Mobile RV repair across the Hill Country and the I-35 corridorMobile RV repair in San Marcos, TX
River Cities RV Service
RV water heater compartment open for service, RV plumbing and water heater repair
Our Services

RV Plumbing and Water Heater Repair in San Marcos, TX

RV Plumbing and Water Heaters · San Marcos, TX

Hot water back on, right where your RV sits

A cold shower or a puddle under the sink means something in the RV's plumbing has failed. River Cities RV Service handles RV water heater repair and RV plumbing repair where your RV sits. We come to you across the Hill Country and the I-35 corridor. You can also bring the RV to our San Marcos shop.

Plumbing work follows the same steps as all of our mobile RV repair in San Marcos. The service call covers the diagnosis and the trip to your site. Once we find the fault, you get the written quote for the repair. When the fix needs a part, we order it and finish the job when it arrives.

What We Handle

  • RV water heater repair on the propane side and the electric side
  • Elements, igniters, burners, relief valves and anode rods replaced
  • New water heaters installed, tank or tankless, when the old one is done
  • RV water pump repair and replacement for pumps that run on or will not prime
  • Tank valves and lines on the fresh, gray and black tanks
  • Leaks traced along supply lines and fittings, then repaired
  • Faucets, shower valves, RV toilets and drain lines repaired, plus clogs cleared
  • Split lines and fittings replaced after a freeze

Request an RV Plumbing and Water Heaters Quote

Tell us about your RV, what is wrong and where it is parked. We diagnose the problem and put the repair quote in writing.

RV water heater repair on propane and electric

Some RV water heaters run on propane alone, and others add a 120-volt electric element. When hot water fails on one source only, the fault sits on that side. On propane we test the igniter, the burner, the gas valve and the high-limit switch. Sometimes the trouble sits upstream at the regulator, part of our RV propane system service.

On electric we test the element, its switch, the thermostat and the breaker. One water heater maker's manual names the most common electric failure: switching the element on before the tank is full. Even a short run on an empty tank can burn the element out. A tank left in bypass after winter stays empty, so the same thing can happen.

When the tank itself leaks, the heater is usually done. We install a new one, either a tank unit or a tankless unit that heats water as it flows. Worn parts like elements and relief valves can be replaced without a new heater. Water heater checks are also part of every RV annual maintenance visit.

Why does my RV water pump keep running?

The water pump in an RV is usually a 12-volt pump with a built-in pressure switch. It starts when a faucet opens and stops once the lines reach pressure. When it keeps running with every faucet closed, pump makers point to a short list of causes. It includes an empty fresh tank, a leak on the outlet side, a torn diaphragm and a worn pressure switch.

A pump that kicks on by itself for a moment is putting back lost pressure. A slow drip in the lines or a worn pressure switch can cause it. Our RV water pump repair starts by tracing that pressure loss to its source.

A pump that runs but moves no water may have a clogged strainer or an air leak at the intake. One that will not start can trace to a blown fuse or loose wiring, a job for RV electrical repair. When the pump itself is worn out, we replace it.

RV plumbing repair after a Hill Country freeze

Winters around San Marcos are mild, but freezes still come. NOAA climate normals for San Marcos count about 20 nights a year at 32 degrees or colder. In a typical year, the first freeze comes by the end of November.

Water heater and pump makers both warn that their units are damaged if water freezes inside. Lines and fittings can split the same way. A split can stay hidden until the thaw, when the water goes back on.

After a freeze, we track down the split lines and fittings and replace them. We also check the water heater and the pump before the system is refilled. The makers' manuals say to drain the water heater when freezing weather is coming.

Water lines and fittings behind an RV water heater, RV plumbing and water heater repair Water heater swap at a motorhome parked on a street, RV plumbing and water heater repair

Ready to get started?

Call or text for a written quote. We work about 50 miles around San Marcos across the Hill Country and the I-35 corridor.

(512) 850-7257
How We Work

How a Job With River Cities RV Service Runs

From the first call or text to the finished work, here is how it goes.

1

Call or Text

Call or text (512) 850-7257. Tell us what the RV is doing and where it is parked.

