Business Details
27 Years
experience
Emergency
services
Your Trusted Partner for Plumbing Solutions in Irvine, CA
At House has been delivering high-quality water heating and purification solutions since 1999. Our team combines Japanese engineering precision with local expertise to provide energy-efficient, reliable systems tailored to Southern California homes. With over 10,000 successful installations, we specialize in tankless water heaters, purification systems, and 24/7 emergency repairs. Our certified technicians prioritize transparent pricing, same-day consultations, and personalized service to ensure long-term customer satisfaction.We maintain partnerships with leading manufacturers to offer premium products with comprehensive warranties. Our commitment to quality is demonstrated through annual maintenance checks, free in-home consultations, and a 25-year track record of exceeding customer expectations. We serve Orange County residents with fast response times and guaranteed workmanship, supported by 5-star Yelp reviews and industry certifications.
Services
Tankless Water Heaters
Water Purification
Heat Pump Installation
System Repair
Maintenance Services
Details
- Year established: 1999
Highlights and features
- Certified technicians with 25+ years of specialized experience
- Same-day consultations and emergency repair availability
- Transparent pricing with no hidden fees
- Manufacturer-backed warranties on all installations
- 5-star Yelp reviews from 123+ satisfied customers
What people say
Professional installation
Same-day service
Transparent pricing
Rebate assistance
Certified technicians
Services
Tankless Water Heaters
Our tankless water heaters provide continuous hot water while reducing energy consumption by up to 20%. Designed for residential properties, these systems eliminate cold showers and bulky tanks. Professional installation ensures optimal performance with same-day service available for urgent needs.
Water Purification
Advanced purification systems remove contaminants and improve water taste throughout your home. We install whole-house filtration and under-sink reverse osmosis units. Certified technicians ensure proper installation for clean, safe drinking water from every tap.
Heat Pump Installation
Professional heat pump installation with available rebates up to $2000. Our technicians handle residential hybrid water heating systems for improved efficiency. We coordinate utility company requirements to maximize customer savings on new installations.
System Repair
24/7 repair service for water heaters and purification systems. Factory-trained technicians diagnose and fix issues with all brands. We maintain same-day response times for urgent hot water failures and system malfunctions.
Maintenance Services
Annual maintenance checks included with all installations. Our service plans extend system lifespan and maintain efficiency. Technicians perform comprehensive inspections of heating elements, filters, and safety components during scheduled visits.
People
Hiro Takanashi
President
With 25+ years in water technology, Hiro leads At House's strategic direction. He ensures technical excellence and customer satisfaction across all operations. His expertise in Japanese engineering principles shapes the company's service standards.
Makito Shito
Lead Service Tech
Senior technician with specialized training in hybrid water heating systems. Handles complex installations and trains junior staff on manufacturer specifications. Provides on-site technical support for residential projects.
Zaire Chavis
Lead Service Tech
Certified water purification specialist with expertise in reverse osmosis systems. Manages filter replacements and system upgrades. Offers technical consultations for residential water quality improvement.
Anthony Frias
Master Service Tech
Master plumber with advanced certification in tankless heater diagnostics. Specializes in emergency repairs and system troubleshooting. Maintains factory certifications for major brand installations.
Alex Frias
Master Service Tech
Senior technician specializing in whole-house water systems. Coordinates multi-unit installations and complex plumbing retrofits. Provides technical oversight for large-scale residential projects.
Questions
What water heater brands do you install?
We install Rinnai, Navien, and A. O. Smith systems. Our technicians are factory-certified for these brands.
Do you service areas outside Orange County?
We primarily serve Orange County. Contact us for specific locations in surrounding regions.
Are financing options available?
We offer payment plans through select utility company programs for qualifying installations.
What's included in annual maintenance?
Our maintenance includes system diagnostics, component inspection, and performance optimization at no extra cost.
How quickly can you respond to emergencies?
Our 24/7 service guarantees same-day response for urgent water heater failures.
Do you offer water quality testing?
Yes, we provide free water analysis to determine appropriate purification system requirements.
Reviews (6)
Fredrik N.
Dec 09, 2021
Report
Hiro the owner has built a solid plumbing team! he sent out 2 of his guys to connect our hot water return that btw was inside of our navian tankless all this time! (old plumbers did not connect properly) i took a chance with this company and so glad i did!
Ryo T.
Oct 01, 2021
Report
I really like their work for remodeling my bathroom!
It's beautifully done. They answered all my questions and concerns, and also gave me great advice about the materials etc. Highly recommended.
It's beautifully done. They answered all my questions and concerns, and also gave me great advice about the materials etc. Highly recommended.
Giang N.
Sep 24, 2021
Report
Our water heater broke down in the middle of the winter two years ago and we decided to upgrade it to a tankless heater. We did a bit of research and understood the price range, but the few places that we called (that were closer to our house) gave us outrageous prices (double to triple the price range!). We came across At House and they quoted us exactly within the range that we expected. They also clearly explained the process and the tax rebate we would get from switching to tankless. Needless to say, we were happy. The work got done in no time and we were back to showering in our home instead
Annie G.
Aug 27, 2021
Report
Best Plumbing company around Orange County. Reliable, professional and extremely knowledgeable. I am super pleased and will only work with them from now on. Thank you,
Anica
Anica
Bessy W.
Aug 11, 2021
Report
We had been getting an error 10 on our Rinnai water heater for a couple of months. Water turned cold during showers. Called various reps for repair but no avail. Very disappointing. Thought about throwing away the unit. By chance, my husband found At House and called Hiro. Hiro was very responsive and knowledgeable. They scheduled us really fast without a long wait. Kevin and another guy came out (apology for not remembering his name). We could tell the guys were experienced and familiar with the unit and the error message. It took them a few hours to thoroughly diagnose and fix the
Ryan L.
Aug 03, 2021
Report
I hired At House to install a Rennai control*r WiFi module to enable scheduled recirculation on our water heater. In doing so, it was discovered that the heater was returning an error code. After lots of very thorough debugging, the problem ultimately turned out to be a faulty recirculation pump which had to be replaced. At House contacted Rennai to file a warranty claim, get the replacement ordered, and promptly scheduled a followup appointment as soon as the part arrived. Their communication throughout the job was excellent and, should the need arise, I would hire them again without hesitation
