How much does tankless water heater installation cost in Concord?

Most tankless installations run $1,500–$3,500 depending on the unit, gas line work required, and venting configuration. Condensing units with PVC venting are typically on the higher end. We give you a clear quote before any work begins.

How long do tankless water heaters last?

Tankless water heaters typically last 15–25 years — roughly twice the lifespan of a conventional tank. Rinnai and Navien units with regular descaling in hard water areas often reach the upper end of that range.

Can I replace my tank heater with tankless?

Yes, in most cases. The main requirements are adequate gas line capacity (tankless units demand more BTUs at ignition), proper venting, and space for the new unit. We assess all of this on the initial visit — there are no surprises on install day.

Do tankless water heaters work with hard water?

Yes, but hard water accelerates mineral buildup on the heat exchanger. We recommend annual descaling with a flush kit in the Bay Area — it's a quick service call that extends the unit's life significantly. We can set you up on a maintenance schedule.

What brands do you install?

We install and service Rinnai, Navien, Noritz, and Rheem tankless units. All are proven performers for Bay Area climates. We'll help you choose based on your flow demand, budget, and whether you need an indoor or outdoor unit.

Is a permit required for tankless installation?

Yes, in most Contra Costa County jurisdictions a permit is required for water heater replacement or new installation. We handle the permit process for you — it's included in our quoted scope of work.

Do you service existing tankless units?

Absolutely. We descale, diagnose error codes, repair ignition failures, replace flow sensors and heat exchangers, and perform annual maintenance on all major tankless brands. Call us at (925) 288-0409.

Tankless water heater installation
in Concord & the Bay Area.

On-demand hot water. Lower energy bills. Lasts twice as long.

Done with running out of hot water mid-shower? Tankless systems heat water on demand — no standby energy loss, no recovery wait. We handle the full install: gas line sizing, venting, and commissioning.

Rinnai, Navien, Noritz & Rheem
We carry and install all leading tankless brands.
Full gas line & venting work
One crew handles everything — no subcontractors.
Permit included
We pull the permit and handle the inspection.
CA Lic. #802256
Licensed, insured, family-owned since 2001.

Tankless water heater unit — on-demand hot water installation by Guerra Bros. Plumbing

1 / 5

“Switched from a tank to tankless — instant hot water, lower bills. The install was clean and fast.”

Kevin M.

Walnut Creek, CA · Google

What We Install

Every tankless system,
every fuel type,
every major brand.

Whether you need a simple swap from an old tank or a full system with recirculation, gas line upgrades, and new venting — we handle it all in-house. No referrals, no subcontractors.

Need a standard tank install instead?

Condensing tankless

Non-condensing

Propane systems

Indoor units

Outdoor units

Gas line upgrades

Recirculation systems

All major brands

How It Works

From assessment
to hot water confirmed.

Step 1:
Assess Your Home
We evaluate gas line capacity, venting options, flow rate demand, and your existing setup to ensure a right-sized solution.
Step 2:
Choose Your Unit
Rinnai, Navien, Noritz, or Rheem — we match BTU output and flow rate to your household size and hot water habits.
Step 3:
Install & Connect
Proper gas line sizing, dedicated venting, and condensate drain for condensing units. Clean, code-compliant installation.
Step 4:
Test & Commission
Full flow test, temperature calibration, and a walkthrough of your unit's controls before we consider the job done.

Guerra Bros. Plumbing technician talking with a homeowner at the front door

Make the Right Call

Condensing vs. non-condensing?
Indoor vs. outdoor?
We'll help you choose.

Which tankless unit is right for you?

The best choice depends on your home layout, climate, and install location.

Condensing (95%+ efficiency)

Best efficiency

Best for indoor install with longer gas runs. Higher upfront cost, but lower operating expense. Requires condensate drain.

Non-condensing (80–85%)

Simpler install

Simpler installation and lower purchase price. Better suited for outdoor installs or shorter venting runs.

Outdoor unit

No venting needed

Eliminates venting entirely — ideal where wall penetration is difficult. Requires freeze protection in cold climates.

Signs your tankless needs service

Don't wait until you've lost hot water entirely.

Water temperature fluctuates during use
Error codes on the display panel
Reduced hot water flow or pressure
Unit won't ignite or light
Mineral buildup / hard water damage
Age 15+ years

FAQ

Common questions

What homeowners ask before switching to tankless.

: Most tankless installations run $1,500–$3,500 depending on the unit, gas line work required, and venting configuration. Condensing units with PVC venting are typically on the higher end. We give you a clear quote before any work begins.
: Tankless water heaters typically last 15–25 years — roughly twice the lifespan of a conventional tank. Rinnai and Navien units with regular descaling in hard water areas often reach the upper end of that range.
: Yes, in most cases. The main requirements are adequate gas line capacity (tankless units demand more BTUs at ignition), proper venting, and space for the new unit. We assess all of this on the initial visit — there are no surprises on install day.
: Yes, but hard water accelerates mineral buildup on the heat exchanger. We recommend annual descaling with a flush kit in the Bay Area — it's a quick service call that extends the unit's life significantly. We can set you up on a maintenance schedule.
: We install and service Rinnai, Navien, Noritz, and Rheem tankless units. All are proven performers for Bay Area climates. We'll help you choose based on your flow demand, budget, and whether you need an indoor or outdoor unit.
: Yes, in most Contra Costa County jurisdictions a permit is required for water heater replacement or new installation. We handle the permit process for you — it's included in our quoted scope of work.
: Absolutely. We descale, diagnose error codes, repair ignition failures, replace flow sensors and heat exchangers, and perform annual maintenance on all major tankless brands. Call us at (925) 288-0409.

Brands We Install

Customer Reviews

Don't take our
word for it.

All reviews on Google

Google

“Had Guerra Bros. swap out our old 40-gallon tank for a Navien condensing unit. They handled the gas line upgrade, new venting, and the whole install in one day. Instant hot water every time now — and our PG&E bill dropped noticeably.”

Yelp

“Called about a Rinnai throwing error codes. The tech arrived same morning, diagnosed a scale buildup on the heat exchanger, flushed the system, and it's been running perfectly since. Honest, straightforward — no upsell nonsense.”

Google

“Guerra Bros. installed a Noritz outdoor unit for us. The crew was clean, on time, and walked me through the controls before leaving. Three years later still works great. I refer them to everyone in Concord.”

Where We Work