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TRUSTED BY CASTRO VALLEY, CA HOMEOWNERS

  • Average homeowner rating star icon4.5
    Average homeowner rating
  • Verified reviews icon1.6k+
    Verified boiler repairs reviews

Find Boiler repair pros in Castro Valley

Avatar for Water Heaters Masters

Water Heaters Masters

4.89(
105
)
Approved Pro

Water Heaters Masters

4.89(
105
)
Approved Pro
Customers say: Quality work
Recommended by 96% of Angi customers
Recommended by 96% of HomeAdvisor customers
63 local quotes requested

We are a small family owned business and our reputation is built one satisfied customer at a time. In a time where finding honest and well trained experts in the plumbing industry is difficult, we pride ourselves in serving you better. We know you have choices and will make every effort to demonstrate that we are the best option for your water heater, tankless water heater, and high efficiency water heater needs. We offer competitive pricing, the best products, and most important great customer service. We also want to do work for your friends and family, so the best endorsement for us is a job well done and a happy customer. We do standard water heater repairs and replacement but also bigger projects like relocation jobs and tankless water heater installations to name a few. Our technicians are highly experienced and have installed thousands of water heaters. Call or text us at 925-817-8342 for a free estimate. We serve residential or commercial customers, including apartments and condos.

"I have what turned out to be a 30 year old water heater replaced by this great company and they did it the same day of the quote. The installer had the water heater I wanted on the truck and did an excellent job of putting in the new unit, cleaning up and even replacing copper flex tubing and installing a new overflow pipe out of copper as well, no additional cost. This company specializes in water heaters and couldn't do any additional work on supply lines and they clearly state that on their website. I didn't need that type of additional work."

David C on September 2018

We are a small family owned business and our reputation is built one satisfied customer at a time. In a time where finding honest and well trained experts in the plumbing industry is difficult, we pride ourselves in serving you better. We know you have choices and will make every effort to demonstrate that we are the best option for your water heater, tankless water heater, and high efficiency water heater needs. We offer competitive pricing, the best products, and most important great customer service. We also want to do work for your friends and family, so the best endorsement for us is a job well done and a happy customer. We do standard water heater repairs and replacement but also bigger projects like relocation jobs and tankless water heater installations to name a few. Our technicians are highly experienced and have installed thousands of water heaters. Call or text us at 925-817-8342 for a free estimate. We serve residential or commercial customers, including apartments and condos.

"I have what turned out to be a 30 year old water heater replaced by this great company and they did it the same day of the quote. The installer had the water heater I wanted on the truck and did an excellent job of putting in the new unit, cleaning up and even replacing copper flex tubing and installing a new overflow pipe out of copper as well, no additional cost. This company specializes in water heaters and couldn't do any additional work on supply lines and they clearly state that on their website. I didn't need that type of additional work."

David C on September 2018


Avatar for Bell Brothers Plumbing Heating & Air

Bell Brothers Plumbing Heating & Air

4.66(
387
)
Approved Pro

Bell Brothers Plumbing Heating & Air

4.66(
387
)
Approved Pro
Customers say: Super punctual
Recommended by 90% of Angi customers
Recommended by 90% of HomeAdvisor customers
50 local quotes requested

We are locally owned and operated, and serving the Bay Area. Our focus is residential air conditioning, heating, Installation of HVAC systems and full-service plumbing. We love working with homeowners and helping to take care of their precious homes. We also keep busy doing light commercial service. Serving California since 1954, financing options available, We don't charge extra for Saturday service calls.

"Called this company for their $77 dollar, which they advertised with a flyer, for a tune-up and cleaning for my heating system. They are a Hayward company and I was told that our Castro Valley home was not in their service area. I bet if I called to buy a new heater they would be out in a day."

Gregory O on March 2023

We are locally owned and operated, and serving the Bay Area. Our focus is residential air conditioning, heating, Installation of HVAC systems and full-service plumbing. We love working with homeowners and helping to take care of their precious homes. We also keep busy doing light commercial service. Serving California since 1954, financing options available, We don't charge extra for Saturday service calls.

"Called this company for their $77 dollar, which they advertised with a flyer, for a tune-up and cleaning for my heating system. They are a Hayward company and I was told that our Castro Valley home was not in their service area. I bet if I called to buy a new heater they would be out in a day."

