Unit Sizing and Selection
We calculate the flow rate and temperature rise your home needs, then match it to a Rheem, Rinnai, or Navien unit. You get the model, the BTU rating, and the price in writing before we order anything.
Licensed
Licensed & Bonded
Fully Insured
Insured & Bonded
24/7 Emergency
Same-Day Response
Warranty Backed
10+ Years Trusted in Covina
What Our Tankless Water Heater Service Includes
Every install and repair starts with a full assessment and ends with a tested, permitted system. Here is what is covered on a standard job, and what we quote separately if your home needs it.
Gas Line and Venting
New gas line sized to the unit's BTU rating, run with copper pipe or approved flex, plus stainless or PVC venting to Uniform Plumbing Code (UPC) standards. We pressure-test the line and confirm the meter can supply the load.
Permit and Inspection
We pull the Covina building permit and meet the inspector on site. You get the signed-off permit for your records, which protects your warranty and matters when you sell the house.
Water Line Connections
New shutoff valves, flex connectors, and a full flush of the hot and cold lines. We install a sediment filter on the cold inlet to catch the grit that would otherwise clog the heat exchanger.
Startup and Walkthrough
We fire the unit, set the outlet temperature to 120 degrees, and test hot water at every fixture. You get a walkthrough on the controller, the filter cleaning schedule, and the annual descaling interval.
Old Unit Haul-Away
We drain and remove the old tank, disconnect the gas and water, and haul it away. No tank sitting in your driveway waiting for bulk pickup day.
Tankless Water Heater Covina CA: What the Work Actually Involves
A tankless water heater Covina CA installation is not a swap-and-go job. We run a dedicated gas line sized to the unit's BTU rating, upgrade the venting to stainless steel or PVC per Uniform Plumbing Code (UPC) requirements, and mount the heater on an exterior wall or in a garage bay with proper clearances. Inside, we flush the existing copper pipe or PEX tubing, install new shutoff valves, and pressure-test the whole run before the unit ever fires. Most single-family retrofits take four to six hours; a condor or tight closet can run longer.
Covina sits in the San Gabriel Valley where water hardness regularly tops 10 grains per gallon, and that calcium is what kills tankless units early. Scale builds on the heat exchanger, restricts flow, and forces the burner to work harder. That is why we recommend an annual descaling service and, for many homes, a water softener on the cold inlet. If you have been searching for a tankless water heater near me Covina CA and want a straight answer on whether your panel and gas meter can handle the load, we will tell you before you spend a dime.
Our Tankless Water Heater Installation Process
From the first call to the final test, here is exactly what happens when we install or replace a tankless unit in Covina.
01
Schedule
Call or book online — a real human picks up and confirms a 2-hour arrival window.
02
Diagnose
Licensed tech inspects on-site, then walks you through the cause and your options.
03
Fix
The job is completed to code and done right the first time — no shortcuts, no surprises.
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Guarantee
Every job backed by a written workmanship warranty — and we stand behind it.
Tools and Methods We Use on Tankless Jobs
Tools & Equipment
Press tool
Connects copper and PEX fittings in seconds without an open flame, which is safer in tight closets and attics.
Soldering torch
Used for copper pipe joints where a press connection is not practical, with a heat shield to protect framing.
PEX crimping tool
Secures PEX tubing connections to Uponor and SharkBite fittings for a leak-free water line.
Pipe camera inspection
Confirms the gas and water lines are clear of debris and scale before the unit is fired.
Leak detection equipment
Finds hidden leaks in the wall or slab that would otherwise drop pressure and short-cycle the heater.
Commercial descaling pump
Circulates descaler through the heat exchanger to dissolve calcium and restore full flow.
Manometer
Measures gas pressure at the unit to confirm the supply meets the manufacturer's spec.
Methods & Standards
Uniform Plumbing Code (UPC) compliance
Every gas line, vent, and water connection is installed to UPC standards and inspected by the Covina building department. That protects your warranty and your home's resale value.
Manufacturer startup procedure
We follow the Rheem, Rinnai, or Navien startup checklist, including setting the outlet temperature to 120 degrees and verifying flow at every fixture.
Annual descaling schedule
We set you up on a 12-month descaling interval based on your water hardness. Covina water averages 10 to 14 grains per gallon, so this is the single biggest factor in unit lifespan.
Gas pressure and flow testing
We test static and dynamic gas pressure at the unit and confirm the meter can supply the load. If it cannot, we coordinate the meter upgrade with SoCalGas before install day.
