Tankless Water Heater Replacement in Castle Hills, TX
When a tankless water heater stops providing hot water, diagnosis comes first, because the answer may be a repair or a replacement. Will’s Plumbing & Testing Service diagnoses, repairs, and replaces tankless water heaters for homes in Castle Hills and across North San Antonio.
Availability depends on technician scheduling, service location, access conditions, and current call volume. Call us to confirm availability for your address.
Serving San Antonio since 1999. Led by William Shilling, whose plumbing career began in 1988 and who has been a licensed Master Plumber since 1993.
A Recent Tankless Replacement in Castle Hills
What the homeowner reported: the water heater was not providing hot water.
What our plumber found: diagnostics on the tankless water heater identified an issue with the heat exchanger.
What we did: we installed a new Rinnai RXP199 tankless water heater.
Result: we turned on the gas and checked for leaks, then turned on the water and checked for leaks. The job was completed in June 2026.
The Heat Exchanger and Repair or Replace
The heat exchanger is the part of a tankless water heater that transfers heat to the water as it passes through. On this job, diagnostics pointed to the heat exchanger, and the unit was replaced with a new Rinnai RXP199 tankless water heater.
Whether a tankless problem is repaired or the unit is replaced depends on the diagnosis, the unit, and the parts involved. See our guide on repairing or replacing a water heater and tankless water heater service.
Checking Gas and Water Connections
A tankless installation connects to both the gas supply and the water lines. After the new unit was in place, the gas was turned on and checked for leaks, and then the water was turned on and checked for leaks.
See our gas line services and our guide to tank and tankless water heaters.
More Plumbing in Castle Hills
See our Castle Hills plumbing page for the other services we provide in the area, and our Rinnai tankless water heater service page.
Tankless Water Heater Replacement in Castle Hills: FAQs
Do you replace tankless water heaters in Castle Hills?
Yes. Castle Hills is within our regular service area, and we diagnose, repair, and replace tankless water heaters there. We start by finding out why the unit is not working, then explain whether a repair or a replacement makes more sense. Availability depends on technician scheduling, location, access, and current call volume, so please call to confirm for your address.
What does the heat exchanger do in a tankless water heater?
The heat exchanger is where a tankless water heater transfers heat to the water as it flows through the unit. If it is not working as it should, the unit may not provide hot water. A diagnosis confirms whether the heat exchanger is the problem before any part or unit is replaced.
Should I repair or replace my tankless water heater?
It depends on what the diagnosis finds, the age and condition of the unit, and the parts involved. Some problems can be repaired, while others make replacement the more practical choice. We diagnose the problem first and explain the options and their costs before any work begins.
Do you install Rinnai tankless water heaters?
Yes. The job above was a new Rinnai RXP199 tankless installation. After installing a tankless unit, we turn on the gas and water and check the connections for leaks. See our Rinnai tankless water heater service page for more about the Rinnai work we do.
Are you licensed?
Yes. Work is performed by or under the supervision of a Responsible Master Plumber licensed by the Texas State Board of Plumbing Examiners (TSBPE).
No Hot Water From Your Tankless in Castle Hills?
If your tankless water heater is not providing hot water, call Will’s Plumbing & Testing Service. We will diagnose the problem and explain your options.