Whether you require a new boiler, central heating system, fireplace, bathroom, kitchen, bedroom or plumbing maintenance work we have an expert team of heating and plumbing engineers ready to help. Gas Mark 1 are the one-stop shop for all your home-interiors, providing first class installations and top quality customer service. Based out of our Watford showroom, we have been serving the local area for over 20 years and whatever your requirements we can provide high standard cost-effective solutions to suit your needs.

Read our posts to find out some useful advice and helpful tips regarding plumbing and heating as well as information about the wide range of installation and maintenance services we are able to provide and have specialists in.

Whether you require a new full Central Heating system, an upgrade to your existing system or are looking to change to electric or renewable energies, Gas Mark 1 have the experience and expertise to carry out the work to the highest standard with minimum fuss. Our experienced and Gas Safe registered, in-house trained heating teams are qualified in all areas of Central Heating from under floor heating and unvented cylinders to warm air units and solar powered systems. Along side boiler installations, Gas Mark 1 are specialists in the installation and upgrading of domestic central heating systems.

Gas Mark 1 are the largest independent installers of domestic boilers in Watford and the surrounding areas, carrying out boiler and central heating installations since 1993. Boiler installations are where our company started and we have gained our reputation through our consistently high quality, vast experience and competitive prices. Our engineers are all Gas Safe Registered and we will install any boiler brand available but prefer to installVaillantorWorcester Boschboilers as they are generally considered the most reliable.

As well as the supply and installation of the more traditional heating methods, Gas Mark 1 work with renewable energies and are installers of Solar panels and Solar hot water heating. Solar water heating systems are a renewable technology range which can deliver up to 60% of your annual hot water requirements. Solar water heating systems use free heat from the sun to warm domestic hot water through the installation of solar panels. Reduced energy bills - less money will be spent on your energy bills as solar systems can provide up to 60% of your annual hot water.

Since 1993 Gas Mark 1 have been the largest independent installers of new boilers and central heating systems in Watford, Hertfordshire and the surrounding areas. We've built up our reputation by providing first class service and quality installations as well as superb value for money. We recommend only the leading manufacturers of appliances and fittings to ensure the longevity and reliability of our installations. Gas Mark 1 install approximately 400 boilers a year. We can install any boiler brand available but through our vast experiencewe recommend either Vaillant or Worcester Bosch boilers, which can come with aparts and labour warranty of up to 10 years.

From radiator installations to valve updates and radiator maintenance, Gas Mark 1 have both the products and knowledge to deal with any enquiry. Along with our sister company Herts Bathrooms, we can supply and install all of the top brands of designer or standard radiators, towel radiators and radiator valve brands. Our friendly and helpful team are on hand to offer advice and assistance on ensuring you get the right radiator for your home. We can also offer home visits where we carry out heat loss calculations to make sure your new radiator is correctly sized.

If you would like the effect and feel of a log burner but with the convenience of a gas fire then a Gas Stove is the perfect option. They come with the same log burning effect and high efficiency but without the hassle and cleaning up required with a wood burning or multi-fuel stove. Gas Mark 1 have a great selection available from the leading manufacturers. Nothing quite beats the ambience of a real fire glowing in your living room. As an alternative to a fireplace, multi-fuel stoves are a convenient, heat efficient and cost effective way to add an eye-catching centrepiece to your home.

At Gas Mark 1 we offer a complete design, supply and installation package and have an extensive choice of fireplaces, stoves, gas and electric fires and fire accessories available from the leading manufacturers. Gas Mark 1 have over 20 years experience of supplying and installing gas and electric fireplaces. At our largeWatford fireplace showroomwe have many fireplaces on live display and are on hand to give you expert advice on choosing the right fire for your home. We have many beautiful designs on show and display surrounds in a variety of styles and materials including marble, limestone, tiled, cast iron as well as many others.

Underfloor heating offers a brilliant modern alternative to having radiators in your home. Gas Mark 1 have several teams specialised in the installation of underfloor heating. There are many different options of underfloor heating available meaning we can provide you with a tailored design and solution that is best suited for your home. Underfloor heating is a method of warming a room using the principle of heat rising from below. It can be installed in any room and under basically any surface from concrete and tiled to wooden and carpeted flooring.

Gas Mark 1 have a long standing reputation as one of the largest independent providers of plumbing services across Watford and the surrounding areas. Our experienced diversely-skilled team are able to carry out a comprehensive range of plumbing work no matter how large or small. Through our longevity and workmanship we have developed a name as one of the foremost providers of trustworthy, reliable and high-quality plumbing services. Our engineers are all Gas Safe Registered and can carry out emergency call-outs for services such as burst water pipes, gas leaks, boiler breakdowns, blockages, bathroom and kitchen leaks for customers in areas including Watford, Hemel Hempstead, St Albans, Harrow, Edgware, Amersham, Luton and many more.

Gas Mark 1's main priority is to ensure that every job is completed with the same level of service and quality. Every member of our friendly and helpful team, from office staff to surveyors and engineers are dedicated to providing you with the highest standard of customer satisfaction. Gas Mark 1 was founded in 1993 by two ex-British Gas engineers and school friends Tony Vico and John Henderson. To this day they still carry out all the surveys and site consultations to give you peace of mind you are receiving experienced, free, impartial advice on what is best for you.

