Control Flow visited our property after we received a letter, and they were very helpful and let us know what was happening during every step of the way. They were extremely friendly and made us feel... See more
Company replied
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We did not receive prior notification from United Utilities when an employee from ControlFlow turned saying we were using more water than we should be - we are fairly typical - and hustled their way o... See more
Company replied
Great experience. The team were friendly and professional and explained everything that was happening and why. It was completely free, so I’m looking forward to seeing results!
Company replied
I did receive an email regarding having a water test on my property. I assumed this would be optional ? I do appreciate you are trying to help. But I was disappointed when one of your employees ca... See more
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Company details
Written by the company
At Control Flow Technologies Group, we help customers and organisations save water, energy, and money with our patented HL2024® technology. With our Control Flow HL2024® devices, we deliver a fully tailored, turnkey service that tackles some of the UK’s most pressing challenges: water scarcity, rising utility costs, and nutrient neutrality. We work with the UK's major water companies to deliver free Water Audits to customers, helping them save water and money on their utility bills.
Contact info
Unit 1C Hylton Park, SR5 3HD, Sunderland, United Kingdom
- 0800 783 7007
- watersaving@controlflow.co.uk
- controlflow.co.uk
3.4
Average
38 reviews
Replied to 60% of negative reviews
Typically replies within 1 month
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See how their reviews and ratings are sourced, scored, and moderated.
Great experience.
Great experience.
The team were friendly and professional and explained everything that was happening and why.
It was completely free, so I’m looking forward to seeing results!
May 29, 2026
Unprompted review
Reply from Control Flow Technologies Group Ltd
Hi Jack,
We really appreciate taking the time to leave a review. We are so pleased you were happy with your service!
Misleading sales tactics
Misleading sales tactics. We were informed that there appeared to be a water leak on our premises due to increased water usage, and that the company was working alongside United Utilities to help identify the issue.
After requesting further information, I received an email which turned out to be a general water audit offering advice on reducing water usage and saving money, rather than any formal notification regarding a suspected leak.
I felt this approach was misleading. The sales representative’s communication did not accurately reflect the purpose of the contact and was not an appropriate way to promote the company’s services. A more transparent and honest approach would have been appreciated.
May 28, 2026
Unprompted review
Reply from Control Flow Technologies Group Ltd
Hi Andrea,
Thank you for taking the time to share your feedback. We're sorry to hear that your experience left you feeling misled.
We work in partnership with United Utilities to offer customers free water audits, which are designed to help identify opportunities to save water, reduce bills, and, where leaks are found, arrange for these to be repaired at no cost to the customer. As part of this service, higher-than-expected water usage may sometimes indicate a potential leak, which is why a water audit may be recommended.
We understand your concerns regarding how this was communicated and appreciate your comments. We aim to ensure that the purpose of our visits and services is explained clearly and transparently at all times.
We would welcome the opportunity to look into your experience further. Please contact our team directly with your details so that we can investigate the circumstances surrounding your interaction and address any concerns you may have: watersaving@controlflow.co.uk.
Great company and communication.
May 22, 2026
Unprompted review
Reply from Control Flow Technologies Group Ltd
Hi Shaun,
Thanks so much for taking the time to leave a review. We are so pleased you were happy with your experience.
We did not receive prior notification…
We did not receive prior notification from United Utilities when an employee from ControlFlow turned saying we were using more water than we should be - we are fairly typical - and hustled their way on to our property, claiming to be from the utility to do our free water audit. We felt put on the spot and under pressure, including being made to sign something - we aren’t sure what - that we now suspect includes having flow control devices that we don’t want or need. Very unhappy with what appears to be high pressure sales.
May 26, 2026
Unprompted review
Reply from Control Flow Technologies Group Ltd
Hi John,
Thank you for your feedback. We’re sorry to hear that your experience left you feeling uncomfortable and under pressure.
Customers should always receive communication either from us or United Utilities before any visit takes place, so we are concerned to hear that this may not have happened in your case. We take comments like yours seriously and would like the opportunity to investigate what occurred.
A member of our team will be in touch directly to look into this further, understand the circumstances surrounding the visit, and work with you to resolve any concerns.
Control Flow visited our property after…
Control Flow visited our property after we received a letter, and they were very helpful and let us know what was happening during every step of the way.
They were extremely friendly and made us feel very comfortable! I can’t wait to see some potential savings on my utility bills!
May 27, 2026
Unprompted review
Reply from Control Flow Technologies Group Ltd
Hi Nicola,
Thank you so much for leaving this kind review. We are so pleased you were happy with your service and look forward to hearing about your savings!
Easy and quick process all done for…
Easy and quick process all done for free through my water company. Lovely plumber too!
