Pick a plumber who holds a current California contractor license in the plumbing classification, who puts the permit, the parts and the haul-away in a written quote, and who tells you the fuel and type of heater before they arrive. Those four things separate a clean replacement from a costly one. This page explains each, plus what happens on installation day. For the wider picture, start at our water heater section.
How do I choose a plumber for water heater replacement in Los Angeles?
Check the license, read the written quote, and ask who pulls the permit. The Contractors State License Board (CSLB) says any contractor doing $500 or more of labor and materials must hold a contractor license, and you can check a license and its classifications on cslb.ca.gov or by calling 1-800-321-2752. A plumber's work sits under the plumbing classification, C-36.
Beyond the license, look for plain signals: a quote that names the heater model, an offer to show how the old unit will be hauled away, and a clear answer on the permit. Be careful with anyone who asks for cash only, offers a price over the phone without asking the fuel type or size, or says a permit is not needed without saying why. See the permit page for water heaters for the Los Angeles rules.
What should a water heater replacement quote include?
A good quote lists the heater (brand, size, fuel and model), the labor, the permit, new connections and shutoff valves, the temperature and pressure relief valve and its discharge pipe, an expansion tank where needed, strapping, venting for gas, haul-away of the old unit, and any code upgrades. Written totals beat a verbal figure, because they can be compared line by line.
Compare quotes on the same scope, not the same total. A cheap quote that leaves out the permit, the expansion tank or the flexible connectors turns into extras on the day. For gas heaters, ask who tests for leaks at the new connections and whether the venting is checked.
The state's rules on home improvement contracts also protect you. A written contract is required over $500, and it must show the contractor's license number and tell you your right to cancel. The down payment cannot be more than $1,000 or 10 percent of the price, whichever is less. If a plumber asks for half upfront, say no and check the rules at CSLB.
What happens on water heater replacement day?
Most replacements are done in a few hours when the unit is like-for-like and the space is easy to reach. The plumber turns off the gas or power and the water, drains and removes the old heater, sets the new one, connects water, gas or electric, vents it, straps it, tests for leaks, and fires it up. Then the inspection follows.
Typical steps in order:
- Clear the work area and show the plumber the shutoffs.
- The old tank is drained, disconnected and removed.
- The new unit goes in, level, on a stand or pan if the location needs one.
- New water lines, shutoff valve, flexible connectors and relief valve are fitted.
- Gas units get a new gas connection, a sediment trap where required, and a vent check.
- The heater is strapped to wall framing. Plumbing code asks for two straps, one in the upper third and one in the lower third of the tank, with the lower strap at least 4 inches above the controls.
- The plumber lights or powers it up and checks for leaks, flue draw and temperature.
Timing varies with the location. A heater in a garage corner is easier than one in a tight hall closet or an attic, and old homes sometimes need venting or a gas line corrected. Ask for a time window rather than a promise.
Which type of replacement heater suits my Los Angeles home?
For most homes the simplest option is the same fuel and size you have now. California's 2025 Energy Code allows a gas or propane heater to replace an existing gas unit, and it allows electric storage, electric instantaneous or heat pump units where the old one was electric resistance. New homes follow a different rule, with heat pumps as the baseline.
A tank to tankless swap is a larger job. It changes the gas line size and the venting, and it needs a permit, so it costs more than a like-for-like. Our page on tank versus tankless water heaters compares them, and installation cost for a tankless unit covers the price side. A heat pump unit needs room and an air path, and it must sit on a rigid insulated surface.
The valve question comes up often too. If you only have a leaking relief valve, see water heater release valve replacement, because replacing the valve is not the same job as replacing the heater. If your heater has stopped and you need it quickly, read our page on emergency water heater repair.
When is repair better than replacement?
Repair when the tank is sound and the fault is a small part. Replace when the tank leaks, when the unit is old and failing in several places, or when scale and rust have taken over. A leak from the tank body cannot be repaired. Ask the plumber for both prices, and ask to see the reason.
Prices and the repair-or-replace maths are on our water heater replacement cost page, and the cost of small parts is on anode rod replacement cost. A gas heater with a dead pilot may only need a part, and repairing a gas water heater explains when. If water is leaking right now, shut off the water at the heater and read how to repair a water heater leak.
Safety comes first. If you smell gas, leave the building and call SoCalGas at 1-800-427-2200 from outside. Call 911 if there is danger. Do not relight a heater when you smell gas.
When you are ready for numbers, request a quote and we will arrange for a local plumber to visit. Tell us the heater's fuel, size, age and where it sits, and the visit will be better prepared. The home page shows what else we cover.
Common questions
How long does a water heater replacement take?
Often a few hours for a like-for-like swap in an easy location, plus the permit inspection. A tank to tankless conversion, a new gas line or a difficult attic or closet can stretch it to a full day or more. Ask the plumber to estimate after seeing the space, and expect hot water to return after the new tank reheats.
What should I ask before I hire someone for water heater replacement?
Ask for their CSLB license number and check it. Ask whether the price includes the permit, the expansion tank, strapping, new valves and haul-away. Ask who handles the inspection and what happens if it fails. Ask the make, model and warranty of the new heater, and get everything in writing before any money changes hands.
Does someone need to be at the property?
Yes, an adult needs to be there to let the plumber in, agree any change to the quote and sign off at the end. Hot water and, for gas units, gas service will be off for part of the day. If you rent, the landlord must approve and normally arranges the work.
Do I need a permit to replace a water heater in Los Angeles?
Generally yes. LADBS says a plumbing permit is required to replace a gas water heater in a single-family home, unless a contractor enrolled in the LADBS contractor program does a like-for-like swap. Your plumber normally pulls it. Ask how it is handled, and keep the signed-off copy for when you sell.