What are the opening hours?

Monday 9am - 5pm Tuesday 9am - 5pm Wednesday 9am - 5pm Thursday 9am - 5pm Friday 9am - 5pm Saturday 9am - 5pm

Gas Mark 1

Providing first class installations and top quality customer service. We also have a sister company Herts Bathrooms and Kitchens.

Hertfordshire's leading Gas Showroom and with fireplaces, gas and electric fires, cookers and all gas appliances. We are the premier installer of boilers and central heating in the area with our own highly skilled engineers and dedicated back office support.

15/06/2026

🔥 Great service deserves great feedback! 🔥

Nothing means more to us than hearing from happy customers. Whether we’ve installed a new boiler, repaired a heating fault, or carried out a service, your reviews help others choose a heating engineer they can trust.

With Safety Month underway, it’s also a great reminder that a safe, reliable heating system starts with professional installation and regular maintenance. 🏡✅

💬 Have we completed work for you recently?

We’d love to hear about your experience! Leaving a quick Google review only takes a minute, but it makes a huge difference to our business and helps other homeowners find a trusted local expert.

⭐ Click the link in our bio/comments and leave your review today.

Thank you to all our customers for your continued support and kind words—we genuinely appreciate every review.

👇 Have we helped keep your home warm and safe? Tell us about it on Google!

12/06/2026

A huge congratulations to our apprentice Finley on passing Level 2 plumbing & heating at

You’re hard work, dedication and commitment have paid off and we are proud of what you’ve achieved. This is a fantastic milestone in your career, and we look forward to seeing you grow with us and succeed in the industry.

Well done from everyone at Gas Mark 1! 🎉🥳

10/06/2026

🏠 Is your property safety-ready?

June is National Safety Month, making it the ideal time to check that your gas appliances are operating safely and your carbon monoxide alarms are working as they should.

We offer:
🔧 Gas appliance servicing
📋 Landlord Gas Safety Certificates (CP12)
🚨 Carbon monoxide alarm replacements

A small check today could prevent a bigger problem tomorrow.

Message us with your contact details and will will call you back. Or give our office a call on 01923 231780.

09/06/2026

🧼🛀 Showroom opportunity ✨
We have a number of ex-display items available at clearance prices- this is a chance to grab a premium bathroom feature for a fraction of the original price!

DM us or email [email protected] for more information

05/06/2026

🥰 After 30 years we said a heartfelt thank you and goodbye to director of Herts Bathrooms Kevin this week.

Kevin has been a huge part of our family business over the years, and we’d like to thank him for everything he has done for the company, our team and customers.

We wish him all the very best for the future and hope he enjoys every minute of retirement.

Thank you Kev, you’ll always be part of the family. 🥂

27/05/2026

🌟🌟🌟🌟🌟 Our customers say it best!

We’re proud to share some of our latest 5 star google reviews. Our team is committed to delivering quality workmanship and customer care every step of the way.

A huge thank you to all our customers for your kind words and continued support.

Thinking about your next home improvement project? Get in touch with our trusted team today.

20/05/2026

Learning never stops here at Gas Mark 1 Herts Bathrooms & Kitchens 📚💡

This we’re celebrating the people behind our business and the importance of developing new skills. From apprentices learning on site to experienced engineers expanding their knowledge and support stuff developing their confidence.

We are proud to support learning across every department!

18/05/2026

🔧🏡Attention to detail makes all the difference.

Another neat and tidy boiler installation completed by Taylor from the heating team at Gas Mark 1 including the neatly patched matching brickwork to leave the outside looking just as good as the inside 👌
We believe great workmanship is about more than just the boiler itself- it’s about leaving every job clean, professional, and finished to a high standard for our customers.

Thinking about upgrading your boiler? Get in touch with our team today for friendly advice and a free quotation. 📞

15/05/2026

Teaching the apprentice the fun part first!
Our Senior Kitchen Installation engineer Jamie B and our apprentice Scott this week getting another space ready for a fantastic Gas Mark 1 Herts Bathrooms and Kitchens job.

Happy Friday everyone!

24/04/2026

⛳️ some well deserved staff bonding this week and a visit to … congratulations to Sarah and Barney who were victorious! Rematch anyone? ⛳️

Address

15-21 Market Street
Watford
WD180PA

Opening Hours

Monday	9am - 5pm
Tuesday	9am - 5pm
Wednesday	9am - 5pm
Thursday	9am - 5pm
Friday	9am - 5pm
Saturday	9am - 5pm

Website

http://www.gasmark1.com/

Alerts

Be the first to know and let us send you an email when Gas Mark 1 posts news and promotions. Your email address will not be used for any other purpose, and you can unsubscribe at any time.

Want your business to be the top-listed Contractor in Watford?