18 Best Gas Boiler Engineers in Belfast for 2026

🔥 18 businesses · 📍 Belfast
✓ Verified Google reviews · ✓ Reviewed regularly · ✓ Updated 5 May 2026
Mark Reid
Written by Mark Reid, Home Services Editor · Verified 5 May 2026
Belfast's mix of Victorian terraces, post-war housing estates, and modern developments creates unique heating challenges. Many homes in areas like the Ormeau Road still rely on older cast iron radiator systems, whilst newer builds in Titanic Quarter typically feature modern combi boilers. The city's hard water can cause limescale buildup in boilers, and the damp climate means heating systems work harder for longer periods each year.

Every business featured here has been selected based on verified Google reviews, active Gas Safe registration, and proven trading history in Belfast. We've checked their credentials through the Gas Safe Register, examined customer feedback patterns over multiple months, and confirmed they maintain proper public liability insurance. Several specialise in particular boiler brands like Worcester Bosch or Vaillant, whilst others focus on emergency repairs or full system installations.

Before booking any engineer, ask to see their Gas Safe ID card and check the registration number online. Get written quotes that break down parts and labour costs separately. Most reputable engineers will offer free estimates for new installations, though emergency callouts typically cost £80-120 before any work begins. Don't accept quotes over the phone without a proper assessment, and always get at least two quotes for major work like full boiler replacements.
How We Select & Rate The Best Gas Boiler Engineers in Belfast

Our selection process analyses Google ratings and review patterns, verifying each business maintains active Gas Safe registration and proper insurance coverage. We check trading history through Companies House where applicable and monitor customer feedback trends. Inclusion on this page doesn't constitute our endorsement, and we recommend readers conduct their own checks, obtain multiple quotes, and verify credentials before hiring any tradesperson.

Quick Comparison — Gas Boiler Engineers in Belfast

# Business Rating Reviews Phone
1 Action Plumbing and Heating Recommended ⭐ 5.0 225 +44 28 9061 0944 View →
2 DG Gas Safety Ltd Featured ⭐ 5.0 219 +44 7925 099321 View →
3 solv Group Boiler Service & Repairs Featured ⭐ 4.8 314 +44 28 9045 1010 View →
4 Belfast Boiler Installations Featured ⭐ 4.9 234 +44 7899 080539 View →
5 Heating Solutions NI Featured ⭐ 4.8 200 +44 7704 435095 View →
6 Graham Wallace Plumbing and Heating Ltd ⭐ 5.0 132 +44 7878 548460 View →
7 N F Heating ⭐ 5.0 95 +44 28 9600 5051 View →
8 Belfast Gas | Boiler Service | Boiler Installation | Boiler Repair | Gas Boiler Engineer ⭐ 4.8 109 +44 800 054 1186 View →
9 B W Gas Services ⭐ 5.0 50 +44 7825 159300 View →
10 Gilnahirk Boiler services ⭐ 4.9 47 +44 7734 910712 View →
11 ODH Heating: Gas Engineer Belfast | Commercial & Domestic Heating ⭐ 4.8 48 +44 7730 325176 View →
12 Colin Stobo Gas Services ⭐ 5.0 18 +44 7809 143265 View →
13 Sloans Gas Energy Centre ⭐ 4.4 41 +44 28 9064 3049 View →
14 JD BOILER SERVICES ⭐ 5.0 10 +44 7927 646264 View →
15 Belfast Boiler Services ⭐ 5.0 9 +44 28 9560 1014 View →
16 Complete Gas Services ⭐ 4.7 15 +44 28 9228 0228 View →
17 AB Premier Boiler Services ⭐ 5.0 8 +44 7980 019228 View →
18 NI Boiler Service ⭐ 4.4 7 +44 7512 751371 View →

Our Top Picks

6
Graham Wallace Plumbing and Heating Ltd
5.0 (132 reviews)

Graham Wallace Plumbing and Heating Ltd provides gas boiler engineering services throughout Belfast, specialising in boiler installations, repairs, and maintenance. The company has earned a perfect 5-star rating from 132 verified customer reviews, reflecting their reliable workmanship and professional service. Their experienced engineers handle all aspects of gas boiler systems for residential and commercial properties across the Belfast area.

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7
N F Heating
5.0 (95 reviews)

N F Heating provides gas boiler engineering services throughout Belfast from their base in the BT6 area. The company has earned a 5-star rating from 95 verified customer reviews on Google. Their experienced engineers handle boiler installations, repairs, and maintenance for residential and commercial properties across the city.

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8
Belfast Gas | Boiler Service | Boiler Installation | Boiler Repair | Gas Boiler Engineer
4.8 (109 reviews)

Belfast Gas provides comprehensive boiler services including installation, repair, and maintenance throughout Belfast from their Wellington Park base. The company's gas boiler engineers serve residential and commercial customers across the BT9 area and surrounding neighbourhoods. With a strong reputation reflected in their 4.8/5 star rating from 109 verified customer reviews, they offer reliable heating solutions for properties throughout the city.

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9
B W Gas Services
5.0 (50 reviews)

B W Gas Services provides professional gas boiler engineering services throughout Belfast, operating from their base on Thornberry Road in the BT14 area. The company has earned a perfect 5-star rating from 50 verified Google reviews, reflecting their commitment to reliable boiler repairs, installations and maintenance. Their experienced engineers serve residential and commercial customers across the greater Belfast area with comprehensive gas heating solutions.

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10
Gilnahirk Boiler services
4.9 (47 reviews)

Gilnahirk Boiler Services provides professional gas boiler engineering services throughout Belfast from their base in the BT5 area. The company has earned a strong reputation with a 4.9 out of 5 star rating from 47 verified customer reviews. Their experienced engineers handle boiler installations, repairs, and maintenance for residential and commercial properties across the city.

