N4 Gas Ltd

I’ve been using N4 gas for years. They are always so quick to respond and keen to help and Chris is exceptional. He found a fault with the installation of my boiler which meant it kept breaking down and worked creatively to rapidly rectify it. He services the boiler so thoroughly each year and is upbeat and interesting with it. Thanks so much Chris!

Called out for a repair on my Vaillant Eco Tec plus combi Boiler. Initially a faulty pump was diagnosed as the Problem. The pump was replaced but problem still remained. I was then informed that the problem was down to a blocked heat exchanger. After numerous visits and unnecessary extra costs, my Boiler is now working. I would strongly recommend to avoid using N4 Gas

We were having issues with our boiler not supplying hot water so we were quite desperate to get it fixed. N4 Gas had been recommended so we asked them to come inspect the boiler since we couldn't figure out what was wrong with it. They said we'd have to wait a few weeks for someone to come out but since they had been recommended we waited... when the engineer came to inspect he never figured out what was wrong and semi-suggested we'd need a new boiler. From then the communication and contact with the company was a mess, no one would answer our queries or requests, we even said we'd like to go ahead with the boiler replacement and they never responded... they sent me the wrong invoice and when I asked them to update the information it took them a whole month to resend it. I'm glad I got a second opinion because it turend out to be a really easy fix. They need to work on their customer service and inspection skills.

N4 Gas have installed our replacement boiler during a kitchen refit in 2014, and have been out go to plumbers since. They are masters of taking on difficult jobs, which is especially true of servicing our boiler where it’s right at the back of a utility cupboard space, where the walls were built around the original boiler after it’s install in 2004. We continued to use them for our Annual Boiler service until 2022, but swapped to a Vaillant aroTHERM plus 5kWh Air Source Heat Pump in 2023. We do however continue to recommend N4 Gas to others in the area, yet to make the Heat Pump switch.

One word. Exceptional. We noticed a leak in our loft and were told by the insurance company the boiler was beyond repair. We sourced quotes from 3 national companies and were fed up with the hard sell and forced additional extras that we would be forced to purchase despite not needing them. We contacted N4 after hearing brilliant reviews from neighbours and their response was prompt, their pricing extremely competitive and transparent. Within 48 we had a site visit, a quote that was clear and concise and an extremely good timeframe for work to be completed. Even with our boiler in the loft David and his team quickly and cleanly removed our old boiler, installed the new one, undertook the necessary safety check and very kindly fixed an issue with a radiator within 5 hours. We were extremely happy with the correspondence and the courtesy follow-up visit. I would highly recommend them for all-around exceptional service!

Great reponse from N4 Gas, responded to a gas leak from my hob and was here within the hour! Highly recommended and great to find such a quick turnaround in London, I live in the Old Street area and am able to cook and have a hot shower again :) 5 stars! *****

The team are brilliant. Respond really quickly, really nice people. They explain everything and they advised us that there was a simple solution to fixing our gas boiler.

I called N4 Gas to deal with an issue with my boiler producing hot water but not heating the house. I chose them as they were local, and on the manufacturer's list. The engineer (Dan) that attended quickly identified the problem, and a work around ahead of a proper repair being made. He also identified an unrelated (and quite simple) issue that the previous company that serviced the boiler had not spotted. The repair required replacement of 2 actuators - the work was carried out quickly and professionally. When one of the actuators subsequently proved to be not functioning correctly (due to a fault of the device), it was replaced promptly without any issues. N4 gas is a good and professional company to deal with; they care about the work they do and I highly recommend them.

Extremely unprofessional and to be avoided! I booked this company to do boiler replacement. I selected the as they are based in the same area and I believe in supporting local businesses. I booked the visit to get an assesment and a quote 3 weeks earlier so with plenty of time for them to plan. The engineer did not show up twice (after I already took a day off to wait for him). First time, someone called me (at least) to say he was not coming. Second time, it was just no show and I had to chase him... only to be told that if I do not want to sit around and wait, I should look elsewhere. I asked the person on the call if they were not interested in doing business and that is what he said. "You should look elsewhere" and "I do not care". I wasted more than a month and 1.5 days taking time off work thanks to the lack of professionalism of this company. Hence, unless you have plenty of time for waiting and for repeated no show, do not use this company. There are many other businesses around and already got several swift and proactive responses. PS: the reply from N4 Gas below adds an insult to injury, implying it was somehow my fault that I was not ok with waiting around repeatedly. In my view, if they cannot come for quote purposes twice in a row - that is BEFORE getting money from me, I doubt there will be a quality service once they get a deposit.

