
Water Heater Services
Purchase Tankless Water Heater in Knoxville, TN
Guide to Tankless Water Heater Plumbers in Knoxville: Installation to Maintenance
35 years of experience
Did you know tankless water heater systems can cut your energy costs by up to 34%? That’s real money back in your pocket every month! Unlike old-fashioned tank heaters that waste energy heating water 24/7, tankless systems heat water only when you need it. No more standby heat loss – just endless hot water on demand!
These space-saving units last up to 20 years – that’s nearly twice as long as traditional tank heaters! The average Knoxville home with a tankless system saves hundreds of dollars yearly while using 27 to 50 percent less energy than typical tank models. Top brands like Navien (North America’s #1 manufacturer of gas tankless water heaters) deliver ultra-high efficiency with Uniform Energy Factors up to 0.96.
At Sanders Plumbing, we know tankless water heaters inside and out! We’re proud to be official area installers for both Navien and Rinnai. These manufacturers build commercial-grade units that deliver reliability you can count on. Our installation service includes a 6-year parts and labor warranty, with lifetime coverage options through our Preferred Service Plan.
Our guide walks you through everything about tankless water heaters – from picking the perfect system to understanding simple maintenance that keeps hot water flowing and energy bills low for years to come.
Call Sanders Today to learn how a tankless water heater can transform your home’s efficiency!

Why Knoxville Homeowners Love Tankless Water Heaters
Ever stepped into a cold shower because someone used all the hot water? That’s a nightmare we can fix! Knoxville families are discovering tankless water heaters deliver more than just endless hot water – they’re changing how homes work!
Benefits You’ll Notice Right Away
The day your tankless system gets installed, you’ll see differences traditional tanks just can’t match:
No more cold showers! Traditional heaters run out when their tank empties. Tankless systems heat water as you need it, giving you endless hot water no matter how many showers your family takes back-to-back.
So much extra space! Tankless heaters take up 80% less room than bulky tanks. Most units are about the size of a suitcase and mount on your wall. That means more storage space in your closet or utility room.
Lower bills from day one! These systems are 24%-34% more energy efficient for homes using 41 gallons or less daily, and 8%-14% more efficient for homes using around 86 gallons. A family of four saves about $95 yearly compared to standard gas models.
Cleaner water for your family! No more water sitting in a tank collecting rust and sediment – you’ll notice the difference when drinking, cooking, and bathing.
Many Knoxville homeowners fight with old tank heaters that waste energy heating water even when nobody’s home. These old units hog space and eventually leak, causing expensive water damage.
How Tankless Systems Make Life Better
Beyond the quick benefits, tankless heaters transform daily living:
Morning rush is smoother! No more scheduling showers! Everyone gets hot water without someone getting the dreaded cold surprise. Run your dishwasher, washing machine, and shower all at once without temperature problems.
Better for our environment! Using less energy means a smaller carbon footprint. Gas tankless water heaters can cut carbon dioxide emissions by 32 million metric tons over 30 years.
Reliable for decades! Tankless units typically last 20-25 years – nearly twice as long as old tank models that quit after 10-15 years. With replaceable parts, your system can last even longer with proper care.
No more “cold water sandwich”! Premium models like Navien include buffer tanks and recirculation pumps, giving consistent temperatures without the cold water bursts common in basic tankless models.
When you invest in a tankless system, you’re giving your family decades of comfort. Today’s models offer exceptional reliability – over 60% of new tankless units already meet efficiency standards that don’t even kick in until 2029.
Ready for endless hot water in your home? Call Sanders Plumbing at (865) 204-0502! Our experts will help you pick the perfect system for your family’s needs!
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Picking the Best Tankless Water Heater Installer
Choosing the wrong installer for your tankless water heater can turn your energy-saving upgrade into an expensive nightmare! The right questions asked before hiring can save you thousands and keep your warranty intact.
Questions You Need to Ask First
Before you trust anyone with your tankless water heater installation, make sure you know:
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“What certifications do you have for tankless installations?” Gas-powered models need special training. Your installer should be licensed, state-qualified, and trained on your specific brand.
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“How many tankless systems have you put in lately?” Experience counts big time! Companies installing dozens yearly know what they’re doing better than someone who only does a few.
