Heating Engineer London

All aspects of Heating and Plumbing undertaken in London, Hertfordshire and Essex

Assert Heating Services represents the breaking edge in delivering complete gas & heating services throughout London and the surrounding areas. We are constantly building our portfolio for modern plumbing, gas and heating engineering from small to larger projects.

We were originally founded in 2003 and have been bringing innovative, specialised heating services to London and the surrounding areas ever since. Over the years we managed to gain an extensive array of experience in the plumbing and heating trade and have built up an impressive list of ongoing customers as we strive to improve the quality of residential heating systems in and around London. We are established partners and approved installers of a number of boiler manufacturers including Worcester Bosch and Vaillant.

What service are you looking for?

Assert Heating Services is a leading provider of extended heating services to homeowners and businesses in London and the surrounding areas.

What service are
you looking for?

Assert Heating Services is a leading provider of extended heating services to homeowners and businesses in London and the surrounding areas.


We offer extensive gas service solutions. From gas safety checks, gas safety certifications to gas leak repairs and other gas services in London.

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Our team of plumbing engineers work fast and efficiently and can carry out a range of services from routine leaks to advanced system problems.
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Our team of gas safe heating engineers carry out boiler repairs, install state of the art heating systems and implement system upgrades on a daily basis.
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Valliant Boiler Service London

We provide thorough 12 point checks on your Valliant Boiler, carried out by an expert gas safe engineer. Our Valliant boiler service in London will ensure that your Valliant boiler is working safely and efficiently. Future issues can also be spotted earlier, reducing the chances of a replacement being required.

What our customers say

We care what our customers think of us and love to hear your feedback, if you would like to know what we can do for your home or business give us a call today and we’ll be happy to help!

Senake Hettiarachchi

Speedy and efficient job at a fair price. Very satisfied

richard , CM20
Gas / Heating engineer

Recently used Assert after my usual plumber couldn’t come out quick enough for a burst pipe in one of my properties and am very glad I did. Assert were quick to respond and fixed the issue to a high standard in next to no time. Great service all round. Looks like Assert might be my new port of call for any emergencies.

Quick and professional during an emergency.

Great workmanship, friendly and helpful. Assert were fairly priced and trustworthy.
We had our boiler position moved as well as a new one installed. All our needs were met quickly and professionally. We will be sure to use them in the future. Can not recommend enough.

Simon Thompson

I had a boiler installed recently and would recommend their services! Reliable, honest and competitively priced.

Lyndsey Page

Great experience with Assert, can’t thank enough!

charlotte baird

We called Ryan on a recommendation to look at our hot water system which had stopped working. Ryan came as soon as he could and though the problem was a mystery he figured it out quickly and came back the next day with the right parts to fix. He was efficient, courteous and helpful. His price was fair and we will use him again. Thanks Ryan. Ina Norrman

Ina Norrman

Really good work very professional.


Cant recommend this guy enough, Assert Heating Services provided a great service during this difficult time. Ryan was professional and clear about the problem I had with my boiler. He took the time to talk me through and show me where the issue was. I didnt feel harrased, he let me think about replacing the boiler before I called him in to do the job. All in all, great job and I now have hot water again. Highly recommend.

helen georghiou

Very good service. On time friendly & efficient.
Leroy Pitter

Boiler repair. Excellent service

Very quick, clear communication, highly recommend

Alastair , E17
Gas / Heating engineer

Great service Ryan. Arrived on time, very friendly & sorted out the boiler problem efficiently. We’d definitely recommend your services.

Leroy Pitt

I have used Ryan a couple of times and he is very professional knows his stuff no job to big or small he has every part needed for the job I can’t recommend him enough and will be passing his details on to friends and family and will not hesitate to call him again if I have anymore problems
a big thank you for reconnecting my cooker again
Grateful customer

Lele Williams

Ryan was friendly, efficient and knowledgable. He serviced our Worcester Bosch boiler today.

Brian , NW11
Gas / Heating engineer

Professional, efficient and friendly with lots of good advice – identified problem and fixed leak leaving everything clean and tidy – would highly recommend.
John & Marion London N11

Highly recommend Assert Heating Services
back beat

Our boiler broke down a week ago and Assert were quick to respond especially given the current circumstances. great value and service, cannot thank enough.
Cheers, all the best.

Omar El-sayed

Thanks to Ryan for punctually arriving at my mum’s and quickly sorting boiler issue. My mum would have been without water and heating otherwise. Great value callout and great quality work. Will be using Assert every time now for future work. Chris

Chris Steele

Prompt reply, smooth communication.

khalid , E17
Gas / Heating engineer

Thank you Assert Heating for your very quick response. Boiler issue was sorted quickly and professionally. Your engineer was polite and respectful of social distancing, wore gloves and mask. Fully recommend!

Elena Sophocleous

Been using Ryan for all my heating and gas needs over the years.
He’s always prompt and carries out a good job.
Highly recommended.

Eric Ibekwem

Ryan was very polite and friendly . I would definitely use Assert heating again and due to professionalism. I would recommend them to others in the future.

Sandra Garbet
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Plumber in London