Our Services
Gas Safe registered specialists covering Hertfordshire and London.
Complete Gas, Plumbing & Heating Solutions
From boiler installations to bathroom renovations, we handle every aspect of gas, plumbing and heating work to the highest standard.
Our team holds over 50 years of combined experience and is fully Gas Safe registered and IPHE accredited. We work across residential and commercial properties throughout Hertfordshire and London.
Whether you need a new boiler fitted, a bathroom installed or a drainage blockage cleared, we'll give you honest advice, a fair quote and a professional job every time.
Everything We Offer
We cover all aspects of gas, plumbing and heating - from routine maintenance to full installations.
Boiler Installations
Whether your old boiler has given up or you're upgrading for better efficiency, we supply and install high-quality boilers from leading manufacturers including Vaillant. As Vaillant Advance Installers, we have the skills and accreditation to ensure your new boiler is fitted correctly and runs at peak performance.
We'll advise you on the best boiler for your home, taking into account your heating needs, hot water demand and budget. All installations come with full commissioning and handover, and we'll register your warranty on your behalf.
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General Heating
From central heating installations and radiator upgrades to powerflushing and system maintenance, we cover every aspect of your home's heating system. Our engineers are experienced in all types of wet central heating systems and can diagnose and resolve problems quickly.
If your heating isn't performing as it should - whether that's cold spots on radiators, noisy pipework or inefficient boiler cycling - we can identify the cause and carry out the necessary work to restore your system to full efficiency.
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Powerflushing
Over time, central heating systems accumulate sludge, rust and debris that reduces efficiency and causes cold spots, noisy pipework and higher energy bills. A powerflush uses specialist equipment to pump a chemical cleaner through your system at high velocity, removing the build-up and restoring performance.
We strongly recommend a powerflush before fitting a new boiler to an existing system - it is often required to validate your new boiler's warranty. After flushing, we add a long-lasting inhibitor to prevent future corrosion and scale.
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Landlord Gas Safety Certificates
Landlords are legally required to have a valid gas safety inspection carried out on all gas appliances and flues in their rental properties every 12 months, by a Gas Safe registered engineer. We carry out thorough inspections and issue your Gas Safety Record (CP12 certificate) on the day.
All our engineers are fully Gas Safe registered. We offer flexible appointment times to suit landlords and tenants, competitive fixed rates, and annual reminders so your certificate never lapses.
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Bathroom Installations
From a simple shower replacement to a full bathroom renovation, we carry out all the plumbing work required to bring your new bathroom to life. We install baths, showers, toilets, basins, wet rooms and more, ensuring pipework is correctly routed, sealed and tested.
Our team takes care over tidy workmanship and we always leave the site clean and tidy. We'll work to your timeframe and coordinate with any other tradespeople involved in your project to keep things running smoothly.
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Plumbing
From leaking pipes and dripping taps to full re-pipes and cylinder replacements, we handle all general plumbing work across domestic and light commercial properties. We use quality materials and take time to diagnose problems correctly before carrying out any work.
No plumbing job is too big or too small. Whether it's an urgent leak or a planned upgrade, we'll provide a clear quote and carry out the work to a high standard with minimum disruption to your home.
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Water Filters
We supply and install a range of water filtration systems for domestic properties, helping to improve the quality and taste of your drinking water. From under-sink drinking water filters to whole-house scale reducers and softeners, we'll help you choose the right system for your needs.
Particularly useful in the hard water areas of Hertfordshire and London, a water filter can protect your appliances, reduce limescale and improve the quality of water used for drinking and cooking. We handle full installation and commissioning as part of our service.
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Unvented Cylinders
Unvented hot water cylinders deliver mains-pressure hot water throughout your home, eliminating the need for a cold water tank in the loft. This means better water pressure at every outlet and a more space-efficient system overall.
Installation and commissioning of unvented cylinders must be carried out by a suitably qualified engineer. Our team holds the relevant G3 qualification and can advise on the right cylinder size and specification for your property, ensuring a safe and compliant installation.
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Have a Specific Requirement?
Not sure whether we cover your job? Give us a call or send a message and we'll be happy to advise.
Get in TouchWhy Choose 1st Avenue Gas Plumbing & Heating Services?
With over 50 years of combined experience and a string of professional accreditations, there are plenty of good reasons to choose 1st Avenue Gas.
Gas Safe Registered
All our engineers are fully Gas Safe registered. You can trust every gas job is carried out safely and in full compliance with regulations.
50+ Years Combined Experience
Our team brings over 50 years of combined expertise across gas, plumbing, heating and drainage - giving you the benefit of experience on every job.
Vaillant Advance Installer
As accredited Vaillant Advance Installers, we're qualified to install and service Vaillant boilers to the manufacturer's exacting standards.
Family-Run Business
We're a family business through and through - which means you'll always get a personal, honest service and a team that genuinely cares about the work they do.
Competitive Pricing
We offer fair, transparent pricing with no hidden costs. You'll always get a clear quote before any work starts, so there are no surprises when the job is done.
Tidy & Reliable
We arrive when we say, work efficiently and always leave your home clean and tidy. Our customers consistently highlight our punctuality and respect for their property.
Frequently Asked Questions
Can't find what you're looking for? Get in touch and we'll be happy to help.
Yes, all our engineers are fully Gas Safe registered. Gas Safe registration is a legal requirement for anyone carrying out gas work in the UK, and you can verify our registration on the Gas Safe Register website. Never allow anyone to carry out gas work in your home who cannot prove their Gas Safe registration.
We cover a wide area across Hertfordshire and London, including Harrow, Watford, Bushey, Stanmore, Edgware, Barnet, Northwood, Pinner and surrounding areas. If you're unsure whether we cover your location, just give us a call or send a message and we'll let you know.
Yes, we carry out annual boiler services as well as full boiler installations. Regular servicing keeps your boiler running safely and efficiently, helps maintain your manufacturer's warranty, and can identify potential issues before they become costly problems. We recommend having your boiler serviced every year.
A straightforward like-for-like boiler replacement typically takes one day. More complex installations - for example, where the boiler is being moved to a different location, or where additional work such as a system flush or pipework upgrade is required - may take longer. We'll give you a realistic timeframe as part of your quote.
Yes, we're happy to provide free, no-obligation quotes for all work. You can contact us by phone, email or through our online form to arrange a visit or discuss your requirements. We'll give you a clear, itemised quote before any work begins - there are no hidden charges.
What can we do for you?
Get in touch today for a free, no-obligation quote. We're here to help with all your gas, plumbing and heating needs.