Ontario Plumbing, Heating & Air Conditioning Experts
Full Plumber Services In & Around Ontario
Ontario is one of the oldest communities in the Inland Empire. So much of Ontario has unique, historical homes and buildings. A special city needs a special plumber that can service, replace and help you maintain all the plumbing in your home – old or new. At Klaus & Sons, a trusted name in the industry, we’re proud to bring our expertise from Montclair, CA, to serve the thriving community of Ontario. With years of experience, we are committed to providing exceptional heating, cooling, and plumbing solutions to residents and businesses in Ontario.
Give us a call 909-982-5698 or fill out our contact form for immediate assistance.
Emergency Plumbing:
For those unexpected plumbing emergencies, Klaus & Sons is here to provide prompt and reliable emergency plumbing services. We understand that issues can arise at any time, and our experienced team is ready to assist you 24/7.
Air Conditioning Installation and Repair:
When the summer heat sets in, having a reliable air conditioning system is essential. Our team specializes in the installation and repair of energy-efficient AC units, ensuring you stay cool and comfortable when the temperatures rise. We’re here to make your home a haven from the summer sun.
Heating Installation and Repair:
Stay warm and cozy during the colder months with our expert heating installation and repair services. Whether you need a new heating system installed or require prompt repairs to your existing one, Klaus & Sons has you covered. Our skilled technicians ensure your home remains comfortable year-round.
Residential Plumbing Services:
From routine maintenance to complex plumbing issues, Klaus & Sons is your trusted partner for all your residential plumbing needs. Leaky faucets, clogged drains, and more – we’ve got the solutions to keep your water systems flowing smoothly.
Water Heater Repair & Replacement:
Our expert technicians are skilled in water heater repair and replacement services. We ensure your hot water needs are met, providing you with reliable access to hot water whenever you need it.
Why Choose Klaus & Sons:
- Experienced Team: Our skilled technicians are highly trained and experienced in the HVAC and plumbing fields. You can trust us to provide efficient and reliable services.
- Customer-Centric Approach: We value your satisfaction and work closely with you to meet your specific needs and budget.
- Quality Products: We use top-quality products and materials, ensuring the longevity and effectiveness of our installations and repairs.
- Emergency Services: We understand that heating, cooling, and plumbing issues can arise at any time. Our emergency services are available 24/7 to address urgent problems promptly.
Contact Us:
When you choose Klaus & Sons, you’re choosing excellence in HVAC and plumbing services. We’re dedicated to ensuring the comfort and functionality of your Ontario, CA property. For reliable, professional, and friendly service, contact us today at 909-982-5698 to schedule an appointment or request a quote. Klaus & Sons is here to make your life more comfortable, one service at a time.
Call 909-982-5698 the professional HVAC technicians at Klaus & Sons Plumbing Heating & Air Conditioning in Ontario, CA today for air conditioning service or a free estimate!
Recent Jobs and Reviews in Ontario, CA
Customers say: The reviews exhibit a positive sentiment overall, with a slight inclination towards the positive. The recurring themes include praise for the company's responsiveness, professionalism, and quality of service. Customers express gratitude for the prompt attention, efficient repairs, and friendly technicians. The company's reputation for reliability and excellent customer service is consistently highlighted. However, there are a few negative reviews that mention pricing concerns, although they are less frequent. Overall, the reviews suggest that Klaus & Sons Plumbing & Heating provides reliable and satisfactory plumbing services, with a focus on customer satisfaction and quality workmanship.
Our Local Reviews by City
- Chino, CA (5)
- Chino Hills, CA (2)
- Claremont, CA (18)
- Covina, CA (1)
- Diamond Bar, CA (1)
- Fontana, CA (1)
- Glendora, CA (1)
- La Verne, CA (1)
- Monrovia, CA (1)
- Montclair, CA (1)
- Ontario, CA (8)
- Pomona, CA (6)
- Rancho Cucamonga, CA (18)
- San Dimas, CA (2)
- Upland, CA (25)
Job Locations and Reviews

10 - 12. Spoke to Rochelle. Needs a whole house water detection shut off system installed. Please provide quote first. Rochelle is in Florida, but she is asking her neighbor to come by in case you need to get in house. Said she will call if anything changes. Please call Rochelle when there for approval! - (909) 227-7209. She also needs a report once job is done, just an invoice stating that a licensed plumber put the water detection shut off in since it's a law in California now.

8 - 10. Spoke to Sergio. A plug came out in backyard, backed up, 4-inch cleanout, needs a snake

10 - 12. Spoke to Art. Commercial building has leaking pipe coming off of water heater. A small leak however needs someone to come out to fix. Please quote for repair before performing any work!!! Also, Call Art if you can't get in through front door, he will let you in - (909) 498-6944. CC on file, says they usually pay with CC Amex on file.

