Plumbing advice for San Jose homes
Written from the calls we take most: water heaters, hard water, old pipes and sewer laterals. Cost figures come from published sources and are labelled as planning ranges.
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Perfect Tankless Plumbing, San Jose, CA
These guides answer the plumbing questions San Jose homeowners ask us most, from choosing between tankless and tank water heaters to passing the sewer lateral inspection when selling, each written by Cedric Greenlee and updated in September 2026.
San Jose has a particular mix of plumbing problems: some of the hardest water in the Bay Area, a large stock of 1950s to 1970s houses with aging galvanized or copper pipe, slab-built tracts and Eichlers, and a city rule that tests every sewer lateral when a house sells. The guides are organised around those realities.
Each one ends with the questions readers ask about it and links to the service pages that cover the actual work. Nothing here is a quote; when a guide mentions a price, it names the published source and treats it as a planning range.
Topic
Water heaters
Tankless vs Tank Water Heaters in San Jose: Which Fits?
Cost, install time, upkeep and the houses each one suits, with published Bay Area ranges.
Read the guide on tankless vs tank
Updated Sept 2026
What a Tankless Water Heater Install Costs in San Jose
Published ranges, the line items behind them and how to read a quote.
Our tankless install cost guide
Updated Sept 2026
Why a Tankless Water Heater Goes Cold Mid-Shower
Scale, low flow, gas supply and sizing: how to tell which is making your shower go cold.
Updated Sept 2026How Often to Flush a Tankless Water Heater in San Jose
Descaling intervals for local water, what the flush involves and the signs it is overdue.
Read the guide on how often to flush tankless
Updated Sept 2026Heat Pump Water Heaters in Santa Clara County: A Guide
How they work, what the house needs and how they compare with gas options.
Updated Sept 2026Rinnai Error Codes Explained: 10, 11, 12, 16, 79 and LC
What the common Rinnai codes mean, what you can check yourself and when to call.
Updated Sept 2026Navien Error Codes Explained: E003, E012, E016, E030, E515
What the common Navien E codes mean, what you can check and when to call.
Updated Sept 2026
Topic
Water quality
Hard Water and Your Water Heater in San Jose, CA
What the local hardness numbers mean for tanks and tankless units, and what helps.
Hard Water and Your Water Heater in San Jose, CA
Updated Sept 2026Water Softener or Conditioner for San Jose Water?
How each works on local water, and where a chloramine filter fits in.
Read the guide on softener or conditioner
Updated Sept 2026
Topic
Pipes and leaks
Signs Your Galvanized Pipes Are Failing in San Jose
Rusty water, falling pressure and repeat leaks: how to tell when a repipe is due.
Updated Sept 2026Pipe Burst in San Jose? What to Do in the First 10 Minutes
The first ten minutes, in order: shutoffs, power, drainage and what to photograph.
Read the guide on when a pipe bursts
Updated Sept 2026
Topic
Sewer and drains
Sewer Lateral Inspection Before Selling in San Jose
What the point-of-sale test involves, what fails it and when to book it.
Our lateral inspection before selling guide
Updated Sept 2026Trenchless vs Open-Cut Sewer Replacement in San Jose
Bursting, lining and open trench compared, with published San Jose ranges.
Updated Sept 2026
Topic
Hiring and planning
How to Choose a Plumber in San Jose: 7 Questions to Ask
Seven practical questions that separate a complete quote from a vague one.
Updated Sept 2026SB 407 Fixture Rules for San Jose Home Sellers
What California requires of pre-1994 fixtures, and how sellers get ready.
Our sb 407 fixture rules guide
Updated Sept 2026Plumbing an ADU in San Jose: Sewer, Water and Gas
Sewer, water and gas for a backyard unit or garage conversion, planned early.
Updated Sept 2026
FAQ
Questions we get asked most
Cedric Greenlee, our plumbing guides editor, writes and edits them from the questions customers ask on real jobs.
No. They are published regional ranges, named with their source. Your price depends on your house and is agreed before work starts.
They were last updated in September 2026, and figures are revised when the published sources change.
Yes. Call any hour and a person will answer it.
No. They explain what to look for; a plumber on site confirms what is actually happening in your house.
One number, any hour
Have a question the guides do not answer?
Call any hour and ask. If it needs a visit, we will book it on the same call.
