Tankless Water Heater Repair

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No Hot Water? No Problem. Call the Water Heater Professionals at CastleWorks Today!

Tankless Water Heater Repair in California

Expert Diagnosis & Fast Fixes from CastleWorks Water Heaters

Tankless water heaters are efficient and compact—but like any system, they need repairs from time to time. At CastleWorks, we specialize in diagnosing and fixing issues fast so you’re not left without hot water. If your system is underperforming or acting strangely, don’t wait. Catching the problem early can save you from a costly tankless water heater replacement.

Signs Your Tankless Water Heater Needs Repair

Here are a few common warning signs to watch for:

  • Inconsistent Water Temperature – Water that runs too hot, too cold, or fluctuates in between could point to a failing thermostat, internal sensor issues, or sediment buildup. Our team can pinpoint the issue quickly.
  • Leaks Around the Unit – Visible moisture or water pooling near the unit might indicate a loose valve or cracked pipe. The sooner it’s addressed, the better your chances of avoiding structural damage—or needing a full replacement.
  • Limescale or Mineral Buildup – Notice white, chalky residue on your fixtures? That’s often calcium scaling caused by high water temperatures, especially in hard water areas. Descaling your tankless water heater helps restore efficiency.
  • Foul-Smelling Hot Water – If your hot water has a rotten egg smell, bacteria could be growing in the system—commonly due to a corroded anode rod or stagnant water. We’ll flush the unit, inspect key components, and recommend the right solution.

Why Choose CastleWorks for Tankless Water Heater Repairs?

We combine deep technical expertise with a customer-first mindset to make your tankless water heater repair as efficient and stress-free as possible. Here’s what sets us apart:

  • Tankless Expertise: We work with both gas and electric models from all major brands.
  • Honest Estimates: You’ll always get a straightforward quote—no surprises.
  • Fully Stocked Vans: Most repairs are completed the same day.
  • Customer-First Approach: You get recommendations based on your needs—not sales goals.

Need regular upkeep? Water heater maintenance can help you avoid breakdowns and keep things running efficiently year-round.

Schedule Your Tankless Water Heater Repair Today

Hot water problems don’t fix themselves—trust the specialists at CastleWorks for fast, honest service. With transparent pricing, same-day service in many cases, and courteous technicians who put your comfort first—you’re in great hands. Call now or fill out the contact form below to restore your home’s comfort and convenience.

ExcellentGoogle star 1Google star 2Google star 3Google star 4Google star 5.0.74.71734 reviews
4.7Google star 1Google star 2Google star 3Google star 4Google star 5.0.7
Excellent1734 reviews
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alice engelmann profile picture
alice engelmann
22 September 2026
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Excellent technician, clean, professional and focused. He provided customer education when all was done and answered all pre- work questions as well. Represented your company well. In
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Bill Loper profile picture
Bill Loper
20 September 2026
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I would rate my experience with Christopher Beauvoir's installation of a new water heater as a "5". He was extremely professional and straight-forward about the entire process. Explained teh issues with my old water heater, and installed the new one quickly and efficiently. I would not hesitate to recommend Castle Works to my associates if and when they need that kind of service. thanks again for solving my hot water issues!
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Todd Cetti
17 September 2026
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CastleWorks does excellent work. Christopher Beauvoir showed up on time, was very knowledgeable, and did an excellent job replacing our old water heater in the garage. They use Bradford White water heaters which are really good. Very happy with the job, thank you!
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Timothy Fives
13 September 2026
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CastleWorks’ technician, Christopher Beauvoir, showed up on time and quickly diagnosed the problem with the Grundfos circulation pump on our tankless water heater. He also discovered several faulty valves that had deteriorated over the years. Christopher replaced the failing pump and valves and was on his way in short order.
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Ferdinand Galvez
10 September 2026
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Chris was very professional and kind. Hes very educated when it comes to his like of work! You should definitely do business with Chris Beauvoir!! 5/5 Stars easy!!
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Girard Miller
9 September 2026
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We needed to replace our large 100 gal water heater (4.5 Ba house) and called Castleeworks when some slight leakage was visible in the drain pan. Great same-day service by Salvador Vidales, who provided the price estimate, consulted with us on options, and got us an additional discount because we were replacing with the exact same brand that they usually install, so no new major piping was rquired other than the usual new connectors. Waived the delivery fee for the new unit which was in Pomona several hours away on high traffic congestion day.. Salvador was also the installer, very capable and workmanlike. Had the whole worksite set up and old unit ready for removal when the delivery/installation guys arrived on the hottest day of the year. When the new alumuinum drain pan got dented in the installation on our raised pad which didn't look good, he pro-actively had the team pull the new unit back off and installed another replacement drain pan to make sure we were happy with the results. After the delivery guys left when the unit was in place, he worked for several more hours finishing at 7 pm. Showed good workmanship, gave us good advice. We were very happy with Salvador and the company so far at this point. Obviously the proof of the pudding will be in the new unit and our service contracts and warranties, but we're off to a very good start and would highly recommend based on this experience on Day One!
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Koosha Mortazavi
5 September 2026
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Justin was great very professional and explained in details. Their service is great but the company is pricey.
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Terri Mason profile picture
Terri Mason
29 August 2026
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I am more than satisfied with the service I received from Castleworks Home Services. From taking my phone call after hours when I discovered that my water heater was broken and leaking, and scheduling an appointment for the very next day… to keeping me updated on the estimated arrival time of my technician including a text with his full name and photo ID was truly impressive. But what was even more impressive is the actual service itself. Justin, the technician, was extremely easy to work with. He was knowledgeable, polite, explained everything, answered all of my questions, and completed all of the work in one visit. I couldn’t ask for a better experience and highly recommend this company! 5 ⭐️⭐️⭐️⭐️⭐️
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ginni ashen
21 August 2026
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On time and very knowledgeable.
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Peter Rosen profile picture
Peter Rosen
21 August 2026
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Justin is the best ever …. Thank you for sending him and for your instantaneous responses …. A+++ company

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The CastleWorks story began in 1995 and grew from the collaboration of many dedicated local professionals committed to service. Our family of businesses includes:

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