Tankless Water Heater Replacement in Simi Valley, CA
Get endless hot water back in your Simi Valley, CA home with a tankless water heater replacement done the right way, from gas line sizing to venting and descaling valves.
- Code Compliant
- Dependable Hot Water
- Isolation Valves Installed Standard
- Quick Tankless Installation
Get Your New Tankless Water Heater Installed in Simi Valley, CA.
Tell us your current unit model and we will quote a matching replacement over the phone.
Your Go-To for Tankless Water Heater Replacement in Simi Valley, CA
FKM Plumbing handles every part of a tankless swap, including removing the old unit, upgrading the gas line if needed, installing new concentric or PVC venting and adding service valves for annual flushing. You get a neat, code-compliant install and a walkthrough of how to keep the heat exchanger healthy.
Our expertise includes:
- Gas line sizing and upsizing for 199,000 BTU tankless units
- Accurate sizing and model selection for your home.
- Precise sizing and installation of new tankless units.

Additional Plumbing Replacement Services in Simi Valley, CA
When repairs are no longer enough, our replacement services in Simi Valley, CA deliver durable upgrades that restore full performance.

Customers
Why Choose FKM Plumbing for Tankless Water Heater Replacement in Simi Valley, CA?
We understand the plumbing challenges homes face in Southern California and are ready to handle any complexities involved in swapping your old tankless unit for a new, reliable one.
- Longer Lifespan, Tankless water heaters typically last longer than conventional tank units, often up to 20 years with proper maintenance, offering better long-term value.
- Right-Sized Units, We calculate gallons per minute and temperature rise for your fixtures instead of estimating from square footage.
- Endless Hot Water, Never run out of hot water, even during peak demand, a true luxury for busy Simi Valley households with multiple showers or large families.
Citywide Coverage
FKM Plumbing proudly serves every neighborhood and community within Simi Valley for all your tankless water heater replacement needs. Whether you are downtown or in the surrounding suburbs, our team is ready to deliver prompt and professional service.
Experienced Team
Our technicians have pulled and replaced tankless units from Rinnai, Navien, Noritz, Takagi and Rheem, so they know the quirks of each brand's error codes and mounting brackets. They also understand which older units can be matched to existing venting and which need new runs.
Safety-First Approach
Safety and code compliance come first in every tankless water heater replacement we perform. Our installations follow all Southern California and local Simi Valley plumbing and gas codes, so your system operates safely and efficiently.
Trusted Certified Simi Valley Plumbing Services Professionals
At FKM Plumbing, we take pride in providing certified plumbing services throughout Simi Valley, CA. Backed by leading industry credentials, our experienced plumbers combine technical skill with genuine customer care. Whether it is repair, installation, or maintenance, we follow strict safety and quality standards to deliver lasting results you can trust.
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PHCC Plumbing Contractor Recognition
Better Business Bureau (BBB) Accreditation
Angi Certified Pro
ISO 9001 Quality Management CertificationDependable Tankless Water Heater Replacement Services in Simi Valley, CA
Commercial Tankless Water Heater Replacement in Simi Valley, CA
Businesses in Simi Valley, CA often require robust hot water solutions, and tankless systems can provide the efficiency and capacity needed. We regularly replace commercial tankless units for restaurants, offices and other facilities with minimal disruption to your operations. Our plumbers are skilled with high-capacity models and complex plumbing layouts. We deliver a steady hot water supply that meets your business's demands and health code requirements.

