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Endorsed by Which? Trusted Traders

AOS Energy Efficient Heating Systems Limited

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4.8

167 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

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
    • Biomass
    • Solar panels
    • Solar water heating

Customer reviews

Why you can trust these reviews

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

How can we be so sure?

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

4.8
167 reviews
Customer Service
4.9
Quality
4.9
Value
4.7
Sort by
Excellent local company
Customer Service
Quality
Value
I have been with this company for the past four years. They installed my boiler hassle free and good value for money. Excellent service and AOS have continued to provide after sales support. If any issues arise they always provide prompt efficient service. First rate company who I cannot fault in any way.
Customer in Hertfordshire Posted on 08/01/2022 , work completed 08/01/2022
Excellent work and highly trustworthy and competent team
Customer Service
Quality
Value
I wanted to replace a boiler with an air source heat pump system. I sought several quotes and weighed up the balance of quality and cost before ultimately going with AOS. This involved installing an Ecodan heat pump, new radiators, a pressurised hot water cylinder, and also replacing a huge amount of the plumbing. I could not be happier with the decision. AOS' engineers (including Lee Wildego) were all excellent, as were the team online (including Charlotte Owen). They were thoughtful and kind, and never patronising about questions. They were thorough and careful. They accommodated a variety of requests wherever they could manage it (including removing a heavy item from the loft and installing a new shower). When the work was done, they left the house in excellent condition. They arranged a follow up check at around a month, which was also excellent. Appropriate covid measures were followed where required. The experience from start to finish was reassuring and highly competent. I would not hesitate for a moment to recommend all members of this team.
Customer in Greater London Posted on 14/12/2021 , work completed 06/09/2021
New boiler project
Customer Service
Quality
Value
Everything about the project to replace my old back boiler was excellent. Lee talked us through how we might execute the installation where other companies has just shrugged and said it would be difficult. Patiently explored different options ofr location and pipe runs without just opting for the easiest. Fitting team of (Different) Lee and Brad were extremeley professional, did a very neat job of the installation and most importantly were very respectful of our home. The team was also flexible in that we changed one of the rad specs late in the day but they were very accomodating. I started out a little trepidatious about getting a new installation but am now convinced we did the right thing. Could we have got this done cheaper? I dont know but for the care and professionalism I think we got very good value for money.
Customer in Hertfordshire Posted on 24/11/2021 , work completed 18/11/2021
Replacement boiler and heating system.
Customer Service
Quality
Value
After seeing my neighbour having AOS Heating to replace his boiler and seeing there workmanship I decided to request a quote. The surveyor was very helpful explaining the different options available. The quote was itemised covering every detail. I agreed the quote and the office staff contacted me for a convenient 2 day slot. Lee and apprentice Sam arrived at 8 am and cracked on removing all the old system having first laid down mats and sheets to protect the stairs and floors, I was amazed how much they got done on the first day. The whole job was completed by the 2nd day afternoon, tested, made good etc. Home was left clean and heating and hot water all working satisfactory. I would thoroughly recommend AOS Heating.
Customer in Hertfordshire Posted on 16/11/2021 , work completed 10/11/2021
Thoroughly Professional Job
Customer Service
Quality
Value
AOS replaced our oil-fired boiler with a heat pump in October 2021. At our request, they also replaced most of the radiators and installed a full set of thermostatic radiator valves. The process from initial discussions to completed installation took nearly four months, but part of this delay was caused by the need to obtain a satisfactory EPC certificate so that we could apply for a government grant. AOS were very good at ensuring that we complied with all the relevant regulatory requirements. This was a complex project but it was carried out very efficiently. Their staff were always courteous and helpful, and during the installation they left the house clean and tidy at the end of each day. We were left with the feeling that this had been a thoroughly professional job. We chose AOS because several of our neighbours had recommended them to us. We would have no hesitation in providing similar recommendations in the future.
Customer in Hertfordshire Posted on 27/10/2021 , work completed 11/06/2021
Excellent service
Customer Service
Quality
Value
We have used AOS for about fifteen years. Recently we had to have the very old water tanks in the loft replaced. Tony and Jack arrived punctually and laid down dust sheets. They worked all day with as little disruption to us as possible. It was good to see Jack, the young man, gaining knowledge and experience, working with Tony, the senior professional. They did an excellent job and left everywhere clean and tidy. All of the staff of AOS that we have encountered over the years have been helpful, efficient and polite. I would not hesitate to recommend the company.
Pearl in Hertfordshire Posted on 12/10/2021 , work completed 29/09/2021
Professional installation of replacement of old gas boiler.
Customer Service
Quality
Value
My gas boiler needed replacing following an annual service check by AOS which highlighted a problem necessitating its replacement. The installation was carried out by Tony Owen and Sam and was planned to be completed in one day. They arrived promptly at the scheduled time and carried out the work efficiently and within the timescale. They ensured that my property was protected with dust covers where ever they had to work ensuring that the materials were located without hindrance to me. At the end of their work, Tony explained to me what they had done during the installation, highlighting a small electrical problem which meant a further return visit to resolve at a later date. He went through the documentation he left with me. Sam was very courteous when wishing to use some cleaning facilities to assist him in tidying up before they finished to leave. Altogether, very professional and efficient work carried out by AOS and would highly recommend them.
Customer in Hertfordshire Posted on 24/09/2021 , work completed 24/09/2021
Installation of and air sourced heating pump, etc
Customer Service
Quality
Value
We used AOS Heating who are based in Cheshunt. We arrived at a quote that we agreed on and which was kept to. The installers arrived when they said they would, 8.00 am, worked all day except for a 20-minute lunch and left between 4.00 and 4.30 pm. They agreed with us what would happen were as new radiators had to be installed as well as the pump, piping and a new immersion tank. They worked cleanly vacuum cleaning at the end of each day. The work was completed on time. The men who came were polite and pleasant company when we chatted to them.
Customer in Hertfordshire Posted on 09/09/2021 , work completed 26/08/2021
New gas boiler
Customer Service
Quality
Value
1st classwork from AOS in installing our new gas boiler, Tom, Kian & Jack provided excellent work throughout keeping me informed of everything that was happening as they went. Would definitely recommend AOS for anyone needing a new boiler.
John in Hertfordshire Posted on 25/08/2021 , work completed 12/08/2021
Air Source Heat Pump Installation
Customer Service
Quality
Value
AOS did everything as expected with all staff extremely helpful and friendly and the attention to detail was very good.
Richard in Hertfordshire Posted on 06/08/2021 , work completed 05/08/2021