Tankless Water Heater Installation in San Jose, CA
Tired of running out of hot water? We install tankless systems that deliver endless hot water on demand — sized and vented the right way.
Tankless Water Heater in San Jose & the Bay Area
A tankless water heater heats water only when you open a hot tap — no standby tank losing heat around the clock, no running out mid-shower when the dishwasher and washing machine are both going. As Navien Service Specialists, we install and service the condensing tankless systems that most other San Jose contractors won't touch, because the venting and gas requirements trip up plumbers who only install a few a year.
The two things that make or break a tankless installation are gas line sizing and venting, and we check both before we quote a number. Most homes' existing 1/2-inch gas line is undersized for a whole-house tankless unit's higher BTU draw, so we size the line correctly rather than starving the unit of gas on cold mornings. Condensing units vent with PVC or polypropylene rather than metal flue pipe, which often means a shorter, cheaper run than the old tank ever needed — but it has to be routed and terminated to code, not just wherever is convenient.
Tankless systems last 15–20 years instead of a tank's 8–12, but only with annual descaling — San Jose's water isn't the hardest in California, but mineral buildup still reduces efficiency and shortens the heat exchanger's life if it's never flushed. We build a descaling maintenance plan into every installation, and every unit we install comes with the manufacturer's full warranty backed by our own labor guarantee.
Tankless Water Heater, Built to Last
Every tankless water heater starts with a plan: a system sized to your home, the permits and testing the job requires, and a written quote you can review before you commit. Free in-home estimates on new systems and replacements. If you would rather spread out the cost, financing is available on approved credit.
- Proper load calculation, required permits, and HERS testing on every job
- We check every rebate and incentive you qualify for at your free estimate.
- Your written quote itemizes equipment, labor, permits, and every rebate you qualify for
What's Included With Tankless Water Heater
Every tankless water heater project covers the items below, and the scope and price are confirmed in writing before any work starts. When it's finished the technician walks you through what was done and what to watch for. We call back within one business hour, 7 AM – 10 PM.
- Gas line sizing verified for the unit's full BTU draw
- Condensing venting routed and terminated to code
- Recirculation loop setup for near-instant hot water at distant fixtures
- Whole-house or point-of-use sizing based on your actual fixture count
- Annual descaling plan to protect the heat exchanger
- Full manufacturer warranty plus our own labor guarantee
Signs You Need Tankless Water Heater
These signs usually mean your current system is near the end of its useful life, and each repair tends to buy less time than the last. Holding on too long means rising energy bills, repeated service calls, and the risk of an unexpected breakdown. Call (669) 777-1997 or book online, and we will help you weigh repair against replacement.
- You run out of hot water with more than one fixture running
- You want to reclaim closet or garage space taken up by a tank
- Your current tank is nearing the end of its life and you want to upgrade, not just replace
- You're tired of standby heat loss from a tank that runs 24/7
- You want a system that can last 15–20 years with proper maintenance
Brands We Install
Promax is a Navien Service Specialist, so Navien equipment is installed by technicians with factory-backed training. We install the other brands shown here as well, and we help you compare them for your home and budget. Every brand here is widely supported, so replacement parts stay easy to find long after the installation.
Need tankless water heater help in San Jose?
Related Services
Most tankless water heater jobs touch one of these, and the same licensed Promax team handles all of them. Each page lists what's included, typical costs and the questions San Jose homeowners ask most. Not sure which you need? Call (669) 777-1997 and we'll point you to the right one.
Where We Work
Promax Service Group serves homes and businesses in San Jose, across Santa Clara County, and in nearby Peninsula and East Bay cities. Same-day service for no-cool, no-heat and no-hot-water calls, 7 days a week. Choose your city for local details, or call (669) 777-1997 to confirm we cover your address.
Frequently Asked Questions
Why choose a Navien Service Specialist for tankless installation?
Tankless systems are more particular about gas sizing, venting, and setup than a tank, and Navien's factory training goes deeper into that than a general plumbing license does. As Navien Service Specialists, we install and service the condensing tankless line that gives most other San Jose contractors trouble — meaning fewer callbacks and a unit that actually hits its rated efficiency.
Do I need a bigger gas line for a tankless water heater?
Often, yes. A whole-house tankless unit draws significantly more BTUs than a tank heater, and most homes' existing 1/2-inch gas line can't keep up. We measure your home's total gas load and upsize the line where needed as part of the installation — skipping this step is why some tankless installs underperform.
How often does a tankless water heater need descaling?
Annually for most San Jose homes, more often with harder water or heavy use. Descaling flushes mineral buildup out of the heat exchanger, which protects efficiency and is typically required to keep the manufacturer's warranty valid. We can set you up on an annual maintenance plan at installation.
Will a tankless water heater really give me endless hot water?
Yes, within its rated flow rate — a properly sized whole-house unit keeps up with a shower, dishwasher, and washing machine running at once, indefinitely, because it heats on demand instead of drawing down a tank. Sizing it to your actual fixture count and simultaneous-use pattern is the whole game, and we calculate that rather than guessing.
How much does tankless installation cost in San Jose?
Converting from a tank to tankless typically runs $4,500–$7,500 installed, depending on gas line upsizing, venting changes, and whether a recirculation loop is added. We'll give you a firm, itemized number and check any rebate you currently qualify for before you approve it.
Can a tankless water heater fail in cold weather or a power outage?
Most residential tankless units need electricity to run their electronics and ignition, so they won't operate in a power outage unless you have backup power — the same is true of many modern tank heaters' electronic ignition. Cold incoming water temperature doesn't stop the unit, it just slightly reduces peak flow rate, which we account for when sizing your system.