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Tankless Water Heater Replacement Prescott AZ
When your tankless unit quits, you need tankless water heater replacement Prescott AZ homeowners can count on. We diagnose no-hot-water calls, error codes, and leaks, then install a new Rinnai, Navien, or Rheem unit. Serving Downtown Prescott, Williamson Valley, and Prescott Lakes, we handle gas lines, venting, and permits so you get reliable hot water the same day.
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Review the approach and price before deciding.
Prepared, clean crews
Equipped vehicles and respectful cleanup.
Local accountability
Neighbors serving neighbors with follow-through.
What is included
What's Included in Replacement
Every tankless water heater replacement Prescott AZ job includes the unit, labor, standard venting, and a full safety test. We'll tell you upfront if your gas line or venting needs an upgrade. Here's what you get.
New Tankless Unit
We supply Rinnai, Navien, Noritz, Rheem, Bosch, Takagi, A.O. Smith, or Bradford White. You pick the brand and we size it to your home's flow rate. All units come with manufacturer warranty.
Gas and Water Hookup
We connect the gas valve and water lines, then pressure-test with a gauge. If your existing shutoff is corroded, we replace it. No extra charge for standard fittings.
Vent Kit Installation
We run new PVC or stainless venting to code. That includes the vent kit, elbows, and termination. We check clearances from windows and doors before we seal it up.
Safety Testing
We use a gas leak detector and combustion analyzer to verify no leaks and proper burn. Then we run hot water at every fixture to confirm temperature and flow. You get a written test report.
Old Unit Removal
We drain and disconnect your old unit, then haul it away. No extra fee. We recycle the metal and dispose of any scale or sediment properly.
PLAN
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Service overview
Tankless Water Heater Replacement Prescott AZ
Tankless water heater replacement Prescott AZ is the removal of a failed or aging tankless unit and the installation of a new one, including gas connections, venting, and water line hookups. We start by checking your existing setup with a multimeter and thermal camera to confirm the heat exchanger, flow sensor, or igniter has actually failed. Most replacements take two to four hours. We then flush the lines, mount the new unit, and run a full combustion test before we leave.
Prescott's hard water is brutal on tankless heat exchangers. Scale buildup from our mineral-heavy supply causes short cycling, error codes, and eventually no hot water at all. If you're searching for tankless water heater replacement near me Prescott, we can usually get a tech out the same day. We also see a lot of undersized units in older Williamson Valley homes that were never sized for a family of four. Replacing with the correct BTU rating fixes that.
- Endless Hot Water Again — A new unit sized for your home delivers consistent hot water at 120-140°F. No more cold showers when the dishwasher runs. We calculate flow rate and incoming water temperature so your new tankless water heater replacement Prescott AZ keeps up with every fixture.
- Lower Gas Bills — Modern Rinnai and Navien units run at 0.95 UEF or higher. That's 10-15% less gas than a 10-year-old model. Replacing a scaled-up heat exchanger also restores proper combustion, so you stop paying for heat that goes up the vent.
- No More Error Codes — Error code 11, 12, or 16 usually means ignition failure or a bad thermistor. We replace the whole unit when repair costs exceed half the price of new. You get a clean install, a new warranty, and no more resetting the breaker every morning.
- Code-Correct Venting — Prescott requires proper PVC or stainless venting per local plumbing code. We run new vent kits and gas lines to spec, then pressure-test with a gauge. That protects your family from carbon monoxide and passes inspection the first time.
- Same-Day Service — Call before noon and we'll usually have a tech at your door the same day. We carry Rinnai and Navien units on the truck, so most replacements are done in one visit. No waiting a week for a backordered heater.
- Upfront Pricing — You get a written quote before we start. The price covers the unit, labor, vent kit, and any gas line work. We don't add charges for hauling away the old unit or for standard permits. What we quote is what you pay.
- Code-Correct Installs — Every tankless water heater installation Prescott AZ we do meets local plumbing and gas codes. We pressure-test gas lines, verify venting clearances, and pull the permit. That protects your warranty and your home.
- 5-Year Workmanship Warranty — Our labor is warrantied for five years. If a fitting leaks or the venting fails, we come back and fix it at no charge. Manufacturer warranties on the unit run 10-15 years depending on the brand. We register it for you.
The service timeline
Our Replacement Process
Diagnose
We test your existing unit with a multimeter, thermal camera, and water flow meter. You get a straight answer: repair or replace. Most calls take 30-45 minutes. If the heat exchanger is cracked or the gas valve is shot, we quote a replacement on the spot.
Quote
You get an upfront price for the new unit, labor, vent kit, and any gas line modifications. We stock Rinnai, Navien, Noritz, Rheem, and Bosch so you're not waiting on a special order. No hidden fees, no surprise charges when the job is done.
Install
We shut off gas and water, drain the old unit, and remove it. Then we mount the new tankless heater, connect gas and water lines, and run new venting. Most installs take two to four hours. We protect your floor and clean up all debris.
Test
We use a gas leak detector and pressure gauge to check every connection. Then we run hot water at multiple fixtures to confirm flow and temperature. You'll see the unit fire up and hold 120°F before we pack up.
