Tankless Water Heater Installation in St. Peters, MO
Say goodbye to cold showers in St. Peters, MO. Our experienced team at FGV Plumbing specializes in tankless water heater installation, offering a modern solution for your hot water needs.
- Gas Line Upgrades Included
- Factory-Trained Installers
- Fast, Efficient Installation
- Prompt, Reliable Installation
Get Your New Tankless Water Heater in St. Peters, MO.
Call FGV Plumbing today for a consultation and learn the benefits of a tankless water heater for your home.
Trusted Tankless Water Heater Installation in St. Peters, MO
FGV Plumbing specializes in professional tankless water heater installation for homeowners across St. Peters, MO. We help you move from traditional tank-style heaters to modern, energy-efficient tankless units that provide hot water on demand.
Our expertise includes:
- Code-compliant electrical and water line hookups.
- Gas line upsizing and meter capacity checks for high BTU demand
- Accurate sizing and model selection for your home.

Additional Plumbing Installation Services in St. Peters, MO
We install water heaters, pumps, lines, and fixtures across St. Peters, MO with precision workmanship that meets every local code.

Customers
Why Choose FGV Plumbing for Tankless Water Heater Installation in St. Peters, MO?
Our team understands how water hardness and seasonal temperature swings affect tankless performance. Water in much of Missouri is moderately hard to hard, so scale gradually builds in water heaters, faucets and fixtures. We will guide you through the process, from selection to final setup, with transparency and expertise.
- Scale Protection, Isolation valves and scale filters protect the heat exchanger from hard water.
- Energy Efficiency, Tankless units heat water only when needed, which can lower your utility bills compared to traditional storage tanks.
- Longer Lifespan, Tankless water heaters typically last longer than conventional models, offering a better long-term investment.
Citywide Coverage
We install tankless water heaters in homes throughout St. Peters, mounting them in garages, utility closets and on exterior walls. Exterior installs save indoor space and make for simpler venting in many homes.
Experienced Team
Our team of licensed plumbers brings deep experience with tankless water heater installations in Missouri homes. They are trained on current models and techniques, delivering a reliable and up-to-code setup for your property.
Safety-First Approach
Safety and code compliance come first on every tankless water heater installation we perform. Our plumbers carefully follow manufacturer guidelines and local Missouri plumbing codes, including proper venting, gas line and electrical connections.
Trusted Certified St. Peters Plumbing Services Professionals
At FGV Plumbing, we take pride in providing certified plumbing services throughout St. Peters, MO. 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 CertificationReliable Tankless Water Heater Installation Services in St. Peters, MO
Tank to Tankless Conversions in St. Peters
Converting from a tank requires more than swapping units. A 40 gallon tank heater uses roughly 40,000 BTU, while a whole-home tankless unit may need up to 199,000 BTU, so the gas line often needs to be upsized. Venting changes from a metal flue to PVC or stainless, and the unit moves to a wall location. We remove and haul away your old tank and patch the old flue penetration.

Residential Tankless System Upgrades in St. Peters
Upgrading your traditional hot water tank to a tankless system in St. Peters can significantly improve efficiency and comfort. We assess your home's hot water demands, existing plumbing and utility connections to recommend the best tankless model for your household size and usage patterns. Our team manages the entire conversion, including the safe removal and disposal of your old water heater, limiting disruption to your daily routine.
Hard Water Protection for Tankless Units in St. Peters, MO
Calcium scale is the leading cause of tankless heater failure. Water in much of Missouri is moderately hard to hard, so scale gradually builds in water heaters, faucets and fixtures. Scale coats the heat exchanger, reducing efficiency and triggering error codes. We install isolation valves so the unit can be flushed with a vinegar or descaling solution once a year. A scale inhibitor cartridge or whole-home softener provides extra protection.
Navien Tankless Water Heater Installation in St. Peters
Navien is a leading brand known for its advanced condensing technology and strong energy efficiency. FGV Plumbing is skilled in the precise installation of Navien units in St. Peters homes, setting them up for maximum savings and comfort. These advanced systems require expert setup to work at their best, and our team is proficient in all Navien models.
Tankless Water Heater Replacement in St. Peters, MO
If your old tankless unit is failing or you are upgrading from a traditional tank, FGV Plumbing offers seamless tankless water heater replacement. We carefully remove the old unit, make any necessary adjustments to plumbing and venting and install your new, more efficient model. Our goal is to make the transition as smooth as possible, ensuring continuous hot water in your St. Peters, MO home.
Commercial Tankless Water Heater Installation in St. Peters
Businesses often have higher and more consistent hot water demands than homes. FGV Plumbing provides commercial tankless water heater installation, sizing systems to meet the needs of restaurants, salons or other commercial spaces. We understand the value of minimal disruption to your operations during installation, providing a quick and professional setup in St. Peters.
Rinnai Tankless Water Heater Installation in St. Peters, MO
Rinnai tankless water heaters are a popular choice for their reliability and long lifespan, making them a smart investment for homeowners across St. Peters, MO. Our plumbers are factory-trained on Rinnai systems, ensuring a clean installation that follows all manufacturer specifications. We make sure gas line sizing, venting and water connections are correct so your Rinnai unit provides endless hot water reliably for years.

