Tankless water heaters, drains and repiping in San Jose
No hot water, a drain that will not clear, or a leak you can hear inside the wall. We answer around the clock from our Phelan Ave service office and carry the parts most San Jose calls need on the truck.
- 24/7 answered
- Phelan Ave San Jose office
- Tank, tankless, heat pump
Perfect Tankless Plumbing, San Jose, CA
For no hot water, a drain that will not clear or failing galvanized pipe in San Jose, Perfect Tankless Plumbing installs and repairs tankless and tank water heaters, clears and replaces drains and sewer lines, and repipes older homes, with the phone answered 24 hours a day.
Water heaters first
Hot water is the call we take more than any other
Most water heaters we replace in San Jose die early for one reason: hard water. San Jose Water Company reports groundwater serving most of the valley floor at roughly 11 to 26 grains per gallon, and that mineral load settles as sediment in a tank and as scale inside a tankless heat exchanger. A tank that pops and rumbles is telling you it is half full of rock.
That is why the tankless side of the business is more than a name. We size gas tankless units against the winter inlet temperature and the number of bathrooms, upsize the gas line when a half-inch run cannot feed a 199,000 BTU unit, run new venting and a condensate drain, and pull the City of San Jose permit that every water heater replacement in California requires. We install and service the major tankless lines, including Rinnai, Navien and Noritz. When a tankless unit is already on the wall and throwing an error code, we descale it, clean the inlet filter and replace the flow sensor or igniter rather than condemn the unit.
Read about tankless installation, same-day water heater repair, or the heat pump option.
What we do
Every job a full-line San Jose plumber takes on
Six service families, one phone number. Each card opens the service most people are calling about in that family; the full list sits on the services page.
Water Heaters
Tankless installs and repair, descaling, tank replacement, heat pump conversions and recirculation pumps.
Read about tankless water heater installationEmergency & Leaks
Burst pipes, slab leaks, hidden leaks behind drywall and the after-hours calls nobody plans for.
Emergency Plumber in San JoseDrains & Sewer
Cabling, hydro jetting, camera inspection and trenchless replacement of clay laterals.
Kitchen sink and grease and related workFixtures & Bath
Toilets, faucets, shower valves and disposals, including the old threads that crumble in pre-1970 houses.
Toilet Installation and RepairRepipe, Gas & Water Quality
Whole-house PEX or copper repipes, gas lines for tankless conversions, softeners and filtration.
Whole-House RepipingCommercial
Restaurants, offices and property managers, from grease lines to racked commercial tankless units.
Commercial Plumbing in San Jose
Honest comparison
Tank or tankless: which one fits your house?
Both have a place. Here is how we talk it through on a first visit, before anyone quotes a number.
Tankless
Endless hot water- Heats on demand, so two showers and a dishwasher can run without the tank running out.
- Needs a gas line sized for the burner, new venting and a condensate drain, which is why a conversion usually takes a day or two.
- Scale from hard water builds on the heat exchanger; an annual flush keeps the warranty and the flow rate.
- Best fit: households that run out of hot water, garages short on floor space, homes planning to stay long term.
Tank
Lower upfront cost- A like-for-like 40 or 50 gallon gas swap is usually done in half a day, with the same venting and gas line.
- Sediment from hard water shortens its life here, so the anode rod and a periodic flush matter more than they do in soft-water cities.
- Recovery is limited by tank size; a big family can drain it on a winter morning.
- Best fit: budget-driven replacements, rentals, and homes where the gas line cannot be upsized cheaply.
Want the numbers behind the decision? The tankless vs tank guide walks through sourced Bay Area cost ranges, and our water heater replacement page covers the tank route in detail.
From call to cleanup
What happens after you call
- 1
You reach a person
Day or night, the call is answered by someone who can put a plumber on the schedule, not a message box.
- 2
We ask the right three questions
Where the water is, whether you can shut it off, and what the house was built with. That decides what goes on the truck.
- 3
Diagnosis before a price
We look first. On sewer calls that means a camera; on water heater calls it means checking the gas supply, venting and pressure, not just the unit.
