Tankless Water Heater Installation in Janesville, WI
We install Rinnai, Navien, Noritz and Rheem tankless water heaters in Janesville, WI with correct sizing, clean venting and isolation valves for easy descaling.
- Energy Savings Possible
- Upfront Pricing
- Energy-Saving Systems
- Reliable Local Plumbers
Get Endless Hot Water and Free Up Floor Space in Janesville, WI.
Contact HKV Plumbing today for a free consultation and see the benefits of a new tankless system.
Your Source for Tankless Water Heater Installation in Janesville, WI
For reliable tankless water heater installation in Janesville, WI, trust HKV Plumbing. Our certified plumbers make sure your new system is sized correctly and installed to all local plumbing codes, giving you years of efficient hot water.
Our expertise includes:
- Condensing and non-condensing gas tankless units with PVC or stainless vent pipe
- Code-compliant electrical and water line connections.
- Accurate sizing and model selection for your home.

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

Customers
Why Choose HKV Plumbing for Tankless Water Heater Installation in Janesville, WI?
Our team understands how water hardness and seasonal temperature swings affect tankless performance. Water softeners are a common feature in many Wisconsin homes, helping protect water heaters, fixtures and appliances from scale. We will guide you through the process, from selection to final setup, with transparency and expertise.
- Energy Efficiency, Tankless units heat water only when needed, which can lower your utility bills compared to traditional storage tanks.
- Scale Protection, Isolation valves and scale filters protect the heat exchanger from hard water.
- Endless Hot Water, Never run out of hot water again, even with multiple showers or appliances running at once.
Citywide Coverage
We install tankless water heaters in homes throughout Janesville, mounting them in garages, utility closets and on exterior walls. Exterior installs save indoor space and simplify venting in many homes.
Experienced Team
Every technician at HKV Plumbing is committed to ongoing education, staying current with advances in tankless technology and local plumbing codes. This training supports a safe, reliable and high-performing installation.
Safety-First Approach
Tankless units must be vented correctly to remove combustion gases safely, and we follow manufacturer clearance and termination requirements. Condensing units get a proper condensate drain and neutralizer when needed.
Trusted Certified Janesville Plumbing Services Professionals
At HKV Plumbing, we take pride in providing certified plumbing services throughout Janesville, WI. 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.
Call Us Now
PHCC Plumbing Contractor Recognition
Better Business Bureau (BBB) Accreditation
Angi Certified Pro
ISO 9001 Quality Management CertificationReliable Tankless Water Heater Installation Work in Janesville, WI
Cost-Effective Tankless Conversions in Janesville, WI
While the initial cost of a tankless water heater installation in Janesville, WI may be higher than a traditional tank, the long-term energy savings and longer lifespan often make it a more cost-effective solution. We provide detailed estimates, outlining the benefits and available rebates, to help you make an informed decision for your home. Our installations are designed for maximum efficiency, putting money back in your pocket.

Tank to Tankless Conversions in Janesville
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 dispose of your old tank and patch the old flue penetration.
Residential Tankless Water Heater Installation in Janesville
HKV 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 Janesville.
Hard Water Protection for Tankless Units in Janesville, WI
Calcium scale is the leading cause of tankless heater failure. Water softeners are a standard feature in many Wisconsin homes, helping protect water heaters, fixtures and appliances from scale. 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.
Tankless Water Heater Replacement in Janesville, WI
If your old tankless unit is failing or you are upgrading from a traditional tank, HKV Plumbing offers smooth 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, keeping continuous hot water in your Janesville, WI home.
Tankless Water Heater Relocation in Janesville
Sometimes the best spot for a tankless water heater is not where your old tank was located. For homeowners in Janesville looking to free up space or improve access, HKV Plumbing offers professional tankless water heater relocation. This can involve rerouting gas or water lines and possibly electrical work, all handled with care and to local codes by our experienced team.
Commercial Tankless Water Heater Installation in Janesville
Businesses often have higher and more consistent hot water demands than homes. HKV 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, ensuring a quick and professional setup in Janesville.

