Los Gatos Water Heater Specialists

Water Heater Out? We'll Have You Back in Hot Water Today.

Water Heater Repair in Los Gatos, CA

When your water heater quits in Los Gatos, the timing is never convenient. A cold shower before an early drive down Highway 17, no hot water for dishes after a Saturday night dinner on Santa Cruz Avenue, or a slow drip in the garage that's starting to puddle near the drywall. These are the calls we take every week.

Venture Plumbing has been repairing water heaters across Los Gatos, Monte Sereno, and the rest of the South Bay since 2009. Our shop at 228 San Jose Avenue in San Jose is a straight 15 to 20 minute run down Highway 17 or 85 to most Los Gatos addresses, which is why we can usually get a licensed plumber to your door the same day you call. We repair every major brand, Rheem, A.O. Smith, Bradford White, Rinnai, Navien, Noritz, and State, across tank, tankless, gas, electric, and heat pump configurations.

Signs Your Los Gatos Water Heater Needs Repair

Most water heater failures don't happen overnight. They announce themselves in small ways for weeks or months before the unit quits entirely. Here's what we see most often in Los Gatos homes.

Lukewarm Water Or No Hot Water At All

A gas tank unit that's producing lukewarm water almost always has a thermocouple, pilot, or gas valve issue. An electric unit in the same condition usually has a failed heating element or thermostat. Either way, it's fixable in most cases, and the parts are inexpensive compared to a full replacement. If you've got no hot water at all, it's worth a diagnostic call before you assume the unit is dead.

Rumbling Or Popping Sounds From The Tank

This is the signature sound of sediment buildup on the bottom of the tank, and in Los Gatos, the cause depends on where you live. Homes in the lower parts of 95030 and 95032 receive valley groundwater from San Jose Water Company wells, which runs very hard, often in the 210 to 503 mg/L range of calcium carbonate. That mineral load settles inside the tank, gets baked by the burner, and creates the cracking and popping you hear. Homes in upper 95030 or 95033 that receive mountain surface water from Lexington Reservoir get softer water and tend to have less buildup, but it still happens over time. A flush can often buy another couple of years, but if the noise is severe, the sediment layer may have already caused internal tank damage and replacement is the smarter call.

Rusty Or Cloudy Hot Water

Run the hot tap into a white cup and look at what comes out. If it's rust-colored only on the hot side, the tank itself is corroding from the inside, which typically means the end of the road for a tank water heater. If both hot and cold water are running discolored, the issue is likely in your supply lines, not the actual heater.

Water Pooling Around The Base

A small drip from a fitting or a valve is a repair. Water actively pooling from the bottom of the tank itself is usually a tank failure, and no repair will hold. If you see this, shut off the cold water supply valve at the top of the heater and the gas or breaker, then call us. Acting quickly here often prevents a much bigger water damage bill.

Error Codes On A Tankless Unit

Rinnai, Navien, and Noritz tankless units throw specific error codes for specific faults. Code 11 is typically ignition, code 12 is flame failure, code 14 is an overheat, etc. Hard water scale across the heat exchanger is the number one cause of declining performance and premature error codes on tankless units in Los Gatos, which is why flushing them annually with a descaling solution matters more here than it would in a soft-water region.

What Venture Actually Does On A Water Heater Repair Call

Our process is straightforward and transparent, and we explain you are on the same page as us as we go.

1. Diagnosis

Checking the gas supply, the flue and venting, the thermostat settings, the anode rod, the sediment level, the thermocouple on gas units, and the heating elements and thermostats on electric units. On tankless units, we read the control board for error codes and inspect the heat exchanger, inlet filter, and flow sensor. We don't skip steps, we perform an in-depth evaluation of your entire heater to ensure we give you the absolute best recommendations we can.

2. Options

Some repairs are clearly worth doing, such as a new thermocouple on a three-year-old unit. But, a new gas control valve on a nine-year-old tank that's already corroding is a harder call, and we'll say so. We lay out what the fix will do, how long it should buy you, and what the replacement picture looks like so you can make the call that makes the most sense for your home.

