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When your water heater goes cold, you need service that’s fast, professional, and built on real expertise. At Radiant Plumbing & Air Conditioning, we’ve repaired thousands of water heaters across San Antonio—from older tank models in established neighborhoods to modern tankless systems in new homes. Our licensed plumbers arrive with the tools, training, and know-how to diagnose the problem and fix it right the first time.
We understand how San Antonio’s hard water, aging pipes, and long hot seasons affect your system—and we tailor our repairs accordingly. Whether it’s a heating element, a faulty thermostat, or sediment buildup, we’ll walk you through the issue and offer upfront pricing before any work begins.
You shouldn’t have to wait days to get your hot water back. With 24/7 service and a team that shows up ready, Radiant delivers water heater repairs San Antonio homeowners can trust.
Most water heater failures start small—corrosion, sediment buildup, a tired thermostat—and go unnoticed until there’s no hot water. That’s where the Radiant Care Club steps in. As a member, you get an annual plumbing inspection from a licensed expert who knows what to look for inside and around your water heater. We flush sediment, test components, and spot early warning signs before they lead to expensive repairs or full replacement.
Care Club members also skip the dispatch fee, get priority scheduling, and enjoy 10% off most plumbing services—including water heater repairs and replacements. Whether you have a traditional tank model or a tankless system, regular maintenance helps your unit last longer and run more efficiently.
In San Antonio’s hard water environment, that extra care makes all the difference. Join the Care Club and keep the hot water flowing—without the surprise breakdowns.
When your water heater’s on the fritz, you don’t just need a fast fix—you need one that lasts. At Radiant Plumbing & Air Conditioning, every repair is backed by our Home Comfort Guarantee, giving San Antonio homeowners the peace of mind they deserve. That means clear, upfront pricing before work begins, and no hidden fees—ever.
Our licensed, background-checked plumbers know how to repair both traditional and tankless systems safely and correctly, the first time. If something isn’t right after we’ve finished, we’ll come back at no cost to make it right. And if we can’t resolve it to your satisfaction, we’ll offer a 10% inconvenience refund—up to $1,000.
Your comfort, your trust, and your hot water are all protected under the Home Comfort Guarantee. Because at Radiant, doing the job right isn’t just a promise—it’s our standard.
Thousands of Austin and San Antonio residents have trusted Radiant Plumbing & Air Conditioning as their full-home service provider for all their maintenance and repair needs. Discover our others services – like air conditioning and plumbing.
We proudly service the following cities and neighborhoods across San Antonio, TX:
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Hot water outages in San Antonio usually trace back to two culprits: hard water scale from the Edwards Aquifer and long cooling seasons that bake attic-installed equipment. Radiant troubleshoots fast with transparent pricing and clean workmanship, whether your home has a tank in the garage, a tankless on an exterior wall, or a light-commercial setup serving a small office or café. Our licensed plumbers restore hot water, protects against repeat failures, and explains your options clearly.
Here’s what we see locally: mineral scale cakes heating surfaces and sensors, causing rumbling tanks, longer heat times, fluctuating temps, and error codes on tankless units. We descale heat exchangers, check anodes, and verify gas pressure and combustion for CPS Energy-served appliances. Many San Antonio homes have pressure-reducing valves; when those are present, an expansion tank is required, and failed or waterlogged tanks lead to T&P valve dripping and premature heater wear. Attic installs need proper drip pans and safe T&P discharge runs to prevent ceiling damage, especially during those sudden winter cold snaps that can trigger leaks on rarely-cycled valves. For larger ranch-style homes, we evaluate recirculation pumps to cut wait times and water waste (a plus during drought restrictions). For light commercial clients, we handle high-recovery tanks, mixing valves for safe delivery temps, and code documentation to keep you open.
When you need more than water heater repair, explore some of our other San Antonio services:
From no-hot-water calls and leaking tanks to tankless error codes and safety valve issues, Radiant fixes the root cause and helps you prevent the next surprise—backed by clear communication and fair, upfront pricing. When you need dependable water heater repair in San Antonio, We Answer the Call.
