21 Best Heating Engineers in St Albans for 2026

🔥 21 businesses · 📍 St Albans
✓ Reviewed regularly · ✓ Updated 22 October 2026
Mark Reid
Written by Mark Reid, Trades Editor · Verified 22 October 2026
St Albans has a mixed bag of housing, and that shapes the heating work you'll see locally. Victorian and Edwardian terraces around Fleetville, Clarence Park and the city centre often have older pipework, cramped airing cupboards and loft tanks that need rethinking when a combi goes in. Interwar semis in Marshalswick and Sandpit Lane tend to be easier, but plenty still run on 20-year-old boilers. Out towards Harpenden Road, Wheathampstead and Redbourn you'll find bigger detached homes with unvented cylinders, underfloor heating and the odd oil or LPG system where there's no mains gas. Hard water is a fact of life in Hertfordshire, so scale and magnetite in the system comes up in most conversations about servicing and power flushes.

The businesses on this page are drawn from third-party business listings and ranked by public review rating and review count, with a small lift for those showing a working website and phone number. We read each business's homepage to confirm heating engineers work is what they primarily offer, which keeps unrelated trades off the page. Listings flagged as permanently closed are removed automatically. Where you see a Trust Verified badge, that business has additionally passed our full verification, covering trade qualifications and accreditations, public liability insurance, trading history, customer review history and registered company information. Our How We Verify page has the full list. If a business doesn't carry the badge, we haven't independently verified it, so those checks are yours to do before you book.

Start by asking for the engineer's Gas Safe registration number and check it on the Gas Safe Register yourself, including that they're cleared for the type of appliance you have. Get two or three written quotes that name the boiler make and model, the warranty length, what's included (flue, filter, controls, removal of the old unit) and what isn't. Ask about insurance, and ask when they'd be able to start and how long the job will take. A fair quote explains itself. If someone won't put a price in writing or pushes you to decide on the spot, walk away. After any gas work, you should receive a Gas Safe certificate, and for a new boiler, a Building Regulations compliance notification and the manufacturer's warranty registration.
How We Select & Rate The Best Heating Engineers in St Albans

Businesses are ranked mainly by public review rating and review count drawn from third-party business listings, with a small lift for those showing a working website and phone number. We read each business's homepage to confirm heating engineers work is what they primarily offer. Listings flagged as permanently closed are removed automatically. Businesses marked Trust Verified have additionally passed our full verification covering qualifications, insurance, trading history, customer review history and registered company information, as set out on our How We Verify page. Other businesses here have not been independently verified by us, and inclusion is not an endorsement. Always do your own checks before hiring.

Recommended and Featured listings are paid placements, so a business's fee affects whether and where it appears. Every other listing is ranked on rating and review count from third-party business listings. How we rank & verify →

Quick Comparison: Heating Engineers in St Albans

Our Top Picks

1
Limitless Boilers Limited
Not Verified
★★★★★ 5.0 (181 reviews)
St Albans 01727 482664

Heating engineers based in St Albans, Limitless Boilers Limited covers boiler installation, servicing, and repair for residential properties in the area, making them a practical option for households across the city and surrounding neighbourhoods. The company operates under its own name rather than a franchise, keeping accountability straightforward.

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2
Boiler Repairs St Albans - Herts Boilers®
Not Verified
★★★★★ 4.9 (184 reviews)
St Albans 07944 168888

In St Albans and the surrounding Hertfordshire area, Boiler Repairs St Albans - Herts Boilers® works as a heating engineering business focused on boiler faults and servicing. The business suits households needing a boiler diagnosed, repaired or checked ahead of the colder months, with details available on its website.

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3
Portland Plumbing St Albans
Not Verified
★★★★★ 5.0 (147 reviews)
St Albans 01727 572474

Heating engineers covering St Albans and the surrounding area, Portland Plumbing LTD handles boiler installation, servicing, and general plumbing work for domestic properties. The company operates under a limited company structure, suggesting an established setup rather than a sole trader arrangement.

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4
Heat Gap-Heating and Plumbing
Not Verified
★★★★★ 5.0 (69 reviews)
St Albans 07507 554236

Heat Gap-Heating and Plumbing describes itself as a heating and plumbing business based in St Albans, and its website sets out work spanning boiler installation, servicing and repair alongside general plumbing jobs. The two trades are presented together rather than as separate departments, which suits properties where a heating fault and a plumbing issue are often linked.