3. Start Work.

We pull old parts, install the new ones, test under load, and clean up. For tankless units specifically, we carry descaling equipment on the truck and can flush the heat exchanger at the time of repair. For gas tank units, we carry common replacement parts including thermocouples, gas valves, pilot assemblies, and dielectric nipples so we can close out most repairs in a single visit.

Repair Or Replace? How To Think About It.

This is the honest conversation every Los Gatos homeowner should have before spending any money on a repair.

When Repair Is Usually The Right Call

If your unit is under eight years old, the tank itself isn't leaking, and the failed component is a standard wear part like a thermocouple, heating element, or pressure relief valve, repair is almost always the better choice because the unit has useful life left, the parts are reasonable, and it's inexpensive compared to a full replacement.

When Replacement Starts To Make More Sense

Once a tank unit crosses the ten-year mark, the math shifts. The tank itself is nearing end of life, the anode rod is probably long gone, and any major repair is buying you another year or two, maybe. If the tank is leaking, it's not a repair situation at all. Tankless units last longer, typically 15 to 20 years with regular flushing, but a failed heat exchanger on a tankless is usually a replacement trigger because the part cost approaches a new unit.

The 2027 Gas Water Heater Rule Changes This Decision

This is the piece most Los Gatos homeowners don't know about yet. Starting January 1, 2027, the Bay Area Air Quality Management District's Rule 9-6 bans the sale and installation of most new gas-fired water heaters across the nine-county Bay Area, including all of Santa Clara County. If your gas tank water heater is already nine or ten years old today, and you're weighing a significant repair, the smarter play is often to replace it now with either a tankless unit or a heat pump water heater and get the rebate money while it's available.

Our Bay Area gas water heater ban guide walks through the full timeline and your options.

Tankless Water Heater Repair In Los Gatos

Tankless water heaters are common in Los Gatos, especially in the newer North 40 builds, the renovated mid-century homes in Belwood, and many of the hillside properties in 95033 where the homeowner installed a tankless during a remodel. Most calls we take on tankless units fall into one of three categories.

Scale Build Up Inside the Heat Exchanger

This is the biggest one, as hard water cooks onto the heat exchanger and the burner runs hotter to produce the same output, which triggers overheat codes and shortens the lifespan of the unit. The fix is a descaling flush, which we do on site in about 90 minutes. We recommend this once a year in Los Gatos regardless of whether you're seeing problems yet.

Ignition and Flame Sensor Issues

Often caused by poor venting, corroded spark plugs, or a dirty flame rod which are all repairable, usually in a single visit.

Gas Supply Problems

Tankless units demand significantly more gas flow than tank units, and some older Los Gatos homes, particularly in downtown and Almond Grove, have undersized gas lines from the meter that struggle under load. If your tankless is short-cycling or running cold partway through a shower, the issue may be upstream of the unit itself.

For reference, see our published Los Gatos water heater replacement and softener install case study for an example of how the hard water situation plays out in a real home, and how we handle both the heater and the water source that's shortening its life.

Permits And Town Of Los Gatos Requirements

Most water heater repairs don't require a permit. Replacing a thermocouple, a heating element, a T&P valve, or a thermostat is maintenance work, but water heater replacement is a different story. The Town of Los Gatos requires a plumbing permit for any water heater replacement, and for homes designated as historic, which includes anything built before 1941, exterior work such as venting changes or repositioning the unit may require additional approvals.

When we handle a replacement that requires a permit, we are happy to pull it. We also bring the installation up to current code, which typically means seismic strapping, an expansion tank on the cold supply, a proper T&P discharge line terminating within six inches of the floor, a sediment trap on the gas line for gas units, and code-compliant venting. On tankless replacements we confirm gas line sizing is adequate for the BTU load. Skipping these details is how a cheap install becomes an expensive problem at resale.