- 4
A written scope
What we found, what we recommend, and what it will take. Cost content on this site quotes regional market ranges from published sources, never a price you are committed to.
- 5
Permits where the code requires them
Water heater replacements, sewer laterals and repipes in San Jose are permitted and inspected. We schedule the inspection as part of the job.
- 6
Test, clean up, walk through
We pressure test supply work, run every fixture we touched, and show you where the new shutoffs are before we leave.
Coverage
Where the trucks go
The service office at 332 Phelan Ave sits in the Fairgrounds district just south of downtown, which puts most of San Jose within a short drive. From there we work across the older neighborhoods with pre-1950 galvanized plumbing such as Willow Glen, Rose Garden and Naglee Park, the slab-built 1960s tracts in Berryessa, Evergreen and Cambrian Park, and the neighboring cities of Santa Clara, Campbell and Milpitas.
Our head office is in Vallejo, in Solano County, and calls from that side of the bay are handled too, though the San Jose office carries the day-to-day schedule. The service area page spells out where coverage ends and how the regions differ.
Plain facts
What you can count on from us
The phone is answered 24/7
Overnight and weekend calls reach a person. Emergency dispatch and scheduled installs go through the same number.
Tankless is the specialty
Sizing, gas upsizing, venting, condensate and descaling are daily work here, not an occasional job.
Two real offices
A San Jose service office on Phelan Ave for the field schedule and a Vallejo head office. Both are listed on the contact page.
Permitted work, inspected work
Water heaters, sewer laterals and repipes in San Jose are permitted jobs. We pull the permit and meet the inspector.
Diagnosis you can see
Sewer camera footage on the screen, pressure readings at the hose bib, a photo of the failed part before it goes in the bin.
No pressure on the quote
Repair when a repair is honest, replace when the math says so. The tank vs tankless comparison above is how we talk it through.
Water heater out this morning? Call now and we will tell you on the phone whether it is a same-day fix.
Call (669) 281-0871On the truck this year
Recent kinds of work from the San Jose office
Heat pump conversions, trenchless lateral replacements under the Sewer Lateral Compliance Ordinance, and softener installs for the valley floor water are three of the jobs that fill the schedule most weeks.
FAQ
Questions we get asked most
Yes. The number on this page is answered 24 hours a day, seven days a week, and an overnight call is put on the dispatch board the same way a daytime call is.
Usually one to two days. The extra time goes into upsizing the gas line, installing new venting and running a condensate drain, then the City of San Jose inspection is scheduled separately. A like-for-like tank swap is normally half a day.
Hard water. The groundwater serving most of the valley floor runs roughly 11 to 26 grains per gallon by San Jose Water Company data, and the calcium and magnesium settle as sediment in tanks and scale on tankless heat exchangers. Regular flushing and anode checks slow it down.
Yes. Every water heater replacement in California needs a plumbing permit and inspection. We pull it as part of the job and coordinate the inspection with you.
Most of the time. Error codes usually point to scale, a clogged inlet filter, a flow sensor, an igniter or a venting fault, and all of those are repairable. We replace units when the heat exchanger itself has failed or when parts are no longer made for that model.
Published 2026 figures put a PEX-A repipe on a 2,000 square foot San Jose home at roughly $7,500 to $14,000, with copper higher and slab foundations adding 30 to 38 percent. Those are regional planning ranges, not our quote; the house decides.
In older San Jose neighborhoods it often is. Clay laterals under 1920s and 1930s houses in Naglee Park and Northside are past their working life, and mature sycamores and oaks find every joint. A camera inspection settles it before anyone recommends jetting, lining or bursting.
There is one number for both. The San Jose service office on Phelan Ave runs the field schedule; the Vallejo head office is the company address. Calls from either side of the bay are handled the same way.
Yes. Restaurant grease lines, office and tech-campus restrooms, HOA stacks and racked commercial tankless systems are all regular work. The commercial pages describe each.
One number, any hour
Talk to a San Jose plumber now
One number reaches the schedule at any hour. Tell us where the water is and we will tell you what happens next.