When Covina Homeowners Call Us for Tankless
01
A 1,400 square foot home in Charter Oak with a 12-year-old tank that is rusting and leaking at the base.
What we do: We drain and remove the old tank, install a 199,000 BTU Rinnai unit on the exterior wall, run a new gas line, and pull the permit. The whole job is done in one day.
→ The homeowner gets endless hot water, reclaims 9 square feet of garage space, and cuts water heating gas use by about 25 percent.
02
A Downtown Covina condo with an electric tank in a closet and no room for a traditional replacement.
What we do: We install a wall-hung electric tankless unit that fits the closet, upgrade the circuit to handle the load, and add a sediment filter on the cold inlet.
→ The condo gets on-demand hot water without losing closet storage, and the unit fits the existing space with no structural changes.
03
A West Covina rental property where the tankless unit is throwing an error code and the tenant has no hot water.
What we do: We dispatch a tech the same day, diagnose a failed flow sensor, replace it from stock, and descale the heat exchanger while we are there.
→ The tenant has hot water the same afternoon, and the landlord avoids a replacement cost of $3,000 or more.
04
A Glendora home with hard water that has already killed one tankless unit in six years.
What we do: We install a new Navien unit with a water softener on the cold inlet and set up an annual descaling schedule.
→ The new unit runs at full flow, and the softener keeps scale off the heat exchanger so it lasts the full 18 to 20 years.
How Tankless Water Heater Work Runs in Covina
Covina's housing stock ranges from 1920s bungalows near Downtown to 1980s tract homes in Charter Oak, and each era brings its own tankless challenges. Older homes often have a 1/2-inch gas line that cannot supply a 199,000 BTU unit, so we run a new 3/4-inch line from the meter. Mid-century homes may still have galvanized pipe that restricts flow, which means a repipe with copper pipe or PEX tubing is the right first step. The water here runs 10 to 14 grains per gallon, so we install a sediment filter on every unit and recommend a softener for homes above 10 grains. Covina also sits in a seismic zone, so we anchor the unit and use flexible gas connectors to code. If you are comparing tankless vs tank water heater Covina California options, we will walk you through the real numbers for your specific home, not a generic sales pitch.
Neighborhoods We Serve
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Downtown Covina
Many homes here are 1920s to 1940s builds with original galvanized pipe. We often repipe the hot side before installing a tankless unit so the heater gets proper flow.
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Charter Oak
Mostly 1960s to 1980s tract homes with 1/2-inch gas lines. A new 3/4-inch line from the meter is common on tankless installs here.
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West Covina border
Larger homes with two or three bathrooms often need a 199,000 BTU unit or a condensing model to handle simultaneous demand.
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Glendora and San Dimas
Homes at higher elevation see cooler inlet water in winter, which lowers flow rate. We size the unit for the coldest incoming water temperature.
Local Conditions We Plan For
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Hard water at 10 to 14 grains per gallon
Scale builds on the heat exchanger and restricts flow. Annual descaling and a softener are the fix, and they extend unit life from 10 years to 18 or 20.
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Older 1/2-inch gas lines
An undersized line starves the unit and causes error codes. We run a new 3/4-inch line from the meter, which adds $600 to $1,200 to the job.
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Seismic activity in the San Gabriel Valley
Units must be anchored and connected with flexible gas connectors to code. We install seismic straps and flex lines on every job.
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Cooler winter inlet water
Inlet water can drop to 55 degrees in January, which lowers the unit's flow rate. We size for winter conditions so you still get full flow in summer.
Leaking 50-Gallon Tank to Wall-Hung Rinnai
Tankless Water Heater Problems We Fix in Covina
Most tankless issues trace back to hard water, gas supply, or a part that has simply worn out. Here are the calls we run most often in Covina and how we handle them.
Problem
No hot water or cold showers
A tankless unit that stops heating usually means a failed igniter, a clogged inlet filter, or a gas valve issue. Left alone, the unit keeps cycling and can damage the heat exchanger.
Our Fix
We diagnose the error code, test the igniter and gas valve, and clean or replace the inlet filter. Most same-day tankless water heater repair near Covina CA calls are resolved in one visit because we stock the common parts.
Problem
Error code on the controller
Codes like 11, 12, or 16 point to specific faults, but guessing wastes time and money. Ignoring a code can lead to a cracked heat exchanger and a full replacement.
Our Fix
We read the code, test the corresponding sensor or component, and repair or replace only what failed. You get a written explanation of what the code meant and what we did to fix it.