Recirculation Tankless Upgrades in Simi Valley, CA
If you are tired of running the tap waiting for hot water, a tankless with a built-in recirculation pump can bring heat to the fixture in seconds. Navien A series and Rinnai units with internal pumps can use a dedicated return line or a crossover valve under the farthest sink. We program schedules so the pump runs only during your morning and evening peaks. That keeps gas use in check while saving thousands of gallons of wasted water a year. This upgrade is popular in long single-story ranch homes.
Residential Tankless Water Heater Replacement in Simi Valley
For homeowners in Simi Valley, upgrading to a tankless water heater offers real benefits like endless hot water and reduced energy use. We assess your household's hot water demand to recommend the ideal sized unit, so you get optimal performance. Our team handles everything from safely disconnecting your old unit to installing the new tankless system. That includes all necessary gas and water line adjustments and venting changes to meet current codes.
Tankless vs. Tank Water Heater Conversion in Simi Valley, CA
Considering converting from a traditional tank water heater to a tankless system in your Simi Valley, CA home? This is a common and beneficial upgrade, but it requires specialized expertise. We handle the entire conversion, which can involve rerouting gas lines, upgrading electrical service, modifying water lines and installing new venting. Our team ensures a smooth transition, so you can enjoy the long-term benefits of a modern, efficient tankless system.
Condensing Tankless Replacement in Simi Valley
Condensing tankless units like the Navien NPE series or Rinnai Sensei reach efficiencies above 90 percent by capturing heat from exhaust gases. They vent through inexpensive PVC and produce acidic condensate that must be neutralized and drained properly. We install a neutralizer cartridge and route the condensate line to an approved drain. A warm, dry climate is the main factor for plumbing in Southern California, with long irrigation seasons and year-round demand on outdoor lines. Condensing units still save gas because they work year-round on showers, laundry and dishes. We explain the cost difference so you can decide if the efficiency gain is worth the price.
Exterior Mount Tankless Units in Simi Valley, CA
Many homes have tankless heaters mounted on an exterior wall with no venting at all, since the unit exhausts directly outside. These units face sun, rain and temperature swings, which can break down plastic covers and wiring over time. On an occasional cold night, covering backflow preventers and outdoor valves is typically enough to avoid a break. When we replace them, we check the pipe cover, freeze protection settings and the electrical connection. We can add a protective pipe cover kit to shield the water and gas lines. Exterior models are often the easiest swap when the gas line is already sized correctly.
Tank to Tankless Conversions in Simi Valley, CA
Converting from a 40 or 50 gallon tank to tankless frees up floor space and ends standby heat loss in a garage or closet. The catch is that tankless units often need a larger gas line, often three quarter inch or bigger, plus new venting. We evaluate your meter size and pipe run before quoting so there are no surprises mid-job. We also cap or reroute the old flue and seal the roof penetration if it is no longer used. Expect a conversion to take a full day.

