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Water Heater Repair and Replacement in San Francisco, CA
Hot Water Restored, Strapped, Vented, and Permitted
California requires residential water heaters to carry at least two seismic straps, one in the upper third of the tank and one in the lower third positioned no less than four inches above the controls. A great many tanks in older buildings around here satisfy neither condition, and nobody notices until an inspection or a sale brings it up. Malcolm Plumbing & Mechanical repairs and replaces tank and tankless water heaters throughout San Francisco, CA and across the Peninsula.
Replacement involves considerably more than swapping one cylinder for another. We pull the permit, correct the venting, fit an expansion tank where system pressure calls for one, and leave the whole installation ready for inspection rather than merely operating. Our plumbers are licensed and insured, estimates are always free, labor carries a one-year warranty, and 35+ years of local installations sits behind the work. Get in touch through our contact page and we will arrange an assessment.
Water Heaters We Repair And Replace
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Tank Water Heater Replacement
New tanks are sized to household demand and recovery needs, then installed with correct strapping, a properly pitched vent connector, a full port drain, and dielectric connections that will not corrode where copper meets the steel tank fittings.
Tankless Water Heater Installation
Continuous flow units need adequate gas supply, dedicated venting, and a service valve set for descaling. We verify the gas line can carry the load before installing, because an undersized supply produces exactly the performance complaints tankless units are blamed for.
Thermostat, Element, and Control Repair
No hot water, lukewarm water, or a burner that will not stay lit usually traces to a control, a thermocouple, an igniter, or a failed element. Testing before replacing anything keeps the repair proportionate to the fault you actually have.
Venting Correction and Flue Repair
Atmospheric vents that slope backward, share a flue improperly, or terminate badly send combustion byproducts into living space. Correcting draft problems is safety work first and comfort work second, and it gets checked on every job we touch.
Seismic Strapping and Code Correction
Missing straps, straps in the wrong position, and anchors driven into drywall rather than studs are all common findings. Correcting the installation to the current standard takes very little time and matters enormously during any significant seismic event.
Expansion Tank and Relief Valve Service
Closed systems build pressure as water heats, which strains the tank and lifts the relief valve. Adding a correctly charged expansion tank absorbs that expansion, stops the nuisance discharge, and takes real stress off the whole supply system.
See Our Water Heater Work
See how Malcolm Plumbing & Mechanical repairs and replaces water heaters with reliable, code-compliant solutions across San Francisco, CA.
FAQ's
How long does a water heater last?
Conventional tanks generally run 8 to 12 years, while tankless units often reach 20 or more with descaling. Water chemistry, sediment accumulation, anode rod condition, and whether the unit was correctly sized to begin with all move that figure meaningfully.
Is it worth repairing a water heater over 10 years old?
Usually not, once the failure involves the steel tank itself. Controls, thermocouples, and elements are worth fixing at any age, but a leaking tank at that age is telling you the corrosion has already worked its way through.
What causes a water heater to leak from the bottom?
Either a fitting, the drain valve, the relief line discharging, or the tank itself. The first three are repairable. Water from beneath the jacket means internal corrosion, which 35+ years has taught Malcolm Plumbing & Mechanical in San Francisco, CA.
Do tankless water heaters need bigger gas lines?
Frequently, yes. A tankless unit can demand several times the input of the tank it replaces, and existing piping is often undersized for that. Verifying the supply before installation avoids the performance complaints that follow an underfed unit.
Why does my relief valve keep discharging?
Excess pressure or excess temperature, and pressure is more common. Closed systems with a check valve or regulator have nowhere for thermal expansion to go. An expansion tank normally resolves it. Never plug or cap a discharging relief line.
What temperature should a water heater be set to?
Around 120 degrees suits most households, balancing scald risk against bacterial growth in the tank. Homes with dishwashers lacking internal heaters, or with immune compromised occupants, sometimes warrant a higher tank setting with mixing valves fitted at the fixtures.
Does a water heater need a drain pan?
Whenever a leak would damage the structure below, which covers most closets, attics, and upper floor installations. The pan also needs a drain routed somewhere sensible, since a pan with nowhere to discharge only delays the damage briefly.
How much space does a tankless unit save?
Roughly the footprint of the tank it replaces, since wall mounted units occupy a fraction of the volume. Malcolm Plumbing & Mechanical installs tankless systems throughout San Francisco, CA, particularly where reclaiming closet or garage space genuinely matters.
Why Choose Us for Water Heater Repair and Replacement
Permits Pulled as Standard
Unpermitted water heaters surface during sales, refinancing, and insurance claims, always at the worst moment. Handling the permit and inspection as part of the job means the installation is documented properly and never becomes somebody's negotiating point later.
Sizing Based on Real Demand
Bigger is not automatically better, and a tank oversized for a household simply loses heat to the room all day. Matching capacity and recovery to how many people actually shower each morning produces better performance and lower operating cost.
Venting Corrected, Not Reused Blindly
A new heater connected to an old vent that was already wrong is a hazard with a fresh warranty. Draft gets tested and connectors get corrected, because combustion safety is not an optional extra on a fuel burning appliance.
Old Unit Removed and Disposed
The tank leaves with us, along with the packaging and the old connectors. You are not left arranging disposal for a heavy, awkward, partly full cylinder, which is the small detail that turns an efficient morning into a frustrating afternoon.
Repair Offered Where It Is Viable
Tanks only 5 years old with a failed thermocouple need a part, not a replacement. Diagnosing honestly and repairing where repair makes sense is why buildings keep calling us instead of treating every hot water fault as a purchase.
Financing Available for Replacements
Water heaters fail without consulting your budget, which is why financing options exist for replacement work. Spreading the cost keeps a sudden failure from forcing a decision between a proper installation and whatever happens to be cheapest today.
Hot Water You Can Count On Every Morning
Water heaters are unusual among appliances in that almost nobody thinks about them until the shower runs cold, and by then the decision is being made under pressure rather than with any real consideration. A little forethought changes that entirely. Malcolm Plumbing & Mechanical assesses tanks honestly, repairs what is worth repairing, and replaces with proper permits, correct venting, and strapping that meets the current standard for buildings across San Francisco, CA. Financing is available when the timing is inconvenient, as it usually is. Reach out through our contact page and we will tell you honestly where your heater actually stands today.
Why Choose Us
24/7 Emergency Plumbing
We provide 24-hour emergency plumbing services to help customers address urgent plumbing problems quickly. Our team is ready to respond when unexpected issues arise.
Comprehensive Plumbing Services
We handle a wide range of plumbing and mechanical needs, from sewer stoppages and hydro jetting to water heaters, boilers, fixtures, and general plumbing repairs. This allows us to provide convenient solutions for many different projects.
Experienced Sewer Solutions
We specialize in sewer camera inspections, pipe location, hydro jetting, stoppage removal, and sewer replacement. Our detailed approach helps us identify plumbing problems and determine the right solution.
Reliable Service & Repairs
We take pride in providing dependable workmanship and practical solutions for residential and commercial customers throughout San Francisco and surrounding areas. From water leaks and backflow systems to boilers and sewage ejectors, we are committed to getting the job done right.
Areas We Serve
San Francisco, CA
San Jose, CA
Oakland, CA
Fremont, CA
Hayward, CA
Sunnyvale, CA
Santa Clara, CA
Vallejo, CA
Concord, CA
Berkeley, CA
Richmond, CA
Antioch, CA
San Mateo, CA
Daly City, CA
San Leandro, CA
Redwood City, CA
Mountain View, CA
San Ramon, CA
Dublin, CA
Alameda, CA