Cities We Serve
Austin Area:
San Antonio Area:
Not seeing your area? Give us a call at (833) 656-4056
The Most Used Fixture in the House
A Toilet Has Five Parts That Fail. We Carry All of Them.
Nearly every toilet complaint comes down to a short list: the fill valve that refills the tank, the flapper that seals it, the flush valve seat the flapper rests on, the wax ring that seals the bowl to the drain, and the bolts and supply line that hold it all together. Each one has its own symptom. A toilet that runs on and off overnight is a flapper. A toilet that rocks or leaves water at the base is a wax ring or loose bolts. A toilet that clogs every week is usually a low-flow model from the early years of the rule, or a partial obstruction in the trap that a plunger never fully clears.
Radiant’s plumbers stock the parts for all of it and fix most toilets in a single visit, across Austin, San Antonio and Central Texas. Our hard water is rough on fill valves and flappers, so those wear faster here than the packaging suggests, and mineral crust in the rim jets is a common reason an older toilet flushes weakly. We will tell you when a repair makes sense and when a modern toilet will flush better, use less water and stop the cycle of service calls.
Toilet work is priced in writing before we start, honored for 72 hours, and backed by the Home Comfort Guarantee. If it is overflowing right now, close the supply valve behind the toilet and call; we answer 24/7.
- Parts on the truck Fill valves, flappers, flush valves, wax rings, bolts and supply lines, so most repairs are one visit.
- Repair or replace, priced side by side We show you the cost of fixing the toilet you have and the cost of a new one, and let you choose.
- Home Comfort Guarantee If we cannot resolve the problem, you receive a 10% inconvenience refund, up to $1,000.
What to Watch For
Toilet Symptoms and the Part Behind Each One
Toilets are honest. Each thing they do wrong points at one specific part.
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Runs for a few seconds every so often
The flapper is leaking water into the bowl and the fill valve tops the tank back up. It can waste a surprising amount of water a month.
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Hisses or never quite stops filling
A fill valve that is worn or set too high, sending water down the overflow tube. Hard-water grit in the valve is the usual cause.
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Water at the base after a flush
A failed wax ring or a cracked flange. Water is going under the floor, not just on it. Worth fixing this week, not this year.
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Rocks when you sit down
Loose closet bolts, a broken flange or an uneven floor. Rocking breaks the wax seal, which leads straight to the leak above.
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Weak flush or clogs constantly
Scaled rim jets, a partial obstruction in the trap, or an early low-flow toilet that never flushed well. We can tell which by looking.
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Bubbles, or the tub fills when you flush
The toilet is fine; the drain line past it is blocked. That is a call about the drain or sewer line, and it should not wait.
What We Handle
Toilet Repairs, Replacements and Upgrades
From a new flapper to a new toilet, plus the flange and floor repairs that sometimes come with it.
- Tank rebuilds Fill valves, flappers, flush valves, handles and tank-to-bowl gaskets, replaced together when the tank is due.
- Wax ring and flange repair Resealing the bowl to the drain, repairing broken or corroded flanges and correcting a flange that sits too low after new flooring.
- Clogs and obstructions Clearing what the plunger cannot, including toys and wipes lodged in the trap, without scratching the bowl.
- New toilet installation Standard, comfort-height, one-piece and dual-flush models installed with a new wax ring, bolts and supply line.
- Bidet seats and bidet toilets Adding the water connection and, where needed, coordinating the outlet for powered seats, so the install is clean and code-right.
- Supply lines and shutoffs Replacing brittle supply lines and stuck stops so you can actually shut the water off when a toilet misbehaves.
- Leak tracing Dye tests and floor checks to prove whether the toilet is the source of a stain below, or something else is.
How It Works
What Happens When You Call About a Toilet
Quick to diagnose, quick to price, and usually done before the plumber’s coffee gets cold.
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Tell us what it is doing
Running, leaking, rocking, clogging, or nothing at all. If it is overflowing, we will talk you through the shutoff first.
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We check the tank, the base and the flush
A dye test for flapper leaks, a look at the bolts and seal, and a flush to judge the trap and rim jets.
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You get the price in writing
Repair or replacement, both spelled out. We recommend one, you decide, and the quote holds for 72 hours.
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We fix it and flush it, a lot
Multiple test flushes, a check for water at the base, and the old parts or old toilet taken away.
Current Specials
Save on the work your home needs most.
Only One Bathroom and It Is Down?
That counts as urgent to us. Plumbers on call 24/7 across Austin and San Antonio, no surprise fees.
What Our Customers Say
Don't just take our word for it — hear from our satisfied customers
★★★★★
I had Radiant Plumbing replace my tankless water heater, damaged in the Feb. 2021 snowmageddon storm with a new unit. The process was smooth and professional from start to finish. The plumber, James, was extremely knowledgeable and thoroughly explained my options to me. The cost and time to perform the installation were just as estimated. When he was done, James explained how to maintain the system, what service would be needed and how to perform it, and answered all of my engineering geek questions. It was a thoroughly positive experience. I have used several different plumbers in Austin over the past 15 yrs, but my search is over - I will not hesitate to call Radiant next time and would recommend them unreservedly.
8/9/23 Update: I have subsequently used Radiant for a toilet repair, faucet installation (Danny), and drain work (Ezekiel) and they have continued to impress with knowledgeable, friendly plumbers and quality work.