Problem
Water leaking from the unit
Leaks usually come from a failed O-ring, a cracked heat exchanger, or a loose fitting. A slow drip can damage drywall and flooring before you notice it.
Our Fix
We isolate the leak with a pipe camera inspection if needed, replace the failed part, and pressure-test the unit. If the heat exchanger is cracked, we give you a straight replacement quote versus repair.
Problem
Low water pressure at fixtures
Scale buildup in the heat exchanger and inlet filter restricts flow, which makes the unit short-cycle and can leave you with lukewarm water.
Our Fix
We descale the heat exchanger with a commercial pump and descaler, clean the inlet filter, and test flow at every fixture. If hardness is above 10 grains, we recommend a water softener to stop it from coming back.
Problem
Unit short-cycling on and off
Short-cycling wears out the igniter and gas valve faster and drives up your gas bill. It is often caused by a flow sensor or a gas supply issue.
Our Fix
We test the flow sensor, check gas pressure at the unit, and confirm the gas line is sized correctly. If the line is undersized, we run a new one from the meter.
Why Covina Homeowners Switch to Tankless
Tankless units cost more up front than a tank, and they pay it back in space, lifespan, and gas savings. Here is what changes once the install is done.
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Endless Hot Water
A 199,000 BTU gas tankless heater produces roughly 9 to 11 gallons per minute, enough to run two showers and a dishwasher at once. No recovery time, no waiting 30 minutes between loads. For a family of five in Charter Oak, that alone ends the morning shower schedule.
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Cuts Gas Bills 20-30%
Because there is no standby tank losing heat 24/7, most Covina homes see gas use drop 20 to 30 percent on water heating. At current SoCalGas rates that is often $15 to $30 a month, which pays back the higher install cost in five to seven years.
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Frees Up Garage Space
A wall-hung unit is about the size of a carry-on suitcase. Removing a 50-gallon tank and its drip pan reclaims roughly 9 square feet of floor space, which matters in Covina's older 1,200 to 1,500 square foot homes where the garage doubles as storage.
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Lasts 20 Years, Not 10
Tank units in hard water fail at 8 to 12 years. A properly maintained tankless heat exchanger runs 18 to 20 years, and the unit carries a 15-year warranty on the exchanger from Rheem, Rinnai, and Navien. Descaling once a year is the difference.
Licensed, Insured, and Local to Covina
Licensed & Certified
- California Contractor License (C-36 Plumbing) — issued by California Contractors State License Board
- EPA Lead-Safe Certified — issued by U.S. Environmental Protection Agency
- Backflow Prevention Certification — issued by Los Angeles County Department of Public Health
- OSHA Safety Compliance — issued by Occupational Safety and Health Administration
- IAPMO Certification — issued by International Association of Plumbing and Mechanical Officials
Verified Reviews
Google ★★★★★4.9
Installed a Rinnai tankless unit in our Covina home in one day. They pulled the permit, ran a new gas line, and cleaned up everything. Our gas bill dropped about $25 a month. Straight answers, fair price, no pressure.
Yelp ★★★★★4.8
Our Navien stopped heating on a Friday. A1 had a tech out the same afternoon, replaced the flow sensor, and descaled the unit. $340 total. They could have sold us a new heater and did not.
BBB ★★★★★4.9
We used A1 for a tankless install and a water softener at our Glendora rental. They coordinated with the tenant, handled the inspection, and finished in a day. Two years later, no issues.
Google ★★★★★5.0
Called about a leaking tank on a Saturday. They came out, gave us a flat-rate quote for a tankless replacement, and installed it Monday. The old tank was hauled away and the garage floor was dry when they left.
10 Years Installing Tankless Systems in the San Gabriel Valley
A1 Plumbing Covina CA has been installing and servicing water heaters since 2016, which means a decade of Covina-specific experience with hard water, older galvanized and copper pipe, and the gas capacity limits of mid-century homes. Our techs hold California Contractor License (C-36 Plumbing) credentials and are EPA Lead-Safe Certified, which matters in pre-1978 houses where disturbing old pipe can release lead. We service Rheem, Rinnai, Navien, Bradford White, and AO Smith units, and we carry the parts to repair most brands on the first visit.
- California Contractor License (C-36 Plumbing) held by the owner and lead techs on every job.
- EPA Lead-Safe Certified for work in Covina's pre-1978 housing stock.
- Trained on Rheem, Rinnai, Navien, Bradford White, and AO Smith tankless platforms.