One of Gas Mark 1's main strengths is our team of skilled engineers who carry out the installation of bathrooms, kitchens and bedrooms. Installations are where Gas Mark 1 started and are what sets us apart from the competition. We pride ourselves on our hard work and customer service, meaning that you can be assured your installation is carried out to the highest standard with minimum fuss by engineers you will be happy to have in your home. Gas Mark 1 are the installers of our sister company Herts Bathrooms, who provide an exquisite and large range of Bathrooms, Kitchens and Bedrooms.

The impact of your boiler breaking down or central heating system suddenly not working can result in you being left with no heating or hot water, our experts at Gas Mark 1 on-hand to resolve your problems as quickly as possible by providing the best solution with minimum fuss. From our Watford office we are perfectly situated to attend to any heating or plumbing issue across Hertfordshire, Bedfordshire, Buckinghamshire and North West London. For more than 20 years Gas Mark 1 have built up a reputation for providing a trustworthy reliable service, giving knowledgeable expert advice and carrying out high-class repair work.

In the absence of a chimney or flue and if you don't have gas in your property, electric fires are an elegant, hassle-free alternative to creating the wonderful, cosy feeling of a fireplace in your home. As well as being cheap to install and easy to maintain they are also 100% efficient at the point of use. Gas Mark 1 have many electric fires and suites available in every style, from the traditional and classic to the ultra-modern and contemporary. Many electric fires now use L.E.D. lighting to lower running costs and to give a more realistic electric flame effect.

Gas Fires are a stunning focal point that can light up any room, creating a lovely feeling of warmth and comfort. Whether you require a contemporary or traditional design, decorative or high-efficiency fire Gas Mark 1 have an expert team available to help you choose the perfect style of gas fire for your home. There are many types of gas fire including class I and II chimneys, balanced flue, flueless, precast and power flue, you can be assured that we have the fire to suit your every need. Visit our Watford showroom to see different styles of Gas fire on live display or for more information contact us.

Jason and his apprentice fitted our new central heating boiler and replacement cylinder this week. What a pleasure to have a job quoted, carried out with the minimum of fuss and disruption, maximum efficiency, for a great price and they cleared up after themselves as well! Superb service! I would highly recommend. Thank you.

Boiler service today. Once again your guys are polite and careful, always respectful. Would recommend your company to anyone. Thank you.

A huge big thankyou to John Henderson for sending Tom and Chris to our home and installing a new boiler. being without heating and hot water became a matter of some urgency due to my job as a childminder and they certainly pulled out the stops to get us up and running promptly. Tom and Chris were polite, thorough, worked really hard and cleared up behind themselves with little eyes peering at them every step of the way. can't thankyou enough. will certainly be recommending. Amanda Chaston

What's new?

Please share this. We have just received a phone call from the daughter of an 80 year old long standing customer. The lady was called by a company that said Gas Mark 1 had gone out of business and they were taking over all of our clients. They asked the lady to set up a direct debit with them.

Posted on Jan 21, 2021  •  Facebook

Especially for vulnerable customers, but obviously for everyone else as well.

Posted on Jan 09, 2021  •  Facebook

Following the latest lockdown announcement, please be assured that WE ARE OPEN FOR BUSINESS. Our engineers work to strict COVID procedures to keep our customers safe. If during this cold spell you need a new boiler or boiler repair call us for a prompt, speedy reliable service. Proudly serving Watford for 27 years. Please feel free to share this as it might help a vulnerable person needing help during this cold spell

Posted on Jan 05, 2021  •  Facebook

Great work Jason, another happy customer. Please remember that we will still be available to look after our customers during the lockdown. If you have any plumbing or heating problems call us on 01923 231780 and we will do our best to look after you. Thank you from all at Gas Mark 1 for your support, stay safe and healthy.

Posted on Nov 02, 2020  •  Facebook

Well done Paul Batchelor and Rhys Jenkins

Posted on Oct 12, 2020  •  Facebook

Amazing recent installation by our engineer Dave! Quality prodcuts supplied by our sister company @HertsBathrooms 😍… https://t.co/19D7XTs2sF

Posted on Mar 20, 2019  •  Twitter

Gas Mark 1 have several installation teams ready to install your dream bathroom. Please read our latest blog about… https://t.co/rxg273QrmW

Posted on Dec 07, 2018  •  Twitter

To give customers a better idea about what we do and provide useful tips we've started our own blog. Click below fo… https://t.co/EYHG9oLmLV

Posted on Oct 19, 2018  •  Twitter

That #FridayFeeling !! Some lovely comments on a recent bathroom installation. Thanks Mr and Mrs Wilson! #watford… https://t.co/O5uUGAS4Jf

Posted on Oct 12, 2018  •  Twitter

👨‍🔧👨‍🔧Carried out this rather tidy double boiler @vaillantuk installation this week! #watford #harpenden https://t.co/9ODL2anHk8

Posted on Aug 17, 2018  •  Twitter

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