Endorsed by Which?

AOS Energy Efficient Heating Systems Limited

4.9

232 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

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4.9
232 reviews
Customer Service
4.9
Quality
4.9
Value
4.8
Sort by
Reliable, tidy and professional
Customer Service
Quality
Value
We have had an air source heat pump installed by AOS and they have done a great job. A polite team of up to six operatives who were tidy, hard working and professional. The pre-sales service was excellent too with regular communication as to what was going on and when things would happen. Happy to recommend them.
Customer in Hertfordshire Posted on 08/04/2024 , work completed 28/03/2024
AOS Heating Systems replaced my oil boiler central heating system for an Air Source Heat Pump including all radiators and hot water tank. system.
Customer Service
Quality
Value
A leaflet through my door from AOS Heating Systems resulted in a presentation on air source heat pumps and their advantages. This led to a 1 to 1 at home assessment. We had a 25 year old oil fired boiler feeding 40 year old radiators and decided now was the time to change. We went for the full system heat pump, new radiators throughout and replacement hot water tank. The installation took 5 days as predicted. The engineers were polite, totally professional arriving on time and cleaned up after themselves each day. There were some issues, the hot water tank, supplied by a sub-contractor was delivered late. However, AOS took complete responsibility. We were kept informed and pragmatic graceful solutions proposed and successfully implemented to keep the plan on track. We are delighted with the result. The heat pump itself is significant quieter (almost silent) than the oil fired boiler and although there is a little more humming from the system, as it is pumping water around the house, it is much quieter than the clicks and groans from the old system. Counter intuitively, the radiators are not as hot, but the house is definitely warmer than before. We have just booked our after sales health check to ensure we are fully familiar with our new system and using it as efficiently and effectively as possible. All in all, as a decerning engineer, I can say this was a major household change, managed really well by a totally professional team. I have no hesitation in recommending them.
Customer in Central Bedfordshire Posted on 04/04/2024 , work completed 22/03/2024
Efficient Professional Work
Customer Service
Quality
Value
Have had good work carried out by AOS for well over 10 years. Air Source Heat Pump ( ASHP) Installed 17 July 2013 replacing oil fired system. Basically AOS Serviced system and the pump failed (wore out) on 23 January 2024 two days later survey carried out to assess what was required and two weeks after that a new ASHP was installed and upgrades on two small radiators. The work took two days and the ASHP was working. We are happy with new pump and pipe work and we were able to keep in touch with engineers at all times the wifi work was completed on the 5th March 2024. Overall costs ASHP pipework, filters, pumps, radiators and disposal of old parts and pumps reasonable (no incentives as we were just replacing the pump unit and we had our government incentive the first time round)
Customer in Buckinghamshire Posted on 11/03/2024 , work completed 05/03/2024
Considerate & thorough engineers
Customer Service
Quality
Value
We had our boiler replaced and a system flush and the two engineers were excellent. Nothing was too much trouble and they were really considerate in how they left the house and tidied up after themselves. They even did a few bits that they noticed when they were there and we are really pleased with the final result.
Customer in Hertfordshire Posted on 09/03/2024 , work completed 05/03/2024
New Boiler Installation
Customer Service
Quality
Value
We chose AOS Heating to carry out our new boiler installation as we have used them for many years to service our old boiler and have been very happy with the level of service we have received. We had a technical surveyor come out and do a survey and offer advice regarding the options available to us. The office team were always very efficient and keeping us updated by phone or email. We were provided with very detailed quotes and finance options. The two engineers that installed the boiler were very prompt and polite. They used dust sheets which we were very pleased about as we have cream carpets. They kept us updated throughout the installation. On completion of the work, I was given a full overview of all the workings of the boiler. AOS Heating also have a 24 Emergency phoneline which is very reassuring as a customer. We have been delighted with the service we have received and wouldn't hesitate to recommend AOS Heating to potential customers.
Customer in Hertfordshire Posted on 25/02/2024 , work completed 02/11/2023
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