit run at full demand afterwards
- Isolation valves added for flushing
- Heat exchanger descaled
Heat exchanger & major parts
- Control board or gas valve replaced
- Leaking heat exchanger replaced
- Fan motor or blower replaced
Need Tankless Water Heater Repair in Exeter, NH? Call Today
A code that keeps returning after a reset is the unit asking for a proper look.
Exeter Homes by the Numbers
Heating in Exeter splits between gas (about 51% of homes) and electricity (about 22%), and tankless repairs follow the same split. Housing here is older (median year built 1968), and older homes were plumbed and vented for tank heaters, so tankless retrofits often meant new gas lines, venting or a condensate drain, which are common places for faults to start. Roughly 60% of homes are owner-occupied and 40% single-family, so calls come from both homeowners and landlords.
Exeter covers about 4.5 square miles and holds roughly 10,138 residents, around 2,253 per square mile: spread out, with mostly detached homes on larger lots and longer runs between fixtures and the street. Among the 58 New Hampshire places we cover, it ranks number 13 by population.
Source: U.S. Census Bureau, American Community Survey 2019-2023 5-year estimates for Exeter, NH.
Exeter Weather and Water Temperature
Exeter sees about 130 nights a year at or below freezing, and the coldest night of the last three winters fell to -17°F. Where that is normal, exposed water lines, condensate drains and outdoor vent terminations are the parts that fail first, and a heater with no freeze protection or a power cut is a real risk.
In Exeter the cold tap is probably around 38°F in winter and 62°F in summer, based on a January average of 26°F, a July average of 73°F and a yearly average of 50°F. Heating that water to 120°F takes a rise of about 82°F in winter, so a 199,000 BTU gas unit at 90% efficiency tops out near 4.4 gallons per minute, compared with roughly 6.1 in summer when the rise is only about 58°F.
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 Exeter, NH, corrected to the town's elevation (USGS). Tap-water temperatures and flow rates are estimates, not measurements.
Where We Go in Exeter
From one side of Exeter to the other (03833), plus nearby parts of Rockingham County.
- 03833
Nearby Cities We Serve
Tankless Water Heater Repair in Exeter, NH: 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 Exeter, NH 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. Freeze repairs depend on what split, and are priced once the damage is seen.
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 Exeter, after a hard freeze also check whether the condensate line has frozen, since many condensing models shut down when it blocks.
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.
What is the most common problem with tankless water heaters?
Scale in the heat exchanger, followed by ignition faults and flow sensor or filter problems. All three usually show up as a code or as water that won't stay hot. In Exeter, cold nights add vent-cap, condensate-line and exposed-pipe problems to the usual list.
Book Your Exeter Repair Visit
A short call to (380) 273-8196, with the model and whatever the display shows, is usually all it takes to book.
Talk to a Tankless Technician in Exeter
Covering Exeter
03833, and the neighboring parts of Rockingham County.
More New Hampshire service areas