Along with another company, we contacted N4 Gas about getting a boiler replaced. N4's engineer came over three days later and confirmed that the current one was beyond repair. Over the course of the next few days, we called them repeatedly about confirming a date and time for the job. They're just around the corner from us and we thought it would be good to use a local company where possible, so we declined the estimate and installation date from the other people who came to look at the boiler and decided to go with N4. Despite assuring me that they would return my calls asking for a confirmed installation date, N4 repeatedly failed to do so. I remained courteous throughout this time – as indeed did they, every time I called to see why my call hadn't been returned. However, you can only give the benefit of the doubt so many times when you've been repeatedly told that someone will try and contact the engineer and get back to you in the next few minutes. Throughout this time, we had no hot water, but we persevered and showed good faith for several days. It was only on the final day that it was explained to us that the difficulty so far in pencilling a date was that this would be a two-person job extending over two days and it was hard to find engineers who were free to do this over consecutive days. At no point prior to that conversation was I told that this was the reason – and I only mention this because rather than being kept in the dark, it's always nice to be told, so that you have some sort of understanding why it's taking so long to confirm a job. In the very final exchange I had with N4 (for which the woman on the line described herself as the third in command, meaning that two of her colleagues tend to field most of the phone enquiries), I asked her to promise me that she would get back to me by the end of the day. That was Monday; I'm writing this on a Wednesday, and we've still heard nothing, so it's just as well that late that Monday, sensing that the writing was on the wall, we called the other company whose estimate we declined, apologised to them and asked them if they were still up for honouring that initial estimate – and they're coming to do the job next week. To anyone at N4, if you really do record all your calls for training purposes, feel free to play them back and tell me if I've been anything other than courteous and patient with you. I have to give a score here. I'm diplomatically going to give three stars because we didn't get as far as actually having our boiler replaced. But this whole experience was a little sad as I really wanted to use a reputable local firm and you made it impossible for me to do so.

Always punctual, and fairly priced.

David came round for an estimate to fit a new boiler. Nice fella who I fully expected capable of doing the job for us. Then he completely ghosted us - quote never arrived, he or anyone at N4 did not reply to texts, phone messages or emails. Not really one for leaving reviews but I find this so unprofessional and just a bad disrespectful way to treat people who are trying to give local businesses work. So beware.

we've used N4 Gas on numerous occasions over 15 years and they have always been professional, honest, timely and courteous. An example - We have had an instance in a rented place where the land lords 'heating specialist' could not work out an issue and we got N4Gas in and they solved the issue. You get what you pay for.

Amazing service from N4 Gas. Very professional and highly knowledgeable of their work

I cannot fault the service we received from N4. Prior to commissioning N4, we had a hatchet job carried out by someone else on our heating and hot water controls and associated wiring, leaving us with no hot water. The only way the heating was working was because the electrician by-passed one of the circuits to force it on! And our faulty twin-channel controller was replaced by a working single-channel controller - hence no hot water. So I rang N4 who had been recommended to me and they sent an engineer (Dan Mitchell) in less than 40 minutes with a new controller in hand. He was extremely professional and explained every step of the way what he was doing, as he tried to unpick the dreadful wiring we had. The upshot is that we had our heating and hot water returned in just over an hour, some functioning controls installed and compliant wiring again! And with a toddler needing constant washing, this was a godsend. So, thank you Dan and N4 for your swift, friendly and professional service. Hugely appreciated!

I had booked a service with N4 Gas for my ageing Potterton boiler. Their service engineer arrived and firstly pointed out that I did not have proper ventilation to outside air . After several checks he stated that the boiler condition was poor with signs of fatigue. We then discussed replacing the boiler and hot water tank and he explained, that with the current regulations, the boiler would have to be re-sited and moving it up into the loft being the best option ( but a big job ). He talked with his office and after taking lots of notes said someone would need to come round to finalize things and I would receive a quote in 2-3 days. He also put a 'danger do not use ' sticker on the boiler, pointing out this was a urgent matter. I did not receive a call back from them and finally I received a quote 6 weeks later ( so not a urgent matter to them ). The quote itself was not detailed or fully explanatory. I would have expected someone to get in touch to discuss the quote. I can only assume that either the job was too big or they did not want the business, however it would have been courteous to let me know. Based on my experience of N4 Gas I would not recommend them to anyone.

We wanted to thank Dan Mitchell & the N4 gas team, for such an AMAZING service! It was such a pleasure to meet Dan, He arrived on time, was polite, friendly and did such a great job servicing and testing our boiler and gas appliances.. He made sure that everything was back in its place, keeping everything nice and tidy. We really appreciated the time that he took to make sure that everything was working correctly and the knowledge that he shared about our boiler and future advice. Thanks again Dan for such a fantastic customer service! We will highly recommend you & N4 gas to all our friends and contacts.

Chris from N4 Gas came today and was great. Knew his stuff. Strongly recommend him.

N4 have always solved any issue I have had especially on emergencies. Dave is one of the most competent plumbers I know. Could not rate him and his team highly enough.

These guys are amazing, I have been using them over 16 years and would recommend them to anyone with heating, hot water or air conditioning issues. They are fast, friendly and extremely knowledgeable. It has always been a pleasure to work with them