Gregory O on March 2023


Avatar for Albert Nahman Plumbing, Heating, and Cooling

Albert Nahman Plumbing, Heating, and Cooling

4.45(
686
)
Approved Pro

Albert Nahman Plumbing, Heating, and Cooling

4.45(
686
)
Approved Pro
Customers say: Super punctual
687 local quotes requested
44 years of experience

Albert Nahman Services was founded in 1981 and has been serving Berkeley, CA and it surrounding areas in all their plumbing and HVAC needs. Each of our technicians went through rigorous training so we can guarantee that you will be receiving the proper service. We are also insured and supply a warranty for our parts for five years and up to twenty years on an re-piping or sewer replacement. Call us now to make your appointment!

"The plumbing technicians came out as promised to assess the leak. They were both very courteous and kind and assessed the damage. I am giving three stars because they estimated the cost to be almost 250% higher than what the actual cost was to fix the issue. I am sure there are customers out there that would just accept any bid however, please get multiple beds for these projects, especially when working with this company as they will inflate the cost to take advantage of the situation. I ended up only paying for the $79 estimate."

Kevin C on September 2025

Albert Nahman Services was founded in 1981 and has been serving Berkeley, CA and it surrounding areas in all their plumbing and HVAC needs. Each of our technicians went through rigorous training so we can guarantee that you will be receiving the proper service. We are also insured and supply a warranty for our parts for five years and up to twenty years on an re-piping or sewer replacement. Call us now to make your appointment!

"The plumbing technicians came out as promised to assess the leak. They were both very courteous and kind and assessed the damage. I am giving three stars because they estimated the cost to be almost 250% higher than what the actual cost was to fix the issue. I am sure there are customers out there that would just accept any bid however, please get multiple beds for these projects, especially when working with this company as they will inflate the cost to take advantage of the situation. I ended up only paying for the $79 estimate."

Kevin C on September 2025


"Fernando was quick to replace the valve."

Andreas S on September 2025

We have 7 year experience on plumbing we are very clean and we use heavy duty materials. To get the best quality project.

"Fernando was quick to replace the valve."

Andreas S on September 2025


Avatar for Bay Water Plumbing

Bay Water Plumbing

5.00(
10
)
Approved Pro

Bay Water Plumbing

5.00(
10
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
6 years of experience

Bay Water Plumbing & Water Systems offers the best water treatment systems on the market. We are locally owned and we're the professionals that you can trust! We have been providing water system products to customers in the Bay Area for over 10 years. Our company installs the best quality water heaters on the market. Contact us to help you eliminate hard water from your home.

"Repairman was very professional and did a great job with the repair. I haven’t had issues with my water heater since."

Xavier G on February 2021

Bay Water Plumbing & Water Systems offers the best water treatment systems on the market. We are locally owned and we're the professionals that you can trust! We have been providing water system products to customers in the Bay Area for over 10 years. Our company installs the best quality water heaters on the market. Contact us to help you eliminate hard water from your home.

"Repairman was very professional and did a great job with the repair. I haven’t had issues with my water heater since."

Xavier G on February 2021


510 Plumbing - Unlicensed Contractor

5.00(
1
)
Approved Pro

510 Plumbing - Unlicensed Contractor

5.00(
1
)
Approved Pro
1 years of experience
Free onsite estimate

Here at 510 Plumbing, I pride myself on my professionalism, as well as my ability to complete every job to the homeowner's total satisfaction. I never leave a job unfinished, or a homeowner not 100% satisfied with my level of service. I handle plumbing repair work in Fremont and the surrounding areas - Call today!

"Had a leaking cartridge in my bathroom , was scared to mess with it , so I called 510 plumbers and they took care of it for me and replaced it !"

Andres O on February 2025

Here at 510 Plumbing, I pride myself on my professionalism, as well as my ability to complete every job to the homeowner's total satisfaction. I never leave a job unfinished, or a homeowner not 100% satisfied with my level of service. I handle plumbing repair work in Fremont and the surrounding areas - Call today!

"Had a leaking cartridge in my bathroom , was scared to mess with it , so I called 510 plumbers and they took care of it for me and replaced it !"