Navien Tankless Water Heater Replacement in Simi Valley, CA
Navien tankless water heaters are popular for their condensing technology, delivering high efficiency and performance. When it is time for a Navien tankless water heater replacement in Simi Valley, CA, you can count on FKM Plumbing. We have broad experience with Navien's advanced systems, including their combination boiler and water heater units. Our installation process focuses on optimizing your new Navien's performance, so you benefit from its energy-saving features and reliable hot water output.
Tankless Water Heater Replacement Near Me in Simi Valley, CA
If you are searching for tankless water heater replacement near me in Simi Valley, CA, FKM Plumbing is your local expert. Our service area covers the entire region, so a professional plumber is always close by when you need a new, efficient hot water solution. We pride ourselves on quick response times and reliable service for all tankless installations.
If you are searching for tankless water heater replacement near me, you want a local plumber who understands Southern California water and gas codes. FKM Plumbing serves Simi Valley with trucks loaded for tankless installs. We can often give you a firm quote after a short phone call and a few photos.
FKM Plumbing at a Glance
- Fully licensed plumbing team covering Simi Valley, CA
- 24/7 emergency service with same-day scheduling
- Upfront, flat-rate pricing before work begins
- 4.8-star rated by 754+ Southern California customers
Simi Valley Map
Simi Valley Information
- Population
- 125,113
- Area codes
- 805/747/661
- Service area
- Simi Valley and communities within 40 miles
- Nearby
- Thousand Oaks, Camarillo, Santa Clarita, Santa Monica
Replacing your tankless water heater in Simi Valley, CA is a sound investment, especially with seasonal temperature swings and the need for efficient hot water in modern homes.
Expert Services
Trust our professionals for reliable FKM Plumbing solutions in Simi Valley, CA.
Our Specialized Plumbing Services in Simi Valley, CA
At FKM Plumbing, we provide a complete range of plumbing services across Simi Valley, CA. From leak detection to full system installations, our team ensures fast, precise, and affordable service for both residential and commercial properties. Explore our core services below:
How Our Tankless Water Heater Replacement Process Works in Simi Valley, CA
We make sure every step, from initial consultation to final installation, is handled with professionalism and attention to detail.
Request a Quote
Contact FKM Plumbing today at (213) 871-0701 to schedule an on-site evaluation for your tankless water heater replacement. Our team will discuss your hot water needs and provide a detailed, transparent estimate.
Unit Selection
Based on your home's demands and existing setup, we will help you choose the right tankless water heater model. We consider factors like fuel type, flow rate and energy efficiency.
Expert Installation
Our licensed plumbers will carefully remove your old unit and install the new tankless water heater. We make sure all gas, water and vent connections meet Southern California code requirements for safety and performance.
Frequently Asked Questions About Tankless Water Heater Replacement in Simi Valley
The cost of tankless water heater replacement in Simi Valley, CA usually ranges from $3,000 to $6,000, depending on the unit's capacity, brand, complexity of installation, such as converting from a tank model, and any necessary electrical or gas line upgrades. This price usually includes the unit itself and labor. We provide a detailed, upfront quote after a thorough assessment of your home.
A standard tankless water heater replacement, if you are upgrading from an existing tankless unit, typically takes 4 to 8 hours. If you are converting from a traditional tank water heater, the process can take longer, possibly a full day, due to extra plumbing, gas or electrical changes required for proper installation and venting.
FKM Plumbing installs and replaces all major trusted brands of tankless water heaters. Our preferred brands include Rinnai, Navien, Noritz and Rheem, as they are known for their reliability, energy efficiency and long-term performance. We can also order and install other brands based on your preference or home requirements.
Yes, tankless water heaters are usually more energy-efficient than traditional tank models. They only heat water on demand, eliminating the standby heat loss that comes with keeping a large tank of water hot. This can lead to real savings on your utility bills over time, particularly in homes with varying hot water usage.
Yes. Softened or scale-treated water sharply reduces mineral buildup in the heat exchanger. We can install a scale-reduction filter if a full softener is not in your plans.
We do not recommend it. Gas line sizing, venting clearances and combustion testing require training, and improper installs can void the warranty or create carbon monoxide hazards.
A standard tankless water heater replacement usually takes between 4 and 8 hours. This timeframe can vary based on whether we are replacing an existing tankless unit with a similar model or upgrading from a traditional tank water heater. A tank conversion can call for more extensive changes to gas lines, electrical or venting.
Common signs that your tankless water heater needs replacement include frequent error codes, inconsistent water temperature, reduced hot water flow or a complete lack of hot water. If your unit is over 15 to 20 years old and repairs are becoming frequent and costly, replacement is often the more economical choice.
What People Are Saying About Our Plumbing Experts?

Emily R.
I called FKM Plumbing for plumbing repair, and the technician was fast, polite, and thorough. They explained the problem clearly and fixed it the same day. I will definitely hire them again. Highly recommended!
Plumbing Repair · Los Angeles, CA
Daniel K.
A pipe burst at 11 pm and they actually answered. The plumber showed up within the hour, shut everything down, and had us back to normal the next morning. Could not ask for more.
Emergency Plumbing · Camarillo, CA
Robert G.
The trenchless sewer replacement saved our front yard. They walked us through the camera inspection footage first so we knew exactly what we were paying for.
Sewer Line Replacement · Thousand Oaks, CA
Mark T.
When our office needed drain cleaning, FKM Plumbing provided quick, reliable service. The plumber arrived on time and made sure every drain flowed perfectly before leaving. Very satisfied.
Drain Cleaning · Los Angeles, CA
Sofia M.
Two new toilets installed in one visit, no mess left behind, and the tech even adjusted a faucet he noticed was dripping. Fair pricing and really friendly.
Toilet Installation · Santa Clarita, CA
James P.
Our commercial plumbing system had a leak under the sink, and FKM Plumbing handled it professionally. The plumbers arrived quickly and restored everything without disruption to our customers.
Commercial Plumbing · Camarillo, CA













