Endorsed by Which?

AOS Energy Efficient Heating Systems Limited

4.9

227 Reviews

Opening Hours
Today - 08:00–17:00
  • Monday 08:00–17:00
  • Tuesday 08:00–17:00
  • Wednesday 08:00–17:00
  • Thursday 08:00–17:00
  • Friday 08:00–17:00
  • Saturday - Closed
  • Sunday - Closed

What is a Which? Trusted Traders Hertfordshire Trading Standards Approved Endorsement?

Which? Trusted Traders has partnered with Hertfordshire Trading Standards to create a Hertfordshire Trading Standards Approved endorsement. In addition to our standard trading standards assessment, this trader has had a DBS check and is subject to a Trading Standards intelligence check

About

AOS Heating has been one of the industry's leading experts in the Heating & Boiler industry for over 36 years.
Established in 1984, AOS are family run business who is proud of the reputation we have accomplished over the years.
AOS are a trusted company due to our outstanding customer service record, not only do we provide an honest, reliable service we also offer first class central heating, electrical & plumbing services for all.
Whether you need repairs or servicing to an existing heating system or you are interested in a completely new central heating installation we'll make sure you get the best results.
What's more AOS are also specialists in the most up-to-date heating advancements, including renewable & green technologies such as the latest energy efficient boilers and air source heat pumps. Whatever the job, you can rest assured that you are in expert hands.

What we do

  • Plumbers

    • Emergency plumbing services
    • Unvented cylinder installation and maintenance
  • Boiler, central heating and gas engineers

    • Boiler installation
    • Boiler repair
    • Boiler servicing
    • Radiators and central heating
    • Gas safety testing and inspection
  • Renewable energy

    • Air source heat pumps

Customer reviews

Why you can trust these reviews

All reviews are verified as being genuine and a true customer of this trader.

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100% of the reviews we publish have been through our stringent moderation process.

4.9
227 reviews
Customer Service
4.9
Quality
4.9
Value
4.8
Sort by
Confidence in AOS Fully Justified
Customer Service
Quality
Value
We came to AOS via their Service Department, with which we have enjoyed an excellent relationship for the past two years. In January this year our ageing heat pump, as expected, broke down irretrievably, and it was with great confidence that we turned to AOS for its replacement, together with several, more suitable radiators. The preinstallation survey offered clear and useful advice. The quotation was laid out in logical detail, with diagrams, and once accepted was followed by an excellent description of the relationship both parties had a right to expect. We cannot praise the installation team too highly. Well led, and keen to get the job done properly. Everyone knew what needed to be done, worked with a minimum of fuss, and tidied up at the end of the day. It was good to be involved in discussion about the routing of pipes, the siting of electrical boards, switches and cables etc. We became party to a neat, tidy and uncluttered installation, which anticipates the needs of regular servicing, and has greatly improved the space in the airing cupboard. An art installation in its own right! The only glitch in the process was the late deliver of two radiators, which could not be helped. Expeditious resolution was followed by a clear explanation of the mysteries of the system, together with a series of glossy booklets covering every conceivable need for reference. Both encouraging and easy to follow. Our confidence in AOS fully justified.
Customer in Hertfordshire Posted on 29/01/2024 , work completed 26/01/2024
Excellent service
Customer Service
Quality
Value
I have used AOS for over 18 years for maintenance and repair. I had a problem with my boiler. I called and they were there within a few hours. Unfortunately the boiler was not safe and needed to be replaced. I found the guys very helpful and professional. I would highly recommend AOS.
Customer in Hertfordshire Posted on 10/01/2024 , work completed 09/01/2024
a job well done
Customer Service
Quality
Value
We have a maintenance contract with AOS and we needed to call on their service to fix a non critical problem = a tall radiator not fixed correctly. The response was excellent and the technician turned up early - not a problem. He could have done a quick fix but instead did a permanent job and did it thoroughly. He kept us informed and showed us what he had done. Very pleased with this.
Customer in Hertfordshire Posted on 05/01/2024 , work completed 05/01/2024
Excellent professional service throughout!
Customer Service
Quality
Value
AOS have been professional throughout the entire installation of a new Bosch 4000 combi boiler. Shoutout to Lucy for organizing all the relevant paperwork and advising on key points! AOS made good on removing an old system boiler from my kitchen and installing a new combi boiler in the loft space to gain extra space in the kitchen, airing cupboard and loft. All the lads who worked on the job were punctual, professional, and respectful of my property. All pipework has been cleanly and professionally fitted.
Customer in Hertfordshire Posted on 08/12/2023 , work completed 21/08/2023
AOS fitted a new processor for my power shower.
Customer Service
Quality
Value
I have been a customer with AOS for approximately 16 years when I took out a service plan for heating etc. On every single occasion I have telephoned I have been met with professional support staff who listened and organised everything possible to accomodate my needs. All the engineers or technicians that have attended my home are also professional, friendly and incredibly mindful of taking every possible care of my home whilst carrying out their work. Thoroughly recommend AOS and they are a local company that certainly ensures a personal service.
Customer in Hertfordshire Posted on 06/12/2023 , work completed 05/12/2023
AOS Boiler replacement
Customer Service
Quality
Value
We have used AOS to maintain our heating for years and have always found them to be punctual and efficient. The boiler change over was no different. They turned up on time and worked diligently throughout the installation and commissioning of the system clearing up as they went. Very pleased, thank you AOS.
Customer in Hertfordshire Posted on 14/11/2023 , work completed 09/11/2023
Installation of air source heat pump and full central heating system
Customer Service
Quality
Value
I found all the staff to be professional, approachable and friendly. Everything was explained to me and all my questions were answered promptly at all stages. The installers worked hard and did their very best to place the radiators in the places I wanted and made sure that nothing in my home was damaged. The work was carried out on schedule to a high standard. I would certainly recommend them.
Customer in Essex Posted on 13/11/2023 , work completed 10/11/2023
Outstanding Service
Customer Service
Quality
Value
Our old boiler was 18 years old had never gone wrong and was originally fitted by AOS but now was the time to upgrade. We choose a new boiler and had our house surveyed we were really confident with what he told us and went with his recommendation. We needed the boiler to be moved to a different location which was quite tricky but the Gas Fitters were great, were here on the specified day and very punctual and rarely took a break the job was completed on time and all safety checks were completed. I have always had a maintenance contract with them and would highly recommend them for there highly skilled fitters and the excellence of their work.First class Company.
Customer in Hertfordshire Posted on 09/11/2023 , work completed 08/11/2023
Outstanding Service
Customer Service
Quality
Value
Heat pump, cylinder and new radiators fitted. AOS have kept us informed all the way through the recent installation. They have been extremely knowledgeable and able to give clear recommendations without making us feel pressured into making decisions. From first meeting them we have felt confident in their ability to deliver to our needs and also that they understand the product. AOS have handled all of the paperwork for the government grant and we have been kept informed. All of the workforce that we have encountered have been polite, knowledgeable and keen to ensure our satisfaction with the work. I cannot recommend them highly enough for anyone considering a heat pump.
Customer in Cambridgeshire Posted on 07/11/2023 , work completed 06/11/2023
Happy customer
Customer Service
Quality
Value
The person who came to give us the quote assessed what we needed but explained the alternatives. I was confident with his experience. A new central heating boiler was installed, completed on time and to the original agreed price. There was very little disruption and the installers cleaned up after themselves. They were efficient and respectful. Buying a new boiler is a mine field but AOS made it easy
Customer in Hertfordshire Posted on 30/10/2023 , work completed 26/10/2023