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Endorsed by Which? Trusted Traders

AOS Energy Efficient Heating Systems Limited

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4.9

187 Reviews

Opening Hours
Today -
  • 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

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

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

4.9
187 reviews
Customer Service
4.9
Quality
4.9
Value
4.8
Sort by
Excellent service throughout
Customer Service
Quality
Value
We have wanted to install an air source heat pump (ASHP) for several months following the sharp rise in our forecast energy costs (we had both gas and electricity costs). Having looked around for companies in our area (south-east) we decided to go with AOS because of the consistently good reviews they had received. We were not disappointed. Every aspect of their work was utterly professional - Ryan and his installation team were punctual (waiting outside to start work before 8am every day), polite and courteous, and very hard-working, especially given the very hot days we had whilst they were here. Also, their workmanship was top class. I'm not a plumber or heating engineer but the finished installation, both the outside ASHP and the indoor cylinder (in loft) were so neatly laid out and finished off, as were the five new radiators we chose to have to improve the performance of the overall system. The workings and control of the heat pump were explained to us, and everything seems to have been working well since the commissioning date. A word also for the engineer (Lee Wildego) who carried out a very detailed survey of out property prior to the installation team's arrival, and to Charlotte and Lucy at AOS for always being so helpful with my endless questions and queries. Overall, I would recommend AOS without any hesitation.
Customer in Hertfordshire Posted on 09/08/2022 , work completed 04/08/2022
Good Service and communications
Customer Service
Quality
Value
We already use AOS for our Heating and Boiler Service plan and have always been pleased with their work and so we were happy to use them to install a new boiler to replace our previous one. The estimater gave us a clear idea of what we needed and what work was to be done. The Estimate was competitive. The work was carried out on the agreed date efficiently and we were left with clear instructions how to use the new boiler and the Hive controller. We would recommend AOS to anyone else needing a new boiler.
Customer in Greater London Posted on 03/08/2022 , work completed 25/07/2022
Great installation job - really neat, tidy and effective
Customer Service
Quality
Value
This is the second time that I've used AOS Heating. They installed a 14kW Mitsubishi Ecodan ASHP in our previous house four years ago, which drastically reduced our heating bills. We just done this again in our new house and are very pleased with the installation. The pipework and electrics have been so neatly done. Very helpful and polite team of installers. If we move house again, I'll use them again, no hesitation.
Customer in Cambridgeshire Posted on 02/08/2022 , work completed 28/07/2022
Efficient and effective service throughout
Customer Service
Quality
Value
AOS provided an efficient and effective service from start to finish exceeding our expectations. The surveyor provided sound advice and guidance making us aware of the system requirements. The installation team were prompt, professional, polite and helpful whilst Charlotte and Lucy in the office kept us fully informed and steered us through all the paperwork. I have no hesitation recommending this company.
Customer in Bedford Posted on 12/07/2022 , work completed 08/07/2022
Excellent service
Customer Service
Quality
Value
I’ve had heating cover from AOS for a few years after bad experiences with BG. In contrast, AOS doesn’t try and condemn your boiler each year and their engineers come on time, are tidy and do what they say they will. There was a real test a few days ago for them. Just before a Bank Holiday, the hot water stopped working and I saw a leak near the boiler. The phone was answered by super-efficient Abbie who was rapidly able to ascertain what the problem was and arrange an engineer visit the next day. I don’t usually buy extended warranties or maintenance plans but I wouldn’t be without AOS cover and am sure they apply the same standards to one-off jobs.
Customer in Essex Posted on 16/06/2022 , work completed 01/06/2022
Work at 91 Cowper Crescent
Customer Service
Quality
Value
The initial callout, not an emergency was completed very much to our satisfaction within 3 hours, from this a recommendation was made by the engineer to make a modification , to eliminate the problem occurring again. This work was carried out at the date and time agreed, once again to our satisfaction. All this work was carried out under our maintenance contract. This a can do firm and has been for the last 20 years to my knowledge
Customer in Hertfordshire Posted on 12/05/2022 , work completed 12/05/2022
Air Source Heatpump installation
Customer Service
Quality
Value
Having moved to an old house with a very old oil boiler we were delighted to be recommended AOS by friend of a friend as a solution to heating the house. Had it not been for them we would have doubted that such a system would be possible for the house, albeit we were comprehensively upgrading and renovating. From the outset, the company was courteous, and prompt and answered the many queries that arose from the planning stage to the final commissioning. They liaised with our plumber and electrician to ensure the installation was as seamless as possible. In addition, they helped overcome supply problems to ensure the system was installed so that we could take advantage of the government Renewable Heat Incentive deal that was closing at the end of March 22. So far so good, but as energy prices rise, it is a system that one needs to get to understand, with its multiple thermostats and timing options.
Customer in Hertfordshire Posted on 20/04/2022 , work completed 17/12/2021
Air Source Heat Pump installation
Customer Service
Quality
Value
Everyone in AOS from start to finish were very helpful, willing to discuss and answer all my questions politely and patiently, and the process went completely to plan. The team of young guys were always punctual, polite, worked competently and knowledgeably. I was very pleasantly impressed to see such a young team doing such complicated and responsible work completely confidently. The pump is now installed and is working as it should be. I am very pleased with the whole installation process and felt I was in good hands the whole time. I had solar panels installed earlier to help with the running cost of the pump.
Customer in Cambridgeshire Posted on 10/04/2022 , work completed 07/04/2022
Top class service
Customer Service
Quality
Value
Aos have always given me great service over the many years I have used them. I had a combi boiler installed 5+6 April and am very pleased with the work done. Would recommend AOS to anyone
Customer in Greater London Posted on 08/04/2022 , work completed 06/04/2022
Never Disappointed
Customer Service
Quality
Value
We have been a long term customer of AOS and always happy with their service. When our old boiler reached its end-of-life, (supplied and installed by AOS nearly 20 years ago), AOS provided a competitive quote for a replacement, offered an installation date within a few days, arrived on time, carried out a nice neat installation, tested and talked us through the new boiler operation. Engineers always very personable and ready to answer questions and listen to any concerns.
Customer in Hertfordshire Posted on 06/04/2022 , work completed 01/04/2022