May 14, 2026
Unprompted review
Reply from Control Flow Technologies Group Ltd
Hi Lewis,
Thanks so much for taking the time to write this review. We are so pleased that you were happy with your experience and we hope you see some great savings soon!
Coming to properties Unannounced!
I did receive an email regarding having a water test on my property. I assumed this would be optional ? I do appreciate you are trying to help. But I was disappointed when one of your employees came to my property on a Sunday which was a Bank Holiday. Unannounced!
I felt put on the spot a bit and harassed.
I did not request an appointment.
May 3, 2026
Unprompted review
Reply from Control Flow Technologies Group Ltd
Hi Neil,
Thank you for your feedback, and we are very sorry for the experience you had.
We do have auditors who visit properties to offer customers the opportunity to take up a free water audit service; however, this service is completely optional and not compulsory in any way.
We are very sorry that this left you feeling uncomfortable or pressured, as this was never our intention. As discussed when we contacted you directly, we appreciated the opportunity to address your concerns and hope we were able to resolve the matter for you. We can also confirm that your details have now been removed from all future communications regarding this service.
Really happy with the product and my…
Really happy with the product and my plumber was super informative and helpful. Considering this was a free appointment it was a no brainer!
March 21, 2026
Unprompted review
Reply from Control Flow Technologies Group Ltd
Hi Millie,
Thank you so much for taking the time to leave your kind review and we are so pleased that you are happy with the service we provided.
Great service!
Great service! Very friendly & patient. Thank you very much.
March 17, 2026
Unprompted review
Reply from Control Flow Technologies Group Ltd
Hi Em,
Thank you so much for taking the time to leave this review. We are so glad you had a great experience with us.
Overall great experience!
Overall great experience!
Had a survey carried out to see how Control Flow could help with my water usage.
Very polite and informative during the initial survey.
A plumber was booked for a few days after to install a water saving device to my water meter.
The Plumber arrived and was very professional, courteous and the installation was seamless.
If you want help with your water usage get in touch with Control Flow who are experts in what they do.
February 25, 2026
Unprompted review
Reply from Control Flow Technologies Group Ltd
Hi Amy,
Thank you so much for leaving this lovely review. We are so pleased you were happy with your service and our plumber impressed you and can't wait to see you start saving on your bills!
Really happy with the service
Really happy with the service, thanks so much!
February 25, 2026
Unprompted review
Reply from Control Flow Technologies Group Ltd
Hi Tom,
We really appreciate you taking your time to leave us a review. We are so glad you were happy with your service.
Fantastic!!!
What a brilliant service, the operative I spoke to was patient kind and considerate to all my queries.
Will definitely use a again
March 4, 2026
Unprompted review
Reply from Control Flow Technologies Group Ltd
Hi Antonia,
Thanks so much for taking your time to leave a review. We are so please you were happy with your experience with us!
I was contacted by my water company for…
I was contacted by my water company for this free audit and it was so quick! Really recommend
February 2, 2026
Unprompted review
Reply from Control Flow Technologies Group Ltd
Hi Angel,
Thank you so much for your review. We are so pleased to hear about your experience with us!
Would definitely recommend
I would highly recommend! Brilliant service, super fast appointment and our plumber was so nice.
January 9, 2026
Unprompted review
Reply from Control Flow Technologies Group Ltd
Hi Jake,
Thanks so much for your review and we are so pleased to hear about your experience with us.
Couldn’t recommend this service more
Couldn’t recommend this service more. I got this free through my water company and I have noticed no difference to my water pressure at all, but hopefully will see a difference in my bills soon! Really nice plumber too.
February 18, 2026
Unprompted review
Reply from Control Flow Technologies Group Ltd
Hi Hollie and Sam,
Thank you so much for your lovely review - it means a lot to our team to know you had a good experience with us. We can't wait for you to see your savings soon!
Turned up unannounced saying here to…
Turned up unannounced saying here to fit device on water meter. Had had no prior information and kept talking at me. I ended up letting him in and he did something to my taps. I was trying to wfh at the time and felt completely derailed. I told him that I needed to think about things and he gave me a qr code to scan.
Not surprised to see such a low trust pilot score.
I'm actually fuming now as we have a trading standards sticker on the door saying no cold callers which he completely ignored. Having a name badge does not exempt you from being a cold caller if you don't have an appointment. Even if they saved me £1000 on my bill I don't want this company anywhere near me.
February 23, 2026
Unprompted review
Reply from Control Flow Technologies Group Ltd
Hi there,
We are very sorry about your recent experience with us, this is not the service we aim to provide to our customers.
