Plumbing, Water Heaters, HVAC, Air Conditioning, Heating and More. Serving San Francisco Since 1995.

Plumbing Service in San Francisco When and Where You Need It Most.

Referred by many. Preferred by all. Call us today.

Referred by many.
Preferred by all.
Call us today.

Service man adjusting control knob

Water Heater Repair

Expert hot water install, repair, and maintenance services from local pros at CastleWorks.

Woman squeegeeing wet floor

Leak Detection

Water leaks can cause significant damage to your home and lead to costly repairs. Save water and money with our leak detection pros.

Man repairing outdoor HVAC system

HVAC Repair

Avoid costly surprises with our affordable, flat-rate pricing on all your heating and cooling needs.

100% satisfaction guaranteed logo


Service worker greeting family


Emergency Services

Emergency situations do not always wait until convenient hours. Our emergency service is available 24/7 so that you’re never in the dark. We have a team of professionals available to assist you 24/7, regardless of the emergency.

Water Heaters

Showers too cold? Unreliable hot water? No matter what the problem is with your water heater – from strange noises to leaks – our experts are here to help. It is important to choose the right water heating system for optimum performance and efficiency. Our maintenance services can extend the life of your heater and help prevent problems in the future.

Tankless Water Heaters

Enjoy endless hot waters with our tankless heating systems. Whether it’s a new install or repair, we can assist you. We can provide you with advice on the best units for your needs and budget.

Water Purification

Concerned with the water quality? We offer water purification solutions. We also install and repair water filter systems and water softeners.

Plumbing & Rooter

We offer a range of services from finding minor leaks all the way up to emergency situations. Installation, repair and even gas-line services are included in our service. We offer honest, transparent quotes and fair pricing so you don’t have to worry about breaking the bank.

Clogged Drains

Blockages can be a big problem and cause some serious headaches. Let us clear your drains and quickly prevent further issues. Our experts use the latest technologies to detect and resolve drain issues.

Indoor Air Quality

The indoor air you breathe directly affects both your health and your comfort. Services to improve the indoor air include repair and maintenance of air ducts, as well as sealing and cleaning. Also, we offer dehumidifiers and humidifiers to help maintain the right humidity level in your house.


We can help ensure your home is comfortable year-round. We offer installation, repairs, and maintenance for our cooling and heater services. If your AC unit isn’t cooling or your heater doesn’t work, our technicians will diagnose the problem and quickly fix it. We offer mini split installations and repairs, as well as smart thermostats. There are flexible options for financing services to ensure you can afford them.

Air Conditioning

Our heat pump and air-conditioning services can help you beat the heat in San Francisco this summer. CastleWorks has all the services you need for air conditioners or heat pumps. Your home will be comfortable and cool. We have a team that is highly experienced and familiar with the major brands. We optimize your HVAC system for San Francisco’s unique climate.


Our heating services ensure your comfort during San Francisco’s cooler nights. Furnaces, heat pumps, and boilers are all covered by our repair, installation, or maintenance services.

Commercial HVAC Repair and Install

We are familiar with the special needs of commercial properties. Our experienced team is ready to help you with any commercial HVAC needs, including installation or repairs. Our HVAC financing solutions can help your business manage costs.

Your Local Home Services Provider Since 1995

Castleworks team standing next to service vehicles

Our story begins in 1995 as Affordable Water Heaters (AWHAP) with inspired entrepreneurs including Lee and Christy Roux, Steve and Wendy Moore, Bill and Amy Tassio, David and Eliza Parker, and Danny and Kate Guiney. Each of these couples started from humble beginnings, building their family-owned and operated companies from the ground up in their various fields of expertise. Over many decades, their successful businesses provided expert plumbing, air conditioning, heating, and water heater services throughout California.

In 2020, Dubin Clark partnered with us for our next stage of growth and took on the name CastleWorks. We felt their expertise in specialty services would help guide and support our growth and expansion without compromising our reputation for high quality and excellent service.

CastleWorks has served as a leading, in-home service provider for same-day/emergency water heater replacements, gas and electric water heater repair and installation, tankless water heater installation as well as a variety of others water heater and plumbing services.

Hear What Others Are Saying About CastleWorks Home Services

CastleWorks Home Services
Based on 1096 reviews
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Dave d'ArtenayDave d'Artenay

01:25 08 Jan 23
He replaced a water heater and did a great job. He was very polite and cleaned up the area after completion. He was very accurate for the time needed to complete the job. He... explained everything before and after the job. Thanks!read more

Craig FalkenhagenCraig Falkenhagen

02:07 21 Oct 22
Gerardo arrived promptly, clearly explained the options we had for a new replacement water heater and then got to work on the installation. His courtesy and professional... demeanor were exemplary. We would gladly have him come back again. Thanks a million Gerardo! Perfect service and more

Jamie VargyasJamie Vargyas

18:30 24 Sep 22
Andras was courteous, efficient and very clean. He explained everything in detail and answered all my questions knowledgeably. Castle is top notch professional service. My... new go water heater comes with a 10 year warranty. Awesome work!!!read more

Chris ParraChris Parra

20:11 16 Sep 22
I would highly recommend this business. we had an emergency water heater leak, and they arrive to fix it very promptly within two hours. The technician, Julian Did a... fantastic job, explained everything that needed to be done, and did a great job. I highly recommend him and the more

Jerry ShawJerry Shaw

22:48 28 Aug 22
They replaced our water heater and installed some new venting and water piping. Also, new valves. Julian was great at what he did as well as being a very nice person. The... company was somewhat pricey though, as I was charged $4,287.00 for the new equipment and installation. Also, I wasn’t given an itemized receipt, although I was told I could call the company and ask for more


Our San Francisco & Bay Area Service Area

We proudly serve the great people San Francisco Bay area including Alameda, American Canyon, Bay Point, Benicia, Berkeley, Brentwood, Concord, Cupertino, Daly City, Dublin, East Palo Alto, El Cerrito, Emeryville, Foster City, Fremont, Hayward, Hercules, Lafayette, Livermore, Los Altos, Los Altos Hills, Martinez, Menlo Park, Mill Valley, Milpitas, Mountain View, Newark, Novato, Oakland, Oakley, Palo Alto, Petaluma, Pittsburg, Pleasanton, Redwood City, Richmond, San Bruno, San Carlos, San Jose, San Leandro, San Mateo, San Pablo, San Rafael, Santa Clara, Saratoga, Sausalito, San Francisco, Stanford, Sunnyvale, Union City, Vallejo, Walnut Creek.

San Francisco, Oakland & Bay Area Location:
3193 Diablo Ave
Hayward, CA 94545-2701