8/9/23 Update: I have subsequently used Radiant for a toilet repair, faucet installation (Danny), and drain work (Ezekiel) and they have continued to impress with knowledgeable, friendly plumbers and quality work.
★★★★★
We called Radiant Plumbing after we noticed a water leak in our kitchen. We were in a time crunch and they were able to schedule us quickly, before we left for vacation. They sent their representative, Preston Nichols, and he was excellent to deal with! He was on time, skillful, friendly, and very professional. It turned out to be a problem with our dishwasher but Preston was quick to diagnose it and set our minds at ease. While he was here, we mentioned that our one year-old water heater needed to be flushed. Preston was quick to take care of that, as well, saving us time and money in the process. Radiant charged us almost half the price another plumber quoted us for that service! While Radiant Plumbing isn’t our usual plumber, they gained a new customer. We won’t hesitate to call Radiant again in the future based on our VERY positive experience with them.
★★★★★
Had 3 different systems installed by them approx. 3 years ago for a total of approx $20k. I was quite happy with the install until the year later when they came for a maintenance call and started finding deficiencies in their own install. they wanted extra money to address those deficiencies. Now I am in the process of selling my home and an inspector has found a few items that need to be addressed and they will not even look at the report unless I schedule a $139.00 service call. Very poor customer service.. This company does not stand by their work and would not recommend.
I am revising my review of this business from 1 to 5 stars. After my original review I was contacted by the company's service manager and he made sure that I was taken care off. I had a team of 3 technicians coming to my house to double check the system and make the necessary adjustments. I was very satisfied by their attention to details and professionalism.
I am revising my review of this business from 1 to 5 stars. After my original review I was contacted by the company's service manager and he made sure that I was taken care off. I had a team of 3 technicians coming to my house to double check the system and make the necessary adjustments. I was very satisfied by their attention to details and professionalism.
Maintenance Membership
Join the Care Club
Home maintenance for $9.99 a month.
Care Club members get two HVAC tune-ups and a plumbing safety inspection every year, priority scheduling, no dispatch fees — ever — and 5% off every repair.
- Priority scheduling
- Seasonal HVAC tune-ups
- Annual safety inspection
- Exclusive member discounts
- Free dispatch on repairs
- No long-term contracts
Toilet Questions
Why does my toilet run by itself every few minutes?
The flapper is leaking. It is the rubber seal at the bottom of the tank, and when it gets warped, coated with minerals or chewed up by in-tank cleaner tablets, water seeps past it into the bowl. The tank level drops, the fill valve kicks on for a few seconds, and the cycle repeats all day and night. You can confirm it by putting a few drops of food coloring in the tank and waiting fifteen minutes without flushing; color in the bowl means the flapper. A new flapper is a small repair, but a leaking one can waste a large volume of water a month, so it is worth doing promptly. If the flapper is new and it still runs, the flush valve seat under it is probably pitted and needs replacing.
My toilet rocks and there is water at the base. What is wrong?
The toilet is no longer sealed to the drain. A toilet sits on a wax ring pressed between the bowl and the flange in the floor; if the closet bolts loosen, the floor is uneven or the flange is broken, the bowl moves and the wax loses its seal. Every flush then pushes a little water out under the base, and it goes down into the subfloor before you ever see it on the tile. Do not just tighten the bolts; the seal is already gone. The proper fix is to pull the toilet, inspect and repair the flange, set a new wax ring and shim the bowl so it cannot rock again. If the floor around it is soft, that needs attention too, and we will tell you what we see.
Should I repair my old toilet or replace it?
Repair it if the porcelain is sound and the problem is a tank part, a seal or a clog; those are inexpensive and the toilet will keep going. Replace it if the bowl or tank is cracked, if it clogs constantly despite a clear drain line, if the rim jets are so scaled the flush is weak and cleaning does not help, or if it is one of the early low-flow toilets that never flushed well. Newer toilets flush more effectively on less water than the old ones did, so on a toilet that is both old and troublesome the replacement often pays back in water savings and in not calling us again. We price both options in writing, and we are honest about which we would pick.
Why does my toilet keep clogging even though I plunge it?
Plunging clears the immediate blockage but can leave a partial obstruction in the toilet’s trap or just past it, and everything after that catches on it. Common culprits are so-called flushable wipes, which do not break down, a small object a child dropped in, and a heavy mineral buildup narrowing the trap. A toilet auger reaches what a plunger does not. If plunging works but the toilet also bubbles or the tub drains slowly, the problem is in the drain line beyond the toilet and it needs a drain cleaning, possibly a camera inspection if it keeps recurring. A weak flush that clogs on normal use with nothing stuck is a sign the toilet itself is the problem.
Can you install a bidet seat on my existing toilet?
Yes. A bidet seat replaces your current seat and connects to the toilet’s cold-water supply with a small T-valve, which we install with a fresh supply line so the connection does not weep. Powered seats with heated water and a dryer also need a nearby outlet, which many bathrooms do not have; in the Austin area our licensed electricians can add one, and in San Antonio we will tell you what the electrician you hire needs to provide. If you want an integrated bidet toilet rather than a seat, we handle the full replacement, including the flange, wax ring and supply. Either way, the price is in writing before we start.
*Offers cannot be combined with other promotions or applied to dispatch fees. No cash value. Must present offer at time of service. Call for details.