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5
Aphex Heating
Not Verified
★★★★★ 5.0 (62 reviews)
St Albans 07443 916809

Aphex Heating is a heating engineering business serving St Albans and the surrounding area, covering boiler installation, servicing and repair. Work centres on domestic heating systems, from replacing an ageing boiler to diagnosing faults that leave a home cold.

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6
M & M Gas Services Ltd
Not Verified
★★★★★ 5.0 (27 reviews)
St Albans 01727 826813

Boiler installations, servicing, and gas safety work form the core of what M & M Gas Services Ltd offers to homeowners and landlords in St Albans. They are a practical first call for local residents needing a Gas Safe registered engineer. Their website outlines the full scope of work available.

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7
HeatCo
Not Verified
★★★★★ 4.6 (40 reviews)
St Albans 01727 810366

Heating engineers serving St Albans and the surrounding area, Heatco covers boiler installation, servicing, and repairs for domestic properties. The company maintains an active web presence at heatco.org.uk.

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8
AF Clark Limited
Not Verified
★★★★★ 4.8 (22 reviews)
St Albans 01727 867204

Families across St Albans and the surrounding area call on AF Clark Limited for boiler installation, servicing and repair, along with wider heating system work. The business operates as a limited company serving local households with domestic heating needs.

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9
Max Wills Heating And Plumbing
Not Verified
★★★☆☆ 3.0 (2 reviews)
St Albans 07758 136908

Max Wills Heating and Plumbing is a heating engineering firm serving St Albans and the surrounding area. Work covers the installation, servicing, and repair of heating systems and plumbing.

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10
McGregor Plumbing and Heating
Not Verified
☆☆☆☆☆ No reviews yet New
St Albans 07494 069851

McGregor Plumbing and Heating carries out heating engineering work for St Albans residents. The company covers boiler installation, servicing, and general plumbing, serving homes across the area. Straightforward pricing points to a no-nonsense operation rather than a flash-in-the-pan outfit.

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11
Alban Plumbing and Heating Ltd
Not Verified
★★★★★ 5.0 (325 reviews)
St Albans 07342 171269

In St Albans and the surrounding Hertfordshire area, Alban Plumbing and Heating Ltd provides plumbing and heating work for domestic customers. The company covers repairs, boiler servicing and installations, along with general pipework and radiator jobs.

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12
AC Plumbing and Heating LTD
Not Verified
★★★★★ 4.9 (215 reviews)
St Albans 01727 637344

Boiler servicing, central heating repairs and bathroom plumbing are the core of the work at AC Plumbing and Heating LTD, a plumber serving St Albans and the surrounding area. The business is a limited company rather than a sole trader.

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13
Abbey Plumbing & Heating St.Albans Ltd
Not Verified
★★★★★ 5.0 (166 reviews)
St Albans 07850 477195

Plumbing and heating work in St Albans and the surrounding area is the focus of Abbey Plumbing & Heating St.Albans Ltd, a local firm covering repairs, boiler servicing and installations. Residents with leaks, heating faults or system upgrades can reach it through its website.

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14
Baker Smith Ltd
Not Verified
★★★★★ 4.8 (171 reviews)
St Albans 01727 730590

Plumbing services covering St Albans and the surrounding area, Baker Smith Ltd handles domestic and commercial work. The company operates as a straightforward trade outfit, taking on the kind of day-to-day plumbing jobs that local households and businesses regularly need. More detail on their scope of work is available at bakersmithlimited.com.

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15
Right Plumbing Ltd
Not Verified
★★★★★ 5.0 (104 reviews)
St Albans 07565 189062

Right Plumbing Ltd describes itself as a plumbing firm based in St Albans, with a listed scope that covers repairs, installations and general plumbing work. Its website sets out the services in plain terms rather than elaborate packages.

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16
St Albans Plumbing Electrical Ltd
Not Verified
★★★★★ 4.7 (119 reviews)
St Albans 01727 309902

Families across St Albans call on St Albans Plumbing Electrical Ltd for repairs and installations to heating, hot water and general domestic pipework. The firm also covers electrical work, which suits households that prefer one contractor for both trades.

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17
BM plumbing and heating
Not Verified
★★★★★ 5.0 (48 reviews)
St Albans 07501 051097

BM Plumbing and Heating describes itself as a plumbing and heating contractor based in St Albans, covering general plumbing work alongside boiler and central heating services. The business lists installation, repair and servicing among its core jobs, keeping its scope to the two trades named in its title.

