Load & sizing calculation
Sized to your household's peak hot water demand.
Sized & installed right
Tankless Water Heater Installation in Los Angeles
Endless hot water, a smaller footprint, and lower standby energy use — when it's installed right. We size, plumb, vent, and gas-feed tankless water heaters properly, including the gas line upgrades that many conversions need.
- Live answer 24/7
- Flat-rate, no overtime fees
- Licensed contractor sent
- Satisfaction guaranteed
Dispatchers available now
Get a flat-rate price for tankless water heater installation
- Price in writing before work starts
- Same rate nights, weekends & holidays
- Ask about this month's coupons
Licensed Contractor
We send one right to your door
24/7 Emergency Service
Nights, weekends & holidays
Satisfaction Guaranteed
100% on every single job
15+ Years Experience
Trusted by local homeowners
Quick answer
Is a tankless water heater worth it?
For many households, yes: tankless units heat water on demand so you don't run out, they don't waste energy keeping a tank hot, they take up much less space, and they typically last longer than tanks. They cost more to install, especially when a gas line upgrade or new venting is needed, and they need periodic descaling in hard-water areas like Los Angeles.
Tankless Water Heater Installation
Tankless installation done right the first time
Most tankless complaints — cold-water sandwiches, error codes, lukewarm showers — trace back to the installation, not the unit. A tankless heater has to be sized to your peak demand (how many fixtures run at once and how cold the incoming water is), fed with enough gas, and vented exactly as the manufacturer specifies.
Gas supply is the big one. A whole-house gas tankless unit can need several times more gas than the tank it replaces, and many older Los Angeles homes have a gas line that's too small for that. We check the meter and line sizing on every conversion and upsize the line when needed, rather than installing a unit that starves for gas.
We also install isolation (service) valves so the heat exchanger can be descaled with a simple flush kit, and we can pair the unit with a water softener or scale-prevention filter. With LA's hard water, that one step makes a real difference in how long a tankless unit lasts. We'll also check current SoCalGas and LADWP rebate programs before you buy.
What's included
Our tankless water heater installation services.
Everything we handle under tankless water heater installation across Los Angeles, Orange County, the Valley, and the Westside.
Tank-to-tankless conversion
Old tank removed, new wall-mounted unit plumbed in.
Gas line upsizing
Gas supply checked and upgraded where needed.
Venting to manufacturer specs
Indoor or outdoor units vented correctly.
Service (isolation) valves
Installed for easy descaling and maintenance.
Recirculation options
Built-in or add-on recirculation for faster hot water.
Tankless replacement
Failed or outdated tankless units swapped out.
Rebate paperwork
Model numbers and invoices for utility rebate claims.
Get a flat-rate tankless water heater installation quote
Tell us what's going on — we'll give you a written price before any work begins.
Don't wait on these
Good reasons to go tankless
Small plumbing problems get expensive fast. If you notice any of these, call before it turns into water damage or an emergency.
Seeing one or more of these signs?
A dispatcher can usually tell you over the phone whether it's urgent — no charge to ask.
Call 877-481-4075- You regularly run out of hot water
- Your tank is near the end of its life anyway
- You need floor space in a garage, closet, or ADU
- You want to cut standby energy use
- You're remodeling or adding a bathroom
- Several showers run at the same time in the morning
- You plan to stay in the home for years
- Your current tankless unit is undersized or failing
How it works
From your call to a job done right.
No guesswork and no surprise invoices — here's exactly what happens when you book with us.
- 01
Site assessment
We check gas supply, venting route, water quality, and demand.
- 02
Flat-rate options
Unit choices with full installed prices — including any gas work.
- 03
Install
Unit mounted, plumbed, vented, and gas-fed — typically in a day.
- 04
Test & walkthrough
Flow and temperature tested; we show you how to maintain it.
Honest pricing
How much does tankless water heater installation cost?
Every job is different, so we don't guess over the phone and then change the number on site. We look at the problem, then give you a written flat-rate price before any work starts. The price you approve is the price you pay — and it's the same at 3 a.m. on a Sunday as it is on a Tuesday afternoon.