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“Can I talk to some of your recent customers?” Good companies love sharing testimonials from happy customers.
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“Will you handle all the permits and inspections?” Professional installers should take care of all paperwork and coordinate with local authorities.
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“What exactly does your quote include?” Get everything in writing – from removing your old unit to any gas line changes needed.
Picking someone without experience often leads to efficiency problems, early system failures, and dangerous installation mistakes. Bad installations are the #1 reason warranties get voided – leaving you stuck with repair bills!
Why Sanders’ Experience with Rinnai and Navien Makes the Difference
Not all tankless water heaters work the same way. Brands like Rinnai and Navien need certified technicians who understand their specific technologies.
Our factory-trained installers know exactly what each brand requires – from proper venting to correct gas line sizing. For example, Rinnai models have different venting needs than Navien units. Only experienced technicians can handle these differences right.
Sanders Plumbing keeps up with the latest models and technologies. This knowledge ensures your system works perfectly from day one, maximizing your energy savings and hot water supply.
Remember – manufacturers often limit warranty coverage to installations done by authorized technicians. Hiring Sanders provides real protection for your investment.
Our Warranty Beats the Competition
Warranty coverage varies widely between companies. Standard warranties typically cover parts but drop labor coverage after just one year. Even “small” repairs could cost hundreds in labor if not covered!
Sanders Plumbing offers much better coverage than typical manufacturers. Our 6-year parts AND labor warranty gives you substantially more protection than standard offerings.
Want ultimate peace of mind? Our lifetime warranty option through the Sanders Preferred Service Plan eliminates worry about future repair costs completely. This plan covers all parts and labor for as long as you own your home – unbeatable value!
Most warranties require annual professional servicing to stay valid. By choosing Sanders, you get affordable maintenance plans that keep your warranty intact while maximizing system life.
Our service plans include priority scheduling, better pricing on replacement parts, and regular system check-ups.
Call Sanders Today at (865) 204-0502 to learn about our tankless water heater installation services backed by the best warranty in Knoxville!

What To Expect During Your Tankless Water Heater Installation
Wondering what happens when Sanders installs your new tankless water heater? Our professional plumbers follow a step-by-step process that gets your endless hot water flowing with minimal disruption to your home!
First Step: Getting Your Home’s Needs Right
Before we touch a single pipe, our experts visit your home to figure out exactly what system works best for you. During this visit, we check:
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How much water your family uses daily
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How many showers, faucets, and appliances might run at the same time
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Your groundwater temperature (important for proper sizing!)
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Whether your current gas lines can handle the new system
Getting these details right means your new system will deliver all the hot water you need! For example, if you’re running a shower (2 GPM), dishwasher (1.5 GPM), and washing machine (1.5 GPM) at the same time, you’ll need a system that can handle at least 5 GPM of flow.
Installation Day: Quick and Clean Service
When our Sanders technicians arrive, we protect your floors and create clear pathways to work safely in your home. The typical installation takes 4-6 hours, and here’s what happens:
First, we safely drain and disconnect your old water heater. This usually takes about 60-90 minutes.
Next comes the most important part – proper gas line sizing. Most homes need upgraded gas lines because tankless units need more BTUs than old tank systems. Getting this right prevents future problems!
After mounting your new compact unit on the wall, we connect all water lines, install necessary valves, and set up the venting system – a crucial safety component that must be done correctly.
After Installation: Making Sure Everything’s Perfect
Our job isn’t done when the unit’s on the wall! Our Sanders technicians will:
Test your system under different conditions to make sure the water temperature stays consistent Check all safety features thoroughly Fine-tune settings specifically for your home’s conditions
Before we leave, we’ll spend 30-45 minutes showing you how to adjust temperatures, handle basic troubleshooting, and maintain your system for peak performance. We’ll also explain the county inspection process that verifies everything meets safety codes.
At Sanders Plumbing, our entire installation process is backed by our 6-year parts and labor warranty, with lifetime options through our Preferred Service Plan.
Ready for endless hot water without the hassle? Call Sanders Today at (865) 204-0502 to schedule your consultation!
