How Much Does a Tankless Water Heater Cost in Los Angeles?
Most Los Angeles homeowners pay $2,000 to $5,500 for a gas tankless water heater, installed. Electric models run about $1,500 to $3,000. Switching from a tank to tankless often needs a bigger gas line and new venting, which can push the total to $8,000.
Get a free tankless water heater quote from a local plumber
Tell us what you need. Vetted plumbers in your area will reach out, usually the same day. No cost, no obligation.
Cost by type of tankless water heater
Electric tankless (whole home)
$1,500 to $3,000
Condos, small homes, homes without gas
Gas tankless, replacing an old tankless
$2,000 to $3,500
Like-for-like swaps with gas and venting already in place
Gas tankless, converting from a tank
$3,500 to $5,500
Most LA houses switching for the first time
Conversion with gas line upgrade
$5,500 to $8,000
Older homes with a 1/2-inch gas line
| Type | Typical installed cost in LA | Good fit for |
|---|---|---|
| Electric tankless (whole home) | $1,500 to $3,000 | Condos, small homes, homes without gas |
| Gas tankless, replacing an old tankless | $2,000 to $3,500 | Like-for-like swaps with gas and venting already in place |
| Gas tankless, converting from a tank | $3,500 to $5,500 | Most LA houses switching for the first time |
| Conversion with gas line upgrade | $5,500 to $8,000 | Older homes with a 1/2-inch gas line |
The unit itself is usually $500 to $2,000. The rest is labor, venting, gas and water connections, permits and haul-away of the old tank.
Costs people forget to budget for
- Gas line upgrade. Most gas tankless units need a 3/4-inch line. Many older LA homes have a 1/2-inch line, so expect $500 to $2,500 to upsize it.
- New venting. Tankless units vent differently than tanks. Running new stainless or PVC venting often adds $300 to $1,500.
- Electrical work. Electric models draw a lot of power and may need new circuits or a panel upgrade.
- Permit. City of LA water heater installs need an LADBS permit unless your contractor can self-permit. Ask who pulls it.
- Descaling. LA's hard water builds scale inside tankless units. Plan on a yearly flush, or about $100 to $200 if a plumber does it.
Is tankless worth it in Los Angeles?
Tankless units last about 20 years, compared with 8 to 12 for a tank, never run out of hot water and free up floor space. The trade-off is a higher upfront cost and yearly maintenance. It usually pays off if you plan to stay in your home for many years or your household regularly runs out of hot water.
If you mainly want lower energy bills, also compare a heat pump water heater, which often qualifies for larger rebates. See our water heater replacement cost guide for tank and heat pump prices.
How to get a fair price
- 1Get at least 3 written quotes for the same unit and size (measured in gallons per minute).
- 2Ask each plumber whether your gas line and venting need upgrades, and get that cost in writing.
- 3Confirm the quote includes the permit, haul-away and a scale-prevention valve kit.
- 4Check that the plumber has an active California C-36 plumbing license.
Frequently asked questions
What size tankless water heater do I need?
Most LA homes with 2 to 3 bathrooms need a gas unit rated around 7 to 9 gallons per minute. Electric units deliver less flow and suit smaller homes.
How long does installation take?
A tankless-to-tankless swap often takes half a day. Converting from a tank, especially with a gas line upgrade, usually takes a full day.
Are there rebates for tankless water heaters?
Some high-efficiency gas tankless models qualify for utility rebates, but amounts change often. Ask your plumber or check with your gas utility before you buy.
Does a tankless water heater need maintenance?
Yes. Flush it about once a year to clear scale. In hard-water areas like most of LA, skipping this shortens the unit's life.
Get a free tankless water heater quote from a local plumber
Tell us what you need. Vetted plumbers in your area will reach out, usually the same day. No cost, no obligation.
Prices reflect Los Angeles area averages as of 2026. Actual costs vary by project.