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Verified Reviews for Boiler Repair pros in Roundup, MT

*The Angi rating for Boiler Repair companies in Roundup, MT is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Boiler Repair needs.

*The HomeAdvisor rating for Boiler Repair companies in Roundup, MT is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Boiler Repair needs.

Last update on May 31, 2026

Find Boiler repair pros in Roundup

Avatar for Choice Home Warranty
Choice Home Warranty
4.0(
5,678
)

Serving Roundup, MT and surrounding areas

In business since 2008

Emergency services offered

Credit card accepted

"When you need help with a broken machine CHW is who you can trust to get the job done. And should they not be able to fix the machine they will replace it. I've been with them for many years. They've not failed me as of this writing and they won't"
Recommended by81%of homeowners
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Avatar for American Plumbing, Heating and Excavation, LLC
American Plumbing, Heating and Excavation, LLC
4.1(
25
)

Serving Roundup, MT and surrounding areas

In business since 2015

Free estimates

Warranties offered

"They replaced a conventional hot water heater with an on-demand heater and did a superb job. Great service to an area outside of Billings."
Garage heater
Response time12 hrs
Recommended by100%of homeowners
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Avatar for American Home Shield – Home Warranty
American Home Shield – Home Warranty
3.5(
5,688
)

Serving Roundup, MT and surrounding areas

In business since 1971

Credit card accepted

"They take money on muy account for my home warranty service, and they are very responsive, and very reliable. They send Repair companies to my house for repairs and services."
Additional Photos
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+2

Recommended by65%of homeowners
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Avatar for Mayes Mechanical, LLC
Mayes Mechanical, LLC
3.6(
7
)

Serving Roundup, MT and surrounding areas

In business since 2015

Free estimates

Emergency services offered

Mayes Mechanical, LLC is your premier choice for all of your HVAC needs in Billings and surrounding areas. We are a locally owned and operated full service company that has 20 years of experience in all aspects of HVAC and Mechanical field. No project is too big or too small, so call today and let us put our experience to work for you!

Greatroom
CK 5500 sq ft home
CK 5500 sq ft home
Response time1 day
Response rate98%
Recommended by71%of homeowners
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Avatar for Transform Home Improvements (formerly Sears)
Transform Home Improvements (formerly Sears)
2.4(
570
)

Serving Roundup, MT and surrounding areas

In business since 1992

Free estimates

Credit card accepted

"Adam, Sears service trechnician, was on time and completed the repair in 1 day...if you're in Sacramanto area looking for HVAC repairman, ask for Adam ONLY..."
Central AC Install
HVAC
HVAC
Best of HomeAdvisor
Recommended by54%of homeowners
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Avatar for Mountain Electric of Montana
Mountain Electric of Montana
5.0(
1
)

Serving Roundup, MT and surrounding areas

In business since 2007

Free estimates

Emergency services offered

We pride our company on reliability, great communication,\nintegrity, and quality work. We are experts in our trade and will do our best\nto keep you as educated as we can on your particular task or project. We look\nforward to earning your business!

Response time11 hrs
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Boiler Repair questions, answered by experts

If you have a closed-system boiler that requires an expansion tank, you cannot safely operate it without one, as this risks extensive damage or even explosions. You must find a way to make room for the installation. Options include repositioning the boiler, rerouting the boiler piping to a more open area, or performing minor remodeling to create the necessary space. If you are unsure whether your boiler needs an expansion tank or how to best accommodate one, it's recommended to have a local heating service professional assess the situation. They can confirm the requirement and suggest the most practical solution.

Most repairs take 2-6 hours, but extensive repairs or part replacements may require a full day or more, depending on availability.

Scale from hard water is hard to diagnose until it starts causing problems. If your area has particularly hard water, that’s most likely what your boiler is using. If scale build-up becomes a problem, it starts to cause decreased flow and heating, and eventually, valve failures as valves become blocked. Let boiler professionals know if you’re worried about scale and they can offer advice or implement a solution.

If your boiler is 20 years old, it’s time to get a new one. Although it may seem to be working fine, it’s likely eating up more fuel than it should. Also, compared to a brand-new boiler, one that’s 20 years old is probably not working as well. When you get your new unit, you’ll notice that your home is heating more quickly, and the heat is consistent throughout all the rooms.

The absence of heating or hot water, unusual noises like banging or gurgling, and visible water leakage are key signs. Abnormal boiler pressure, flame irregularities (for gas boilers), or pilot light issues may also signal trouble. Frequent cycling, soot or staining, and unusual odors, particularly gas-like smells, should not be ignored. Modern boilers often display error codes or lockout mode upon detecting issues. Uneven heating across radiators and rising energy bills without increased usage can further point to problems. Prompt attention to these signs is essential to prevent further damage and ensure safety.

The Roundup, MT homeowners’ guide to boiler repairs

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

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