What We Do
Six core services covering everything your home needs — from a new boiler installation to a full bathroom remodel — all delivered by Gas Safe registered engineers based in St Albans.
New A-rated combi, system & regular boilers from Worcester, Vaillant, Ideal & Baxi — with up to a 12-year warranty.
Get a quote →Annual servicing, fault diagnosis and same-day repairs on all makes and models — keeping your boiler safe and efficient.
Learn more →Gas safety checks, certifications and Landlord Gas Safety Records (CP12) — completed by Gas Safe registered engineers.
Learn more →Leaks, taps, toilets, radiators, pipework, water tanks and full system upgrades — plumbing services you can trust.
Learn more →Design and installation of stunning new bathrooms — from supply & fit through to tiling, plumbing and finishing touches.
Learn more →Kitchen plumbing, gas lines, leaks, dishwashers, smart heating controls — or a midnight emergency call-out. Whatever your home needs, get in touch and we'll take care of it.
Get in touch →What's Included
Replacing a boiler shouldn't be stressful. We handle the design, supply, removal, install, commissioning and certification — leaving you with a warm home and complete paperwork in one day.
What Our Customers Say
Hertfordshire homeowners and landlords across St Albans, Harpenden, Hatfield, Watford and beyond rely on Heatgap for honest advice and quality workmanship.
"Quick, professional and friendly — fitted a new Worcester combi in a day with zero mess. The engineer talked me through everything and the price was exactly what was quoted. Highly recommended."
"Boiler died on a Sunday night. Heatgap answered first ring and were here within the hour. Got us heating again and didn't try to upsell. These are the guys to call."
"Full bathroom remodel — tiling, plumbing, the works. Came in on time and on budget. Looks fantastic and the team kept the rest of the house spotless throughout."
"Annual service done thoroughly and properly. Honest engineers — pointed out a small issue and fixed it on the spot rather than scaring us into a new boiler. Will use every year."
"We're a small lettings business and use Heatgap for all our CP12 gas safety checks. Always punctual, always paperwork on the same day. Brilliant service."
"Kitchen tap was leaking and the previous plumber couldn't sort it. Heatgap came out next day, diagnosed it in 10 minutes and fixed it without replacing anything unnecessary."
"Brand new bathroom installed top to bottom. Lovely lads, polite and tidy. Communicated really well throughout and the finished room is genuinely beautiful. Worth every penny."
"Lost hot water on a Saturday evening — Heatgap had us back up before bedtime. Reliable, knowledgeable, and properly priced. They've earned a customer for life."
"Quick, professional and friendly — fitted a new Worcester combi in a day with zero mess. The engineer talked me through everything and the price was exactly what was quoted. Highly recommended."
"Boiler died on a Sunday night. Heatgap answered first ring and were here within the hour. Got us heating again and didn't try to upsell. These are the guys to call."
"Full bathroom remodel — tiling, plumbing, the works. Came in on time and on budget. Looks fantastic and the team kept the rest of the house spotless throughout."
"Annual service done thoroughly and properly. Honest engineers — pointed out a small issue and fixed it on the spot rather than scaring us into a new boiler. Will use every year."
"We're a small lettings business and use Heatgap for all our CP12 gas safety checks. Always punctual, always paperwork on the same day. Brilliant service."
"Kitchen tap was leaking and the previous plumber couldn't sort it. Heatgap came out next day, diagnosed it in 10 minutes and fixed it without replacing anything unnecessary."
"Brand new bathroom installed top to bottom. Lovely lads, polite and tidy. Communicated really well throughout and the finished room is genuinely beautiful. Worth every penny."
"Lost hot water on a Saturday evening — Heatgap had us back up before bedtime. Reliable, knowledgeable, and properly priced. They've earned a customer for life."
Service Areas
Based at Hatfield Road in St Albans, we cover homes and businesses across St Albans and the surrounding Hertfordshire towns and villages. Not sure if you're in our area? Just give us a call.
Our Process
From your first phone call to the final certificate, our process is clear, fixed-price and Gas Safe certified — no surprises.
We visit your home, listen to what you need, look at the existing system, and give you a clear fixed-price quote — no pressure, no jargon, no upsells.
Choose a day and time that works for you. Most boiler installs are completed in a single day with minimal disruption.
Our Gas Safe registered engineers carry out the work to manufacturer specification, with clean dust sheets, system flush and full commissioning.
Before we leave, we'll walk you through the controls, smart thermostat (if fitted), and answer any questions about the new system.
You'll get your Gas Safe certificate, Building Regulations notification, and a friendly reminder when next year's service is due.
Why Heatgap
Choosing a heating engineer or plumber is a trust call. Here's why hundreds of Hertfordshire homeowners pick Heatgap — and why most of them stay with us year after year.
Every gas job is carried out by a fully qualified, Gas Safe registered engineer — no exceptions, no subcontractors.
Burst pipe? No heat? No hot water? We're available day and night, weekends and holidays included.
What we quote is what you pay. We do the survey, we lock the price — no hidden extras, ever.
We're based in St Albans, we live here, and we want your repeat business — which means doing it right the first time.
Get In Touch
Tell us what you need and we'll come back to you the same day. For 24/7 emergencies, call us straight away on 07507 554236.
No call centres, no waiting on hold — your enquiry comes straight through to the team.
Heatgap Insights
Practical advice from our team on getting the most out of your boiler, planning a bathroom refit, and staying gas-safe at home.
Strange noises, rising bills and patchy radiators? Here's how to know when it's time to stop repairing and start replacing.
From layout decisions to choosing taps and tiles — how to plan a bathroom refit that runs to time and budget.
Your obligations as a landlord under Gas Safe regulations — what's checked, what's recorded and how often.
Trusted Brands We Install & Service
FAQs
The questions Hertfordshire homeowners ask us most often. Don't see your question? Just give us a ring.
Yes — every gas job we carry out is completed by a Gas Safe registered engineer. Our Gas Safe ID is displayed in our van and on our certificates, and you can verify any registered engineer at gassaferegister.co.uk.
Yes. If you've got a burst pipe, a gas leak, no heating or no hot water, call 07507 554236 day or night. We aim to get an engineer to St Albans and surrounding areas within the hour.
Most straightforward combi-to-combi swaps are completed in a single day. Boiler upgrades or full system conversions usually take 1–2 days. We'll give you an exact timescale in your fixed-price quote before any work starts.
We're approved installers for Worcester Bosch, Vaillant, Ideal, Baxi, Glow-Worm and more. Depending on the brand, we can offer manufacturer-backed warranties of up to 12 years.
Yes — every quote we provide is fixed. We survey the job in person, lock the price, and that's what you pay. No hidden extras, no day-rate surprises.
Absolutely. We design and install full bathroom remodels (tiling, plumbing, electrics — all coordinated), and we also handle kitchen plumbing, dishwasher installs, sinks, taps and gas lines for new hobs.
We're based on Hatfield Road in St Albans and cover Harpenden, Hatfield, Welwyn Garden City, Watford, Radlett, Hemel Hempstead, Borehamwood, Wheathampstead, London Colney, Bricket Wood, Potters Bar and most surrounding villages. Outside that area? Call us anyway — we often can.
About Heatgap
Heatgap Heating & Plumbing is a Gas Safe registered heating, gas and plumbing company based in St Albans, Hertfordshire. From boiler installations and gas engineering through to bathroom remodelling, kitchen plumbing and emergency call-outs — reliable, professional and always on hand.