10 - 12. Spoke to Emily. She is main POC. In charge of maintenance and manager of both offices. The heater for this office worked in the past but hasn't worked for a while now, please check out. Quoted $179 for commercial diagnostic. Thomas is accountant. Will call to get CC on file, however, they would like you to email the invoice to the email on file and Thomas will pay through that link.

Glen is accepting sewer line estimate, so James is doing clear out for no charge.


(2-4) David changed her thermostat batteries yesterday and charged the diagnostic fee already. Please see copy invoice attached to this job. She said that her heater is still not working at this time!

1/29/25 Kirk’s wife was there. Kirk was much easier to deal with last time. She wanted parts warranted with no labor cost. I told her there will be a labor charge. She cancelled at the door. She prefers to call the builder for warranty. I explained that anyone is gonna charge labor. She declined. She is not nice. She acted as if we installed it and owed her a furnace. Do not send me back please and thank you.

Cheryl Koch on hold pending install. Gave info to Dan.

(1-5) COD. Spoke with Jackie. She says that her thermostat is completely blank, so she is unable to work her heater. She would like an estimate to get this fixed. She is aware of the $158 diagnostic fee.

Joe called to get back on the schedule, the rats were dealt with and now he will have clear access to the rubber gaskets.
Very knowledgeable and professional service

(12-2) Net 30. Spoke with Duke. Please call him when you are on site (909) 957-8688! He is currently evicting a tenant at this commercial property, unit F. He would like to get the plumbing fixtures removed and hauled away: makeshift hose bibb/shower, toilet and sink. He would also like to have any exposed pipes/ lines capped off. Please get approval on pricing BEFORE performing the work!


8-10. COD. Text (909) 261-7612. I spoke to Kathleen, they dropped a dryer brush in their bathroom sink trying to clean it and can't pull it out.

12 - 2. Spoke to Glen. They have a leak, not sure where it's coming from, but they can hear the water. They have shut off the water for now. He said the house is old and has galvanized piping and that it will cause problems soon, so he is looking for an estimate on re-piping the whole house as well.

Per Sal open up new ticket for more work.

Printed information and gave to Dan. Pending install.
The technician was very helpful and addressed the issue quickly.


12 - 2. SEE JESSE FIRST. Per Doreen: "Hello, We are currently selling our house and received some comments regarding our water heater during the house inspection. Section 10.6.2 Calls out for a airtight collar between flues to deter combustion gases. Can you please advise us on how to do this. We are not sure what is needed." Attached report below VVVV


Juan accepted the estimate and placed a card on file for payment after completion of work. He is aware of and okay with the 3% credit card fee. Jake estimates that the job will take 3 hours to complete.
Great communication, they were able to replace my water heater same day!
Thank you so much for taking the time to leave an excellent rating. We really appreciate your business.

Facing water heater issues after 1:30pm? Angela's husband attempted to re-light the pilot without success. Our expert technicians are here to provide efficient solutions from 1:30 - 3:30pm. Contact us for immediate service.


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Contact Juan at (626) 437-1777 for faster plumbing services. He needs an estimate for a new shut off valve covered by insurance. Quality service guaranteed for your convenience. Call now for more information!


In need of a new water heater? Contact us to solve your water heater troubles! Angel's corroded and leaking water heater was shut off by the gas company. With over 12 years old, it's time for a replacement. Unsure of the gallons needed, but with 2 1/2 baths, trust us to provide the right service for your home.

Contact Cheryl at (909) 214-4948 for a camera inspection approval for $289 with 12-2. Net 30 terms. Solve clogging issues in unit B efficiently. Get further work approval after the inspection. efficient and affordable solution.


Need help with a slow draining toilet? Look no further! Our expert team spoke to Carolyn about her toilet issue, and we're here to help you too. Let us unclog and fix your toilet quickly and efficiently. Contact us for fast and reliable service!


Looking for expert plumbing services? Per Amen provides top-notch sink installation for customers. Trust us to professionally install your sink with precision and care. Reach out for a quote today!
Service was excellent but the pricing is outrageous. I provided the faucet, Jake was here for approximately 2 hours and the bill was $739.74. That is over $350.00 an hour. Can you please doublecheck the bill and verify that that $739.74 is correct.
James did a nice job on a long overdue new Moen kitchen faucet installation. A ceramic disc cartridge is the way to go with today's modern faucets especially if you have hard water. They're easy to install, but my arthritic body said let Klaus & Sons do it. They stock and install new water heaters, but for faucets or utility sinks you must purchase elsewhere and they'll install it for you.
Couldn’t ask for better service!!
Klaus and Sons gives over and beyond the service that is needed The technicians involved are always informative and very productive You can't go wrong with Klaus & Sons
David was prompt, knowledgeable, and fixed our AC quickly. Very professional and friendly.