2

The Service Call

We come to the RV and find the cause of the problem. The service call covers the diagnosis and the trip. If you bring the RV to our shop, the diagnosis happens there.

3

The Written Quote

After the diagnosis, we put the quote for the repair in writing. The repair goes on the schedule once you say yes.

4

Parts When Needed

When the repair needs parts, we order them. Once the parts arrive, we set a time to make the repair.

5

The Repair

We make the repair where the RV sits, or at our shop if you brought it in. On RV warranty and insurance repairs, the work starts once the claim is approved.

FAQ

RV Plumbing and Water Heaters Questions, Answered

Common questions about rv plumbing and water heaters around San Marcos and the Hill Country. If yours is not here, call or text and ask.

Call (512) 850-7257

Can you fix my RV water heater where it is parked?
Yes. We do RV water heater repair where the RV sits, within about 50 miles of San Marcos. That covers RV parks, campgrounds, storage lots and driveways. If you would rather drop it off, bring the RV to our San Marcos shop.
Is it normal for my RV water heater's relief valve to drip?
Some dripping can be normal, according to water heater makers. Heated water expands in an RV's closed system, and the relief valve lets off the extra pressure. An air pocket at the top of the tank cuts down the dripping. A steady stream, or a leak from the tank itself, needs a repair.
Why does the hot water in my RV smell like rotten eggs?
Water heater makers trace that smell to sulfur in some water supplies, set off by bacteria or a chemical reaction. Their fix is to sanitize the water system, then flush it with fresh water. If the smell returns, the makers of tanks with an anode rod call for a new rod. We replace anode rods as part of RV water heater repair.
Can you install a tankless water heater in my RV?
Yes. A tankless water heater is one of the new plumbing components we install. It heats water as the water flows through, so there is no tank to fill. We look at your RV first and put the quote for the install in writing.
How much does RV plumbing repair cost?
It depends on the part that failed and how much of the RV has to come apart to reach it. A loose fitting and a new water heater are very different jobs. The service call covers the diagnosis and the trip to your site. Then we put the repair quote in writing.
Do you work on the RV park's water and sewer hookups?
No. At an RV park, the site's water spigot and sewer inlet belong to the park. We work on the RV itself: its lines, its tank valves, its pump and its water heater. House plumbing and septic systems belong to a plumber or a septic company.
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Why Choose River Cities RV Service

Mobile RV Repair Around San Marcos

We Come to the RV

The service call comes to the RV, within about 50 miles of San Marcos. That covers the I-35 corridor and the Texas Hill Country around it.

A Shop in San Marcos

If you would rather bring the RV to us, our shop is in San Marcos. Call or text first to set a time.

The Quote in Writing

The service call covers the diagnosis and the trip. Then the repair quote comes to you in writing.

Google Reviews

Rated 5.0 on Google Around San Marcos and the Hill Country

Real reviews of our RV repair work, 34 reviews on Google.

Read All Reviews

Josh replaced the a/c and heater control board in my travel trailer he did an awesome job I highly recommend him

Dustin Wied8 months ago · Google review

We discovered just 4 days before our Thanksgiving trip that our RV slide-out wasn’t working. We contacted Josh, and he came out the very same day to diagnose the issue. He quickly ordered the necessary parts and managed to get everything repaired in time for our trip. Josh was professional, efficient, and highly communicative throughout the entire process, keeping us informed every step of the way. His pricing is very reasonable, and we truly appreciate the extra effort he put in to ensure we were able to leave on time. Highly recommend his RV repair services!

Kelly Erba year ago · Google review

Josh and his team are amazing. He replaced my roof on my wildcat 5th wheel. And once it rained he returned twice to assess any leaks and concerns. He’s my repair guy now! Thank you Josh!!!!

Guides and Resources

RV Plumbing and Water Heaters Guides

Request a Quote

Get In Touch With River Cities RV Service

Tell us what the RV is doing and where it sits. Call or text (512) 850-7257 or use the form, and we will get back to you.

Request a Quote

Tell us about your RV, what is wrong and where it is parked. We diagnose the problem and put the repair quote in writing.

Call (512) 850-7257