Walkthrough
We show you how to descale the unit with a descaler pump kit, how to read error codes, and when to change the water filter. You get the manual, warranty paperwork, and our number for any questions. We don't leave until you're comfortable.
Tools and methods01 02 03 04 05 06 07 08
Tools and Methods We Use
Multimeter
Tests voltage and resistance on the control board, igniter, and thermistor to pinpoint electrical failures.
Thermal Camera
Detects hot spots and scale buildup on the heat exchanger without disassembling the unit.
Gas Leak Detector
Sniffs every gas connection after install to confirm no leaks before we leave.
Descaler Pump Kit
Flushes scale from the heat exchanger during maintenance or before a replacement to show you the buildup.
Pressure Gauge
Checks incoming water pressure and gas pressure to ensure the new unit runs within spec.
Flow Rate Sizing
We calculate peak demand in gallons per minute based on your fixtures and incoming water temperature. That tells us the exact BTU rating you need. Undersized units short cycle; oversized units waste gas.
Code-Correct Venting
We follow local plumbing and gas codes for vent material, clearance, and termination. PVC for condensing units, stainless for non-condensing. We pull the permit and pass inspection.
Combustion Analysis
After install, we run a combustion analyzer to verify proper air-fuel mixture. That confirms the unit burns clean and safe. You get a printed report.
Where this service helps
When to Replace Your Tankless Unit
Your tankless unit is 12+ years old and needs a second repair in two years.
We quote a new Rinnai or Navien with a 15-year heat exchanger warranty. We handle the swap in one day, including venting and gas hookup. You get reliable hot water, lower gas bills, and a new warranty. No more repair calls every few months.
You're remodeling a Downtown Prescott home and adding a second bathroom.
We calculate the new flow demand and install a larger unit. We also run a dedicated gas line if your existing one is undersized. Both showers run hot at the same time. The unit keeps up with the new fixtures without short cycling.
Your unit was damaged by a power surge or lightning strike.
We test the control board and gas valve. If they're fried, we replace the unit and install a surge protector on the circuit. You get a code-correct install that protects the new unit from future surges. Most jobs are done same-day.
You bought a home in Prescott Lakes with an old tankless unit and no service records.
We inspect the heat exchanger, venting, and gas line. If the unit is scaled or undersized, we quote a replacement with a new vent kit. You start fresh with a warrantied unit and a maintenance plan. No surprises down the road.
Local execution
How Replacement Works in Prescott
Prescott's water is hard, with 10-15 grains per gallon in most areas. That scale destroys tankless heat exchangers faster than in softer-water cities. We see failed units at 8-10 years here, not the 15-20 you'd get elsewhere. Our replacement process includes a water filter and a descaling schedule to protect your new unit. We also deal with altitude: Prescott sits at 5,400 feet, which affects gas combustion. We adjust the unit's dip switches for altitude so it runs correctly. For tankless water heater replacement in Williamson Valley, we often find undersized gas lines from original construction. We run a new 3/4-inch line to handle the BTU load. In Downtown Prescott, older homes may have galvanized pipes that restrict flow. We check water pressure and recommend upgrades if needed. We pull permits through Yavapai County and coordinate the inspection. Most replacements are done in a day, and we leave you with a maintenance plan.
Downtown Prescott
Older homes with galvanized plumbing and tight mechanical closets. We often need flexible vent kits and compact units.
Williamson Valley
Larger lots with well water. We test hardness and install sediment filters before the tankless unit.
Prescott Lakes
Newer construction with PEX and PVC venting. We match existing vent runs and check gas line sizing.
Hassayampa
Historic district with limited venting options. We use concentric vent kits to stay within code clearances.
Hard water at 10-15 grains per gallon
Scale builds up on the heat exchanger, causing short cycling and early failure. We install a water filter and recommend annual descaling.
High altitude at 5,400 feet
Gas-fired tankless units need altitude adjustment for proper combustion. We set the dip switches and test with a combustion analyzer.
Freeze risk in winter
Tankless units in garages or crawlspaces can freeze. We insulate lines and verify the unit's freeze protection is active.
Before and after
What a successful service visit changes.
Navien NPE-240A Swap in Downtown Prescott
Before
A 12-year-old Navien was throwing error code 11 every morning. The heat exchanger was scaled solid and the igniter was failing. The homeowner was resetting the breaker daily and still getting cold showers.
After
We installed a new Rinnai RU199i with a new vent kit and water filter. Hot water held at 120°F at every fixture. Gas usage dropped by 12% on the next bill. The job took three hours.
Maintenance: We set them up on annual descaling with a descaler pump kit. They change the water filter every six months. The unit is registered for a 15-year heat exchanger warranty.
Undersized Unit Replaced in Williamson Valley
Before
A family of five had a 150,000 BTU tankless unit that couldn't keep up. Two showers at once meant lukewarm water. The gas line was 1/2-inch, starving the unit. They'd been told the unit was fine.