Residential Tankless Water Heater Installation in St. Peters
FGV Plumbing focuses on installing tankless water heaters for residential properties. We assess your home's hot water demands, family size and existing utility connections to recommend the most suitable unit, so you get the right capacity for your needs. Our installations are designed to be energy efficient, providing endless hot water while often lowering your monthly utility bills in St. Peters.
Tankless Water Heater Installation Near Me in St. Peters, MO
Our local presence means faster response times and a team that understands the challenges and opportunities for tankless systems in St. Peters. We are committed to bringing modern, efficient hot water to every home in our community.
When you search for 'tankless water heater installation near me' in St. Peters, MO, FGV Plumbing is your reliable local choice. We know the local plumbing and building codes thoroughly, so every installation is done right the first time.
FGV Plumbing at a Glance
- Fully licensed plumbing team covering St. Peters, MO
- 24/7 emergency service with same-day scheduling
- Upfront, flat-rate pricing before work begins
- 4.9-star rated by 307+ Missouri customers
St. Peters Map
St. Peters Information
- Population
- 59,413
- Area codes
- 636/314/573
- Service area
- St. Peters and communities within 40 miles
- Nearby
- St. Charles, O'Fallon, Chesterfield, Ballwin
Installing a tankless water heater in St. Peters, MO can significantly boost energy efficiency and provide endless hot water, a valuable upgrade for homes dealing with hard water and changing seasonal demand.
Expert Services
Trust our professionals for reliable FGV Plumbing solutions in St. Peters, MO.
Our Specialized Plumbing Services in St. Peters, MO
At FGV Plumbing, we provide a complete range of plumbing services across St. Peters, MO. 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 Installation Process Works in St. Peters, MO
We follow a clear process so your tankless installation is sized right, installed safely and ready to go.
Request a Quote
Contact FGV Plumbing at (816) 330-2338 to schedule a free consultation. We will discuss your hot water needs and assess your home's specific requirements for a tankless system.
On-Site Assessment
Our expert plumber will visit your St. Peters home to evaluate your current setup, determine the best tankless model and provide a detailed, transparent estimate.
Professional Installation
Once approved, our certified technicians will install your new tankless water heater, making sure all gas, water and vent connections are up to code and fully working.
Frequently Asked Questions About Tankless Water Heater Installation in St. Peters
The cost of tankless water heater installation in St. Peters typically ranges from $2,500 to $4,500, including the unit and labor. This can vary based on the model, fuel type (gas or electric) and any necessary upgrades to your gas lines or electrical panel. We provide a detailed, upfront quote after an on-site assessment.
Yes, tankless water heaters are very energy efficient in almost any climate. Water heaters face heavy demand in winter, when incoming water is cold and households use more hot water. Since they only heat water on demand, they avoid the standby heat loss common with traditional tanks, which can be significant even in milder seasons.
Absolutely. When properly sized, a tankless water heater can provide an endless supply of hot water, even for large families. It is important to select a unit with a high enough GPM (gallons per minute) rating to meet your peak demand.
No, we strongly advise against DIY tankless water heater installation. These systems involve complex connections for gas, water and electricity, along with specific venting requirements. Improper installation can lead to safety hazards, void warranties and costly repairs. Always hire a licensed professional.
While it may seem appealing, tankless water heater installation is complex and should only be performed by a licensed professional. It involves gas lines, high-voltage electricity, water connections and intricate venting systems, all of which require specialized knowledge and adherence to safety codes. Incorrect installation can be dangerous and void warranties.
We install Rinnai, Navien, Noritz and Rheem tankless water heaters. Each brand offers different features, efficiency levels and warranty terms.
A straight replacement takes four to six hours. Tank to tankless conversions with gas and venting changes usually take a full day.
To maintain efficiency and extend the lifespan of your tankless unit, annual flushing to remove mineral buildup is recommended, especially in areas with hard water. Checking and cleaning the air filter (for gas models) and inspecting connections are also part of regular maintenance. FGV Plumbing offers comprehensive maintenance services.
What People Are Saying About Our Plumbing Experts?

Mark T.
When our office needed drain cleaning, FGV Plumbing provided quick, reliable service. The plumber arrived on time and made sure every drain flowed perfectly before leaving. Very satisfied.
Drain Cleaning · O'Fallon, MO
Emily R.
I called FGV 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 · St. Charles, MO
Patricia H.
We had a slab leak that two other companies could not find. FGV Plumbing located it in under an hour, explained our options, and the price matched the quote to the dollar.
Slab Leak Repair · Wentzville, MO
Laura S.
I scheduled a water heater replacement, and the team made the process smooth and affordable. The new unit works perfectly, and they cleaned up after completing the job.
Water Heater Replacement · Chesterfield, MO
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 · Chesterfield, MO
James P.
Our commercial plumbing system had a leak under the sink, and FGV Plumbing handled it professionally. The plumbers arrived quickly and restored everything without disruption to our customers.
Commercial Plumbing · O'Fallon, MO













