The Hard Knox Blog
Straight answers about water heaters, drains, water lines, and East Tennessee’s hard water — written by the people who work on them. Got a question that isn’t here? Call 865.765.8946, answered 24/7.
Latest Articles
Recent from the shop.
Do This if Your Plumbing System is Damaged Because of the Knoxville Heat
Hot summers in Knoxville don’t just stress your lawn, they can create real issues for your plumbing, too. If your water pressure drops, pipes start making noises, or an outdoor faucet won’t stop dripping,…
Tips to maintain your water heater and when to call a plumber
No hot water, cold showers, and a surprise repair bill can throw off your entire day. Luckily, keeping your water heater in good condition is easier than you…
Call a plumber if you have these common toilet problems
Let’s be honest, common toilet problems are the worst. If you’re at home or running a business, nothing throws off your day like a toilet that won’t flush…
Water Filtration Experts in Knoxville, TN and the Surrounding Areas
Clean, safe water isn’t a luxury, it’s something you need every day. Whether you’re cooking, cleaning, or filling a glass at the sink, the quality of your water…
Common Issues with Plumbing Fixtures in Knoxville, TN
Leaky faucet? Running toilet? Low water pressure driving you nuts? These may seem like minor inconveniences, but over time, they can waste water, spike your bills, and damage…
Water Line Repair in Knoxville, TN: Expert Solutions for Homeowners and Businesses
Water is an essential part of any home or business, until a leak, burst pipe, or sudden pressure drop causes major disruptions. Whether it’s a spike in your…
Quick Answers
Six questions we get every week.
Short versions. Longer answers live on the relevant service pages.
How long should a water heater last?
Eight to twelve years for a standard tank; 20+ for a well-maintained tankless unit. Hard water shortens both without an annual flush.
Why is my water pressure low everywhere?
Usually corroded galvanized supply piping or a failing pressure regulator. Both are diagnosable in one visit.
Are chemical drain cleaners safe?
Not for your pipes. They frequently fail to clear the real blockage and corrode older metal drain lines while they sit.
What causes a running toilet?
Almost always the flapper, fill valve, or float. Small repair, real savings — a running toilet can waste hundreds of gallons a day.
Is Knoxville water hard?
Yes. East Tennessee limestone means dissolved calcium and magnesium, which is why you see scale, spotting, and water heater sediment.
When should I call an emergency plumber?
Water you can’t stop, no water at all, sewage backing up, a burst pipe, or gas odor. Call 865.765.8946 — answered 24/7.
By Topic
Where to read more.
Every service page carries a full FAQ section written from the questions we actually get asked on the phone.
Water heaters
Sizing, lifespan, tankless versus tank, and the maintenance that doubles the life of either.
Read the FAQs →Drains & sewers
Why clogs recur, when a camera inspection is worth it, and what root intrusion actually does to a line.
Read the FAQs →Water lines & repiping
Hidden leaks, pressure problems, galvanized and polybutylene failures, and what replacement involves.
Read the FAQs →East Tennessee water quality
Why limestone water leaves scale on everything, and what softening and filtration actually fix.
Read the FAQs →Fixtures & small repairs
Faucets, toilets, disposals, and shutoff valves — what's worth repairing and what's worth replacing.
Read the FAQs →Preventive maintenance
The annual checks that keep small problems from becoming emergency calls at midnight.
Read the FAQs →Recommended by your neighbors.
“My cost was exactly what he told me over the phone. He was on time, cleaned up after the repair and was very courteous. Hard Knox Plumbing will always be my first call.”
“As I expected, my call was answered by someone who actually knew what my problem was. Danny was able to work me in today.”
“It was an amazing service. They were on time, on budget and great to work with. Very knowledgeable, very friendly, and a reasonable price.”
Ask A Plumber
You can also just call and ask.
We'd rather answer a question over the phone than have you guess. Hard Knox Plumbing is locally owned by Danny Ferris and Jarrett Mohn, based at 3414 Henson Rd C, Knoxville, TN 37921, and serving every home within 25 miles.
Call 865.765.8946 — a real person answers 24/7, and no, we won't try to book a visit you don't need.
Plumbing emergency?
We're open 24/7. Call us right now.
Water damage gets worse by the minute. A Hard Knox plumber answers around the clock — nights, weekends, and holidays.