We work directly with many of the UK water companies, and your water company will be someone we work with. As part of this project, the goal is to help customers save on their utility bills by having a Water Audit carried out and potentially installing a water-saving device for free (as this is funded by your water company).
Our auditors are trained to visit properties to offer this free service; however, you should also have received a letter or email from us prior to any visit.
Your details were provided to us by United Utilities, as they identified that your property may benefit from one of our water-saving devices as part of their water efficiency programme.
This service is completely optional, and you do not need to go ahead with it, and we are very sorry if you were made to feel pressured. If you could contact us directly with more information, we will look into this to ensure it does not happen again.
Email: watersaving@controlflow.co.uk
Phone: 0800 783 7007
Great product and service. Recommended
"I recently had a free water audit carried out after receiving an email from my water company. It explained this could help me save on my bills so I thought why not. The appointment was super quick and easy, and I did have a water-saving device installed by a very friendly plumber. I couldn't recommend this service highly enough
January 30, 2026
Unprompted review
Reply from Control Flow Technologies Group Ltd
Hi Debbie,
Thank you for taking the time to leave such a lovely review. It means a lot to our team to know we made a positive difference, and we can't wait for you to see the benefits of our device at your property!
Great experience
Great service. Control Flow person named Shaun arrived on time, was helpful explaining everything then checked for leaks and fixed a dripping tap in our downstairs toilet. He installed the water saving device in less than 45 minutes. Looking forward to seeing the reduction in our water bill.
February 18, 2026
Unprompted review
Reply from Control Flow Technologies Group Ltd
Hi Edward,
Thank you for your kind review. We’re pleased to hear Shaun provided clear explanations and completed the installation efficiently.
We really appreciate your feedback!
Two guys knocked on the door saying…
Two guys knocked on the door saying they were from United Utilities, my house had been flagged as high water usage and they needed to come in and take a meter reading. The meter had been read a few days ago, my water usage is as low as it's possible to get, the guys were in unbranded high viz. I sent them on their way, to be told I should let them in next time. Called United Utilities. They hadn't sent them. So called police who conducted enquiries and tracked them to this company. They had my name, data breach, and lied through their teeth to try to enter my home. GMP are aware and United Utilities will be getting complaints.
January 27, 2026
Unprompted review
Reply from Control Flow Technologies Group Ltd
Hi Paul,
Thank you for bringing this to our attention. We are very sorry for your experience. Our aim is to make all of our customers feel comfortable when we visit a property, and we want to make this right.
We work directly with many of the UK water companies, and United Utilities are one of our partners. As part of this project, the goal is to help customers save on their utility bills by having a Water Audit carried out and potentially installing a water-saving device for free (as this is funded by your water company).
We are sorry that you were subsequently advised that the visit had not been arranged by United Utilities. We understand how confusing and concerning that must have been. We can assure you that we do undertake authorised work in partnership with them.
We would also like to reassure you that we do not access or obtain customer information unlawfully. Our teams are expected to always carry identification and clearly explain who they are, who they are working on behalf of, and the purpose of their visit. We also fully respect that no one is ever obliged to allow entry if they feel unsure.
We are reviewing this matter internally to understand exactly what happened in your case, as this does not reflect the standard we expect. Your feedback is extremely important in helping us improve.
If you are able to contact us directly with any further information, we will look into this as a priority.
Email: watersaving@controlflow.co.uk
Phone: 0800 783 7007
A ' NO SHOW ' by Control Flow
Like the previous poster I've had a similar experience with Control Flow failing to attend an appointment. Utterly disgraceful. No call, text or email of apology - nout!
I arranged the appointment on the phone and was informed that 'someone' would be visiting my property between 9am - 1pm today 28th/ 01/26.
I've waited in all morning only to hear NOTHING! At least Cenergist turned up last time.
United Utlities will need to sit down and check the integrity of the companies they are recommending. Someone in high office hasn't done their homework- please monitor the failed appointments or as in my case the 'No Show.'
United Utilities may want customers to save water but customers need to save time aswell. I've wasted 4 hours this morning. Unprofessional and 'casual' to say the least.
January 28, 2026
Unprompted review
Reply from Control Flow Technologies Group Ltd
Hi Marian,
We’re really sorry that we missed your original appointment, we completely understand how frustrating and inconvenient that must have been. We will be looking into this further, as this not the level of service we aim to provide for our customers and want to fix this for you immediately.
We would love to rearrange your appointment and book you in on a date and time that is convenient to you, if you still wish to go ahead with it. Could you please let us know your contact details, and one of our team will contact you ASAP.
You can also contact us directly by email (watersaving@controlflow.co.uk) or call us on 0800 783 7007, and we will help sort this.
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