- Backflow Prevention Certification for combination boiler and domestic hot water systems.
- OSHA safety compliance on every gas line and venting install.
What Covina Customers Say About Our Tankless Work
Real experiences from customers who chose our Tankless Water Heater services.
“Our old tank was leaking in the garage and we had been putting off the switch for two years. A1 came out, quoted a Rinnai unit with a new gas line, and had it installed in one day. The permit and inspection were handled. Six months in, our SoCalGas bill is down about $22 a month and we have not run out of hot water once.”
M
Maria G.
Homeowner, Downtown Covina
“Our Navien started throwing an error code and running cold. I called at 9 a.m. and a tech was here by 1 p.m. the same day. It was a clogged inlet filter from hard water. He cleaned it, descaled the exchanger, and showed me how to flush the filter myself every few months. Fair price, no upsell.”
D
Dave R.
Homeowner, Charter Oak
“We manage six rental units and needed tankless installs done right so we would not get callbacks. A1 handled the permits, the gas line upgrades, and the venting on all six. They coordinated with tenants and finished each unit in a day. Two years later, zero service calls on the heaters.”
S
Sandra L.
Property Manager, West Covina
Tankless Water Heater Questions Covina Homeowners Ask
Real answers to the questions we hear most often from local homeowners and property managers.
How much does a tankless water heater cost in Covina CA?
A standard gas tankless install in Covina runs $2,800 to $4,500 in 2026, including the unit, permit, venting, and labor. Electric units are $1,800 to $3,200 but often need a panel upgrade. If you need a new gas line from the meter, add $600 to $1,200. We give you a flat-rate written price before any work starts.
Is a tankless water heater worth it in Covina, California?
Yes, if you plan to stay in the home five years or more. Covina gas rates and hard water make the math work: a tankless unit cuts water heating gas use 20 to 30 percent and lasts 18 to 20 years versus 8 to 12 for a tank. The break-even is usually five to seven years, and you get endless hot water the whole time.
How long do tankless water heaters last in Covina?
Expect 18 to 20 years with annual descaling, or 10 to 12 years without it. Covina water averages 10 to 14 grains per gallon, so scale is the main killer. We recommend a descaling service every 12 months and a water softener on the cold inlet if your hardness tests above 10 grains.
Why is my tankless water heater not heating in Covina CA?
The three most common causes we see are a clogged inlet filter from hard water, a failed igniter, or a gas supply issue from a undersized line. Error codes on the controller usually point to which one. Call 626 687 0334 and we can often diagnose it over the phone before we roll a truck.
Other Services Covina Homeowners Pair With Tankless
Emergency Plumber
A tankless unit that leaks or throws a gas error at 2 a.m. is an emergency. We run 24/7 calls across Covina and can shut down the gas and water, then repair or replace the unit the same night.
View Emergency PlumberDrain Cleaning
Hard water scale does not just hit the heater, it narrows drain lines too. If your fixtures are draining slow while we are on site for a tankless install, we can snake or hydro jet the line the same visit.
View Drain CleaningSewer Line Repair
Older Covina homes often have cast iron pipe that is already at the end of its life. If a sewer line backup shows up during a water heater project, we can camera the line and give you a repair plan before it becomes an emergency.
View Sewer Line RepairTrenchless Sewer Repair
If the sewer line under your yard is failing, trenchless repair replaces it without tearing up the lawn. We often bundle this with a tankless install when both systems are due, saving you a second mobilization.
View Trenchless Sewer RepairHydro Jetting
Hydro jetting scours grease and scale from drain walls with 4,000 PSI of water. It is the right call when a snake just pokes a hole through buildup. We recommend it before a tankless install if your drains are slow.
View Hydro JettingSlab Leak Repair
A slab leak under a Covina home can drop water pressure and make a new tankless unit short-cycle. We use leak detection equipment to pinpoint the break, then repair or reroute the line with minimal concrete cutting.
View Slab Leak RepairCall A1 Plumbing Covina
Reach us at 626 687 0334 any hour of the day. Our office answers from 7 a.m. to 7 p.m. on weekdays, and emergency dispatch runs 24/7 for leaks, backups, and gas calls. Tell us what is happening and we will give you a straight answer and a flat price before anyone heads your way.
A1 Plumbing Covina CA
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Phone
626 687 0334 -
Address
4715 N Vecino Dr, Covina, CA 91722
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Hours
Mon–Fri: 7AM – 7PM
Sat: 8AM – 4PM
Sun: Emergency Only
24/7 Emergency Available