Maintaining Your Tankless Water Heater
Is your tankless water heater performing at its best? Regular maintenance keeps your system running efficiently for years to come! With proper care, tankless systems can serve your family for up to 20 years – nearly double the lifespan of old-fashioned tanks.
Keep Your System Running Smoothly
Don’t let your tankless investment go to waste! Schedule these simple tasks yearly:
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Flush out mineral buildup – Hard water leaves deposits that can damage your system
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Clean the air filter – Dirty filters make your system work harder than it should
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Check water filters – Clogged filters cut your water pressure and strain your heater
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Inspect venting pipes – Blocked vents are dangerous and hurt performance
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Look at gas connections – Loose fittings waste money and create hazards
Many homeowners forget these quick maintenance tasks. Don’t be one of them! Without yearly cleaning, mineral deposits can permanently damage expensive parts, leading to costly repairs.
Spot Problems Before They Get Expensive
Notice any of these warning signs? Call Sanders right away:
Water pressure dropping – Usually means minerals are building up in your pipes Lukewarm showers – Could be sediment problems or burner issues System shutting down – Often happens with clogged filters Appliances acting strange – Your dishwasher or washing machine might be telling you something’s wrong Temperature going hot and cold – Might be a sensor problem or gas line sizing issue
Sanders Makes Maintenance Easy!
Why worry about maintenance when Sanders Plumbing can handle it all? Our expert technicians know exactly what your Navien or Rinnai system needs to run perfectly. We’re factory trained on every model we install!
Our maintenance service keeps your warranty valid – many manufacturers demand professional servicing to maintain coverage. With our 6-year parts and labor warranty and lifetime options through our Preferred Service Plan, you’ll enjoy worry-free hot water for decades.
Call Sanders Today at (865) 204-0502 and protect your tankless investment with our expert maintenance service!
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Schedule Service with Us Today
Ready to fix that leak or tackle that to-do list? Give us a ring and let’s get your plumbing back in perfect flow – fast and friendly!
Why Choose Sanders for Your Tankless Water Heater?
Picking the right plumber for your tankless water heater makes all the difference between years of happy hot showers and endless headaches! Sanders Plumbing stands out in Knoxville as the tankless water heater experts you can trust.
We’re Official Navien and Rinnai Installers
Not just any plumber can install these systems right. Sanders Plumbing is an official installer for both Navien and Rinnai – North America’s top tankless water heater brands. This means:
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Our technicians get direct factory training on the newest models
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We get first access to parts and product innovations
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We know installation techniques that maximize efficiency and lifespan
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We properly size systems for Knoxville’s specific climate
Manufacturer authorization means your installation follows exact specifications – no warranty-voiding mistakes that often happen with DIY or general plumbing companies.
Our 6-Year Parts AND Labor Warranty
Most warranties cover parts for 5-10 years but only labor for 1 year. Sanders Plumbing gives you complete protection with our 6-year parts AND labor warranty! This is huge when you consider labor is often the most expensive part of repairs.
Our exclusive warranty covers:
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All internal components including heat exchangers and controls
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Complete diagnostic services
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All labor costs for qualified repairs
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Priority scheduling when you need service
You avoid those surprise repair bills that show up right after standard labor warranties expire – exactly when problems typically start happening.
Lifetime Protection with Our Preferred Service Plan
Want the ultimate peace of mind? Our Sanders Preferred Service Plan gives you lifetime warranty coverage that can’t be beat:
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Complete parts and labor coverage as long as you own your home
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Annual maintenance to prevent efficiency loss
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Priority 24/7 emergency service
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Transferable coverage that adds value to your home
Sanders prevents the system failures that frustrate so many tankless water heater owners who chose less qualified installers.
Ready for endless hot water backed by Knoxville’s best warranty? Call Sanders today at (865) 204-0502!
Why Choose Sanders Plumbing
Exceeding your expectations, consistently
100% Satisfaction
We’re not happy until you’re thrilled – your satisfaction is always our top priority.
Upfront Pricing
No surprises here – just honest, transparent pricing before the work begins.
Dedication
Our team stays sharp and certified, so you always get expert service you can trust.
24 / 7 Emergency
Day or night, rain or shine, we’re here for you when plumbing problems just can’t wait.