Andres O on February 2025


Avatar for FALCONI & SON'S CONSTRUCTION INC

FALCONI & SON'S CONSTRUCTION INC

5.00(
1
)
Approved Pro

FALCONI & SON'S CONSTRUCTION INC

5.00(
1
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
3 years of experience

FALCONI & SON'S CONSTRUCTION INC is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business. you can check my website: http://falconiconstruction.com

"Friendly, professional and 5 star job"

Daniel G on November 2024

FALCONI & SON'S CONSTRUCTION INC is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business. you can check my website: http://falconiconstruction.com

"Friendly, professional and 5 star job"

Daniel G on November 2024


"Mario and his crew are reliable, professional, reasonably priced and the work is always top notch with excellent communication and customer service! Iâ ve used them for several projects and I highly recommend them!"

Juliana D on September 2023

We’re a small family business located in the Bay Area, dad and sons, we service residential and comercial plumbing, drain cleaning and repairs.

"Mario and his crew are reliable, professional, reasonably priced and the work is always top notch with excellent communication and customer service! Iâ ve used them for several projects and I highly recommend them!"

Juliana D on September 2023


Avatar for BC Builds - Unlicensed Contractor

BC Builds - Unlicensed Contractor

4.75(
4
)
Approved Pro

BC Builds - Unlicensed Contractor

4.75(
4
)
Approved Pro
Customers say: Quality work
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
24 years of experience

Welcome to BC Builds! We take pride in the quality of work and customer satisfaction that we give each and every customer! We are known to pay exquisite attention to detail while making customer satisfaction our top priority. Call us today to learn more about how we can help you!

"Cameron is very nice and cleaned up after he did the job."

Margery D on March 2021

Welcome to BC Builds! We take pride in the quality of work and customer satisfaction that we give each and every customer! We are known to pay exquisite attention to detail while making customer satisfaction our top priority. Call us today to learn more about how we can help you!

"Cameron is very nice and cleaned up after he did the job."

Margery D on March 2021


Mendoza Plumbing Services - Unlicensed Contractor

New on AngiNew on Angi
Approved Pro

Mendoza Plumbing Services - Unlicensed Contractor

New on AngiNew on Angi
Approved Pro
5 years of experience
Free onsite estimate

I pride myself on my professionalism, as well as my ability to complete every job to the homeowner's total satisfaction. I never leave a job unfinished, or a homeowner not 100% satisfied with my level of service - Call today!

I pride myself on my professionalism, as well as my ability to complete every job to the homeowner's total satisfaction. I never leave a job unfinished, or a homeowner not 100% satisfied with my level of service - Call today!

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Boiler Repair questions, answered by experts

One of the most common signs you’re dealing with a bad thermocouple is the pilot light for the water heater will continuously go out. For example, you may light the pilot light and then have to re-light it a few days later. You can also look at the thermocouple for a visual inspection. If you notice discoloration, cracks, holes, or other damage, then you know it needs replacing.

Boilers are equipped with multiple safety features to ensure safe operation. These include pressure relief valves to prevent overpressure, temperature high-limit switches to avoid overheating, and flame failure safety devices in gas boilers to cut off the gas supply if the flame goes out unexpectedly. Low water cutoffs prevent operation with insufficient water levels, and pressure gauges help monitor pressure levels. Ventilation and flue systems prevent the buildup of harmful gasses. Boilers often feature error code systems for automatic shutdown during malfunctions and gas leak detection for safety. Regular maintenance is crucial to ensure these safety features function correctly.

When it comes to bleeding a radiator, the goal is to let out trapped air rather than letting out the water. Naturally, some water will dribble out when you open the valve to let out the air. But you don’t want a lot of water to leak out. Just leave the valve open long enough that the hissing noise stops, meaning the air has escaped, and just a dribble of water comes out of the radiator.

Both hydronic and electric hydronic heaters usually come with a higher price tag up front, but you can save more on energy costs over time compared to standard heaters. They also provide heat for a short time after the heater is actually turned off, making them more efficient. Additionally, standard convection heaters use electric coils to heat up the air, whereas hydronic heaters warm up water or oil which then heats the air.

There are many signs and symptoms to look out for that can indicate that your HVAC system needs repair, including the following:

  • Your indoor air is uncomfortably hot or cold.

  • Your energy bills suddenly increase without explanation.

  • Your AC is blowing warm air or not blowing air at all.

  • You notice leaks around your HVAC equipment.

  • Your equipment makes unusual noises during operation.

  • You notice strange odors coming from your equipment.

  • You notice that the humidity in your home is higher than normal.

  • The thermostat no longer seems to match the actual temperature.

The Castro Valley, CA homeowners’ guide to boiler repairs

From average costs to expert advice, get all the answers you need to get your job done.