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18
I Delta Heating and Electrical Specialist Limited
Not Verified
★★★★★ 5.0 (20 reviews)
St Albans 01727 227515

I Delta Heating and Electrical Specialist Limited is an air conditioning contractor based in St Albans, with heating and electrical work sitting alongside its cooling installations. That combined skill set suits jobs where a new unit needs wiring, a power supply or a link to existing heating.

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19
CK Plumbers Ltd
Not Verified
★★★★★ 5.0 (7 reviews)
St Albans 07723 314021

CK Plumbers Ltd is a plumbing firm based in St Albans. The business covers general plumbing work for households in the city and nearby areas. Its website carries a dedicated contact page, so enquiries can be made online without needing to phone first.

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20
Priority Plumbers
Not Verified
★★★★★ 4.7 (12 reviews)
St Albans 07713 113305

Plumbing work across St Albans and the surrounding area is the focus of Priority Plumbers Ltd, a local outfit covering both domestic and general plumbing requirements. It is a practical option for residents who need reliable local cover without looking further afield.

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21
iGas Heating
Not Verified
★★★★★ 5.0 (3 reviews)
St Albans 01727 537076

iGas Heating is a plumbing and heating business serving St Albans and the surrounding Hertfordshire area. Its work centres on domestic heating systems, from boiler installation and servicing to general plumbing repairs. The business operates under the Herts Heating name online, which reflects its focus on households across the county rather than a single postcode.

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Transparency notice: Recommended and Featured listings are paid placements, so a business's fee affects whether and where it appears. All other listings are ranked by a combined score drawn from ratings and review counts published on third-party business listings, plus basic completeness signals such as a working website and phone. A Trust Verified badge means we have independently checked that business's documents; businesses without it have not been independently verified by us. How we verify →

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Frequently Asked Questions

How much does a heating engineer cost in St Albans?
Expect to pay roughly £70 to £100 for an annual boiler service, and £90 to £150 for a call-out with labour for a repair, plus parts. A like-for-like combi boiler swap usually lands between £2,000 and £3,500 fitted, depending on the make, output and whether the flue needs moving. A system boiler with a new cylinder, or a job that involves rerouting pipework in an older terrace, can run to £4,000 or more. A power flush typically costs £400 to £800. Prices vary with boiler brand, access, how much pipework is replaced and how busy the engineer is. Getting two or three quotes is normal, and you should compare what's included, not just the headline figure.
Does my boiler need an annual service?
Yes, it's worth doing every year, and many manufacturers make it a condition of the warranty. A service covers checking the flue, combustion readings, pressure, the heat exchanger and safety devices. In St Albans, where the water is hard, it also gives the engineer a chance to spot scale and sludge before they cause breakdowns. Book in late spring or summer when engineers have more availability, rather than waiting for the first cold snap. Keep the paperwork, as it helps if you ever claim on a warranty.
Should I replace my old boiler or keep repairing it?
As a rough guide, if the boiler is over 12 to 15 years old, parts are hard to find, or you're facing a repair costing more than a third of a new unit, replacement usually makes sense. A modern condensing boiler is far more efficient than an older non-condensing model, so you should see a drop in gas use. Ask the engineer to size it properly for your home rather than just matching the old output, as oversized boilers cycle on and off and waste fuel. If your boiler is under warranty, check the terms before paying for repairs.
Is a heat pump a realistic option for a St Albans home?
It can be, but it depends on the property. Newer homes and well-insulated houses suit heat pumps best. Many Victorian terraces and older semis need insulation work, and often larger radiators, before a heat pump performs well. You'll also need outside space for the unit and, usually, a hot water cylinder. Government grants have been available for eligible installations, so check the current terms. A good installer will do a room-by-room heat loss calculation and explain the running costs honestly, rather than just quoting a unit price.
What paperwork should I get after a boiler installation?
You should receive a Gas Safe certificate or commissioning record, the manufacturer's warranty registration details, and confirmation that the installation has been notified to Building Control, which a registered installer normally does for you. Keep the user manual and any service records together. If you're selling later, a buyer's solicitor will often ask for these. If an engineer doesn't mention paperwork at the end of the job, ask for it before you pay the final invoice.
How do I check a heating engineer is legitimate before booking?
Ask for their Gas Safe registration number and look it up on the Gas Safe Register website, checking that the engineer's photo and the type of gas work they're cleared for match your job. Ask for proof of public liability insurance and check it's in date. Read recent online reviews and look for how they handle complaints, not just the star rating. Get the quote in writing with the boiler make and model, warranty length and payment terms. Be wary of large upfront deposits, and don't pay in full until the work is finished and you have your certificate.