What Does a Tankless Water Heater Cost in Los Angeles County?

Tankless water heater cost is a national search with a national answer, a range too wide to be useful, because most tankless installations are priced after a plumber has seen the house. Water Heater Genius publishes a book price for the one case that can be priced before the visit: converting an existing storage tank to a Noritz tankless unit. That is $3,295 when the tank being replaced is 40 gallons and $3,695 when it is 50 gallons, installed, in every Los Angeles County city we serve. Every other brand, and every relocation, is quoted on site. This guide explains what is in that price, what is not, and what the permit and the county's hard water add. The pricing page has the list.

Water Heater Genius converts a 40-gallon storage tank to a Noritz EZTR40 for $3,295 and a 50-gallon tank to an EZTR50 for $3,695, installed, in every Los Angeles County city we serve: one number for the unit, the labor, new supply lines, a gas supply line and isolation valves. Other plumbers that publish tankless prices for the Los Angeles area list anywhere from $1,500 to $8,000, and the ones that show a breakdown price the unit ($600 to $2,600) and the labor ($600 to $2,500) separately, with gas line, venting and permit lines on top, so the total depends on how the quote is written up. Our book price sits in the lower half of what is published and is the whole number for the two EZTR models; the permit ($295 plus the city's fee) and $95 haul-away are the only lines on top.

Removing the storage tank, installing the EZTR40 or EZTR50 on the existing hookups, new hot and cold water supply lines, a new gas supply line, and isolation valves so the unit can be flushed without shutting the house down. Hauling the old tank away is $95. A drain pan is $75 and a gas sediment trap is $225 where the inspector calls for them. The permit is separate and is covered below. The job is described on our tankless water heater installation page.

A tankless unit burns gas much faster than a tank while it is running, so most models need a larger gas line, a different vent and a mounting spot the tank never needed. How far the gas run is, what size the line is and where the vent can exit are properties of the house, not the catalog, which is why a Navien, Rinnai, Takagi or Rheem installation is evaluated on site and quoted in writing before any work starts. The Noritz EZTR line was built for the swap-out case: top-mounted connections that line up with a tank's, a vent that reuses a typical tank flue path, and gas demand sized for the line a 40- or 50-gallon tank already has. The EZTR50 is our standard 50-gallon conversion. A venting upgrade from single wall to double wall is $250 to $450 where the inspector calls for it, and a circulating pump, a relocation, or a tankless unit in a home that never had a water heater is quoted on site.

Every city we serve requires a plumbing permit and an inspection for a tankless conversion. We pull it and stand the inspection for a $295 administrative fee plus the city's own fee at cost. Among the 9 cities whose current fee schedules we have read, the city's share runs from $29.57 in El Monte to $196 in Norwalk, so the permit line comes to between $324.57 and $491. Pico Rivera prices a tankless change-out separately, at $117. In La Mirada and Temple City the fee is set from Los Angeles County's own plumbing fee schedule. Our permit cost by city register has every office, phone number and verified fee. The inspector checks the gas line, the venting and the connections, and if anything is flagged we are the ones who come back to fix it.

A tankless heat exchanger has narrow passages, and the water across eastern Los Angeles County is hard: the 18 water systems whose reports we have read for the cities we serve range from 5.2 to 18 grains per gallon, and 13 of them are above the 10.5 grains that counts as very hard. At that level the manufacturers call for a descale flush every year, and skipping it is how a tankless unit ends up throwing error codes at year four. The yearly descale is $259, or it is included in the $199 per year tankless membership along with free diagnostics when a repair is needed. If a unit does fault, the tankless diagnostic is $299, includes the flush, and is waived if we repair or replace it.

A like-for-like gas tank replacement is $1,595 or $1,795, so the conversion premium is real. What it buys is unlimited hot water on a single-family gas line, a unit on the wall instead of a tank on the floor, and a longer service life if it is descaled every year. If the tank is the better fit, our water heater replacement cost guide for Los Angeles County covers that side of the decision.

The conversion price is the same everywhere we serve; the permit, the water and where the unit can go are not. Each city guide covers its own: Alhambra, Arcadia, Baldwin Park, Downey, El Monte, La Mirada, Montebello, Norwalk, Pasadena, Pico Rivera, Rosemead, San Gabriel, Temple City, West Covina, Whittier.

We dispatch from our shop in Pico Rivera and serve the San Gabriel Valley and the Gateway Cities of eastern Los Angeles County; the cities are listed on our service areas page. If yours is not on it, call and ask, and we will tell you plainly whether we can schedule it.

Book prices apply during normal business hours, Monday through Friday, 8 AM to 5 PM; pricing outside those hours or in an emergency is subject to change. Prices are current as of September 2026 and subject to change, and every quote is in writing before any work starts. A conversion is the job most people finance, and checking your options takes a few minutes. Call 833-927-3356 or send us the details.