Gas Tankless Water Heater Installation in Janesville
For many homes in Janesville, gas tankless water heaters are a common choice due to their powerful heating and lower operating costs compared to electric models. Our licensed technicians handle all aspects of gas line connections, venting and combustion air requirements, so your system operates safely and efficiently. We work with leading brands like Rinnai and Noritz to provide high-performance, on-demand hot water.
Tankless Water Heater Installation Near Me in Janesville, WI
When you search for 'tankless water heater installation near me' in Janesville, WI, HKV Plumbing is your reliable local choice. We know the local plumbing and building codes well, so every installation is done right the first time.
Our local presence means faster response times and a commitment to serving our neighbors in Janesville. You can trust HKV Plumbing to provide timely, professional and courteous service for all your tankless water heater needs, right in your neighborhood.
HKV Plumbing at a Glance
- Fully licensed plumbing team covering Janesville, WI
- Same-day appointments and 24/7 emergency response
- Upfront, flat-rate pricing before work begins
- 4.8-star rated by 448+ Wisconsin customers
Janesville Map
Janesville Information
- Population
- 66,102
- Area codes
- 608/920/815
- Service area
- Janesville and communities within 40 miles
- Nearby
- Madison, Waukesha, West Allis, Wauwatosa
Installing a tankless water heater in Janesville, WI is a smart investment through warm and chilly seasons alike, delivering consistent hot water without the energy waste of heating a large tank year-round.
Expert Services
Trust our professionals for reliable HKV Plumbing solutions in Janesville, WI.
Our Specialized Plumbing Services in Janesville, WI
At HKV Plumbing, we provide a complete range of plumbing services across Janesville, WI. 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 Installation Process Works in Janesville, WI
We aim for a stress-free experience, making sure your new tankless system is installed correctly and safely for years of reliable hot water.
Request a Quote
Call (414) 432-4641 to schedule a site visit. We assess your fixtures, gas supply and venting options, then give you a written quote.
Install and Upgrade
We remove your old heater, upsize gas lines if needed and mount the new unit. Venting, water connections and isolation valves are installed to manufacturer specs.
Test and Train
We fire the unit, check gas pressure and test hot water at several fixtures. Then we show you how to flush the system and register your warranty.
Frequently Asked Questions About Tankless Water Heater Installation in Janesville
The cost of tankless water heater installation in Janesville 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.
Tankless units eliminate standby heat loss, which can lower water heating energy use. Savings vary based on household size and usage patterns.
Size depends on how many fixtures run at once and your incoming water temperature. Many homes need a unit rated around 7 to 10 gallons per minute.
Fluctuating water temperature, error codes, reduced flow and unusual noises are common signs. Scale buildup is often the cause in hard water areas.
A straight replacement takes four to six hours. Tank to tankless conversions with gas and venting changes typically take a full day.
A standard tankless water heater installation, replacing an existing tank, usually takes 4 to 8 hours. If extensive plumbing or gas line changes are required, it may take a full day. Our team works efficiently to restore your hot water as quickly as possible.
Many manufacturers offer 10 to 15 year heat exchanger warranties and shorter coverage on parts. We also warranty our installation labor.
No, we firmly 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 use a licensed professional.
What People Are Saying About Our Plumbing Experts?

Emily R.
I called HKV 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 · Waukesha, WI
Patricia H.
We had a slab leak that two other companies could not find. HKV Plumbing located it in under an hour, explained our options, and the price matched the quote to the dollar.
Slab Leak Repair · West Allis, WI
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 · Janesville, WI
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 · Madison, WI
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 · Milwaukee, WI
Mark T.
When our office needed drain cleaning, HKV Plumbing provided quick, reliable service. The plumber arrived on time and made sure every drain flowed perfectly before leaving. Very satisfied.
Drain Cleaning · Waukesha, WI