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11
ODH Heating: Gas Engineer Belfast | Commercial & Domestic Heating
4.8 (48 reviews)

ODH Heating provides comprehensive gas engineering services for both commercial and domestic heating systems throughout Belfast. Based on Queen Street in the city centre, the company specialises in gas boiler installation, maintenance and repair work. With a 4.8/5 star rating from 48 verified customer reviews, ODH Heating serves residential and business clients across the Belfast area.

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12
Colin Stobo Gas Services
5.0 (18 reviews)

Colin Stobo Gas Services provides professional gas boiler engineering services to customers across Belfast from their base on Belvoir Drive. The company has earned a perfect 5-star rating from 18 verified customer reviews, reflecting their reliable approach to boiler installations, repairs and maintenance. Serving the BT8 area and surrounding Belfast neighbourhoods, they offer comprehensive gas heating solutions for residential and commercial properties.

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13
Sloans Gas Energy Centre
4.4 (41 reviews)

Sloans Gas Energy Centre provides gas boiler engineering services from their base on Ormeau Road in Belfast. The business maintains a strong 4.4-star rating from 41 verified customer reviews, reflecting their established reputation in the local heating industry. They serve the Belfast area from their BT7 location, offering professional boiler installation, maintenance and repair services.

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14
JD BOILER SERVICES
5.0 (10 reviews)

JD Boiler Services provides gas boiler engineering services throughout Belfast from their base in BT14. The company has earned a 5-star rating from 10 verified customer reviews, reflecting their reliable approach to boiler installations, repairs and maintenance. Their experienced engineers serve residential and commercial properties across the Belfast area.

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15
Belfast Boiler Services
5.0 (9 reviews)

Belfast Boiler Services provides professional gas boiler engineering services from their base on Upper Newtownards Road in Belfast. The company maintains a perfect 5-star rating across 9 verified customer reviews, reflecting their reliable approach to boiler installation, maintenance and repair work. They serve customers throughout the Belfast area, offering comprehensive heating solutions for residential and commercial properties.

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16
Complete Gas Services
4.7 (15 reviews)

Complete Gas Services provides gas boiler engineering services throughout Belfast, specialising in boiler installations, repairs, and maintenance for residential and commercial properties. The company has earned a 4.7 out of 5 star rating from 15 verified customer reviews on Google. Their qualified engineers handle all aspects of gas boiler work, ensuring reliable heating solutions for homes and businesses across the Belfast area.

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17
AB Premier Boiler Services
5.0 (8 reviews)

AB Premier Boiler Services provides gas boiler engineering services across Belfast, specialising in boiler installations, repairs, and maintenance. The company has earned a perfect 5/5 star rating from 8 verified customer reviews on Google. Their qualified engineers serve residential and commercial properties throughout the Belfast area.

Read more →
18
NI Boiler Service
4.4 (7 reviews)

NI Boiler Service provides gas boiler engineering services throughout Belfast from their base in Dalebrook Park. The company has earned a 4.4 out of 5 star rating from 7 verified customer reviews, reflecting their reliable approach to boiler maintenance and repair work. Their experienced engineers serve residential and commercial customers across the Belfast area, offering professional solutions for heating system requirements.

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Transparency notice: Recommended (#1) and Featured (positions 2–5) listings are paid placements. All other rankings are determined by a combined score drawn from Google ratings, review counts, and reputation signals gathered from multiple independent online sources. How we verify →

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Frequently Asked Questions

How much does a gas boiler engineers cost in Belfast?
Emergency callouts typically cost £80-120, with standard repairs ranging from £150-400 depending on parts needed. New combi boiler installations usually run £1,800-3,500 including the unit, whilst system boiler replacements can reach £4,000-5,500. Annual services cost £70-120. Prices vary based on boiler type, property access, and whether weekend or evening work is required. Always get two or three written quotes for major work.
How quickly can a gas boiler engineer come out in Belfast?
For emergencies like gas leaks or no heating in winter, most engineers aim to respond within 2-4 hours during normal hours. Standard repairs are usually scheduled within 1-3 days. New boiler installations typically need 1-2 weeks' notice, though this extends during peak periods like October and November. Some engineers offer 24/7 emergency services, but expect higher callout fees for nights and weekends.
What boiler brands do Belfast engineers typically work with?
Most gas engineers in Belfast work with major brands like Worcester Bosch, Vaillant, Baxi, and Ideal. Many specialise in one or two brands for installations but can service and repair most makes. Worcester Bosch is particularly popular in Belfast due to their local support network. Some engineers are brand-specific installers, which can affect warranty terms, so check this before booking installation work.
Do I need planning permission for a new boiler in Belfast?
Most boiler replacements don't need planning permission, but you might need Building Control notification if you're changing the flue position or moving the boiler to a different room. Listed buildings and conservation areas around Belfast city centre have stricter rules about external flue positions. Your engineer should handle Building Control notifications as part of their service, but confirm this when getting quotes.
What's the difference between combi and system boilers for Belfast homes?
Combi boilers suit smaller homes and flats as they don't need separate hot water cylinders or header tanks. They're common in Belfast's terraced houses. System boilers work better for larger homes with multiple bathrooms, like Victorian houses in South Belfast. The hard water in some Belfast areas can affect combis more than system boilers, so discuss your specific location with your engineer.
How do I verify a gas boiler engineer in Belfast is legitimate?
Check their Gas Safe registration number on the official Gas Safe Register website. Ask to see their Gas Safe ID card before any work starts. Verify they have public liability insurance of at least £2 million. Check their Google reviews for recent feedback and look for a proper business address, not just a mobile number. Avoid anyone who cold-calls or pressures you to decide immediately.