After
We ran a new 3/4-inch gas line and installed a 199,000 BTU Navien. Now both showers run hot at the same time. The unit holds 120°F with the dishwasher and laundry running. Install took five hours.
Maintenance: We showed them how to flush the unit yearly and check the gas pressure. They keep the area around the unit clear for airflow. No more cold showers.
Emergency Leak Replacement in Prescott Lakes
Before
A tankless unit started leaking from the heat exchanger on a Saturday. Water was dripping into the wall. The homeowner shut off the water and called us. The unit was 10 years old and not worth repairing.
After
We installed a new Rheem RTGH-95DVLN the same day. We replaced the damaged drywall section and tested all connections with a gas leak detector. Hot water was back by 4 PM. No mold, no water damage.
Maintenance: We installed a pressure-reducing valve to keep water pressure under 80 PSI. They schedule annual maintenance. The new unit has a 12-year heat exchanger warranty.
Problems we solve
Problems We Fix with Replacement
Tankless units fail in predictable ways. Here's what Prescott homeowners call us about, and how we solve it.
No hot water at all
You're stuck with cold showers and a dishwasher that won't sanitize. If the heat exchanger is cracked, the unit is unsafe to run. We diagnose with a multimeter and thermal camera. If the heat exchanger or gas valve has failed, we replace the unit same-day. You get hot water back in hours, not days.
Error code flashing on the display
Codes like 11, 12, or 16 mean ignition failure, flame loss, or a bad thermistor. Resetting the breaker only works temporarily. We read the code, test the igniter and thermistor, and replace the failed part. If the unit is over 12 years old, we quote a full tankless water heater replacement Prescott AZ instead of throwing parts at it.
Leaking water from the unit
A leak can damage your wall, floor, and electrical connections. It often means a cracked heat exchanger or failed O-ring. We shut off the water, pull the unit, and inspect the heat exchanger. If it's cracked, we install a new unit with a replacement heat exchanger. We also check your water pressure with a gauge to prevent future leaks.
Short cycling and lukewarm water
Scale buildup restricts flow, so the unit cycles on and off. You waste gas and never get consistent hot water. We descale with a descaler pump kit and check the flow sensor. If scale is too far gone, we replace the unit. We also install a water filter to protect the new heat exchanger.
Proof behind the promise
Licensed, Certified, Reviewed
Technical expertise
Tankless Expertise You Can Trust
We've been installing and servicing tankless water heaters in Prescott since 2025. Our techs hold NATE certification and manufacturer training from Rinnai and Navien. We've completed hundreds of replacements in Yavapai County, from Downtown Prescott bungalows to Prescott Lakes new builds. We know the local water chemistry, the code requirements, and the common failure points on every major brand.
- NATE-certified technicians with factory training on Rinnai, Navien, and Noritz units.
- Licensed plumbing contractor and gas safety certification for every install in Prescott.
- We stock replacement heat exchangers, igniters, thermistors, and flow sensors for same-day repairs.
- Thermal camera and multimeter diagnostics pinpoint failures without guesswork.
- We pull permits and coordinate inspections for all tankless water heater replacement Prescott AZ jobs.
How much does tankless water heater replacement cost in Prescott AZ?
Most replacements run $1,800 to $3,500 installed, depending on unit size, venting, and gas line work. A standard 199,000 BTU Rinnai or Navien swap with existing venting sits near the lower end. If we need to run new gas lines or upgrade venting, expect the higher end. We quote upfront before any work begins.
How long does tankless water heater replacement take in Prescott?
A straight swap takes two to four hours. If we're running new gas lines or venting, plan on four to six hours. We schedule most replacements as a half-day job. You'll have hot water back the same day in nearly every case.
Should I repair or replace my tankless water heater in Prescott?
Replace if the heat exchanger is cracked, the unit is over 12 years old, or repair costs exceed half the price of new. Repair makes sense for a failed igniter, thermistor, or flow sensor, which are common in Prescott's hard water. We diagnose first and give you both numbers.
Do you offer emergency tankless water heater replacement in Prescott Arizona?
Yes. We run 24/7 emergency calls for no hot water, gas leaks, and leaking units. Call us and we'll dispatch a tech, usually within a few hours. If your unit is leaking or you smell gas, shut off the gas valve and call us immediately.
Frequently asked questions
Frequently Asked Questions
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Ask the local teamRelated services
Related Services
Tankless Water Heater Installation
New construction or first-time tankless? We size the unit, run gas and venting, and pull permits. Most Prescott homes see a 30% drop in water heating costs after switching from tank to tankless.
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Tankless Water Heater Maintenance
Annual descaling with a descaler pump kit keeps your heat exchanger clean. We flush the unit, replace the water filter, and check gas pressure. Prescott's hard water makes yearly service essential to hit the full 15-year lifespan.
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Contact the local team
Contact Our Prescott Team
Call us at +13214978646 or book online and we'll confirm your window within the hour. We answer after-hours calls for emergencies and run standard appointments Monday through Friday, 8am to 6pm. If you're in Prescott or anywhere in Yavapai County, we can usually get a tech to you the same day.