What affects the price:
- Unit size and whether it's indoor or outdoor
- Gas line upgrades needed to supply the unit
- Venting route and distance
- Whether you're converting from a tank or replacing a tankless unit
Real customers
What homeowners say after the rescue.
Our reviews come from real emergencies — and how we handled them.
Emergency Sewer Backup
“We had a sewer backup on a Sunday night — our laundry room was completely flooded. I called Rooter Rescue at 9 PM and they had a tech at the door within 45 minutes. He cleared a major root intrusion in the main line and had everything flowing again by midnight. I couldn't believe the response time. They're the only plumber I'll ever call.”
Sarah M.
Los Angeles, CA
Slab Leak Detection
“My water bill had been climbing for months and I couldn't figure out why. Rooter Rescue used electronic detection equipment to find a slab leak under my kitchen floor without ripping up a single tile — found it in under an hour. The repair was clean, fast, and came in exactly at the estimate. These guys are total pros.”
Mike T.
Los Angeles, CA
Water Heater Replacement
“My water heater died on a Friday morning. I called three plumbers — two couldn't get to me until next week. Rooter Rescue had a new unit installed that same afternoon. The tech explained every option clearly, gave me a fair price without any pressure, and left the work area cleaner than he found it. Five stars isn't enough.”
Jennifer L.
Los Angeles, CA
Specials & coupons
Save on your next plumbing repair.
Mention a coupon when you call or show it to your technician — we'll apply it to your written quote.
$50 OFF
Any Plumbing Repair
Save on any plumbing repair — leaks, fixtures, valves, drains, and more.
RESCUE50Limited-time offer
Minimum $300 job. Excludes service call / diagnostic fee.
$100 OFF
Water Heater Replacement
Tank or tankless — same-day installation available on most models.
HOTWATER100Limited-time offer
Valid on full water heater replacement with installation.
$35 OFF
Drain Cleaning
Kitchen, bath, laundry, or main line — cleared with rooter or hydro-jet.
DRAIN35Limited-time offer
One drain per visit. Not valid with camera inspection special.
FAQ
Tankless Water Heater Installation questions, answered.
Straight answers to what homeowners ask us most about tankless water heater installation.
A tankless-to-tankless replacement usually takes several hours. A tank-to-tankless conversion typically takes most of a day, and longer if the gas line needs upsizing or venting has to be rerouted.
Related services
Often booked together.
Service area
Tankless Water Heater Installation near you.
Local service locations across Los Angeles County and Orange County — pick yours for local phone numbers and directions.
- Tankless Water Heater Installation in Beverly Hills
- Tankless Water Heater Installation in Burbank
- Tankless Water Heater Installation in Encino
- Tankless Water Heater Installation in Hollywood
- Tankless Water Heater Installation in Los Angeles
- Tankless Water Heater Installation in Malibu
- Tankless Water Heater Installation in Norwalk
- Tankless Water Heater Installation in Oak Park
- Tankless Water Heater Installation in Pasadena
- Tankless Water Heater Installation in Santa Ana
- Tankless Water Heater Installation in Santa Monica
- Tankless Water Heater Installation in Tarzana
- Tankless Water Heater Installation in West Hills
- Tankless Water Heater Installation in Winnetka
- Tankless Water Heater Installation in North Hollywood
- Tankless Water Heater Installation in Toluca Lake
- Tankless Water Heater Installation in Culver City
- Tankless Water Heater Installation in West Hollywood
Available right now — 24/7
Need tankless water heater installation? Call now.
A live dispatcher answers every call, 24/7. Get a flat-rate price for tankless water heater installation with no overtime fees for nights, weekends, or holidays.
Get in touch
Request a free tankless water heater installation quote
Tell us what's going on and we'll get back to you within the hour during business hours — or call 877-481-4075 any time for immediate help.
Phone · 24/7877-481-4075Emailinfo@rooterrescueplumbing.comService AreaLos Angeles, Santa Monica, Beverly Hills, Burbank, Glendale, Pasadena, Long Beach, Torrance, Inglewood & all surrounding LA communities
HoursOpen 24 Hours / 7 Days
Active water emergency? Don't fill out a form — call immediately. Every minute of active flooding causes structural damage.