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Part of A/S OSO, the largest water heater manufacturer in Norway, OSO Hotwater UK is the company’s British arm and provides customers throughout the UK with access to OSO’s wide range of hot water heater models. OSO water heaters run the gamut from unvented models to specialty solar-powered options for those who want to make their home greener. The company also guarantees their cylinders to last up to 25 years, provided they are professionally serviced every year. At EasyFlow, we provide OSO unvented water heater repairs and annual service to customers throughout Manchester, Liverpool and Leeds.
OSO Hotwater UK has become one of the primary suppliers of hot water heaters to homes and businesses throughout the UK, offering a range of models to suit different usage needs and installation requirements. The company’s OSO Super S line includes units with capacities ranging from 120 litres to 300 litres. They also manufacture a Slimline model, as well as a super-compact under-sink model designed for commercial use with sinks that are not tied to the main hot water lines. Notably, the Slimline RD150 is the slimmest domestic cylinder on the market in the UK, and capable of being installed in some of the tightest spaces imaginable.
The Super S line of hot water heaters are available in both direct and indirect (gas) versions, but both are unvented, meaning that they rely on pressure created during the heating of water to supply hot water to the taps, rather than mains pressure as with a thermal store hot water heater or a conventional gravity feed system.
While OSO Hotwater UK is regarded as a pioneer in the industry, as well as one of the greenest hot water heater manufacturers in the world, the fact remains that their products are not trouble-free. As they age, they are subject to experiencing a number of faults. While some of these can be diagnosed and even repaired by the average homeowner, others cannot, and some are dangerous to attempt. We have listed some of the most common faults for OSO unvented water heaters below.
No Hot Water: If the unit is not heating water, there could be a number of problems. The most common issue is that the safety cut-out has been activated because an immersion heater thermostat or tank thermostat has failed. It is also possible that the thermostat is set too high, and the temperature tripped the cut-out feature. Homeowners can attempt to reset the cut-out with the manual reset button within the electrical box. However, if the fault persists, an EasyFlow technician will need to service the unit.
Hot Water Discharge in the Tundish: If very hot water is being discharged through the tundish, it is a sign that something is wrong. It is possible that the pressure relief valve has malfunctioned, but it could also be a problem with the thermostat or with the thermal cut-out. Homeowners should immediately isolate the unit from the power supply and call EasyFlow for service.
Intermittent Discharge through the Tundish: If you are noticing a slow or intermittent discharge of warm or cold water into the tundish (but not very hot water), the most likely culprit is the expansion vessel. If the expansion vessel loses its pressure, the system will periodically discharge water. The vessel must be recharged to 3.5 bar to alleviate the problem. An EasyFlow technician can handle this service quickly.
No Water from the Hot Taps: If you open the hot tap and no water comes out, it means either there is a blockage at the mains, which is unlikely, or the hot water heater’s strainer has become blocked. The strainer will need to be removed and cleaned to restore water flow to the hot water taps.
At EasyFlow, we specialise in servicing a broad range of hot water heaters, including models from OSO Hotwater UK. Whether you’re experiencing intermittent discharge, no hot water or something completely different, one of our experienced technicians can help.
If you need assistance with any hot water heater repairs, to schedule hot water heater maintenance, or to install a new hot water heater, call EasyFlow at 0800 433 4043
Our maintenance plans are designed to ensure our customers enjoy peace of mind, and constant hot water. We keep your hot water flowing while minimising your costs and eliminating stress. Let our experts identify and correct water heater faults, while you enjoy low monthly payments.
Thank you very much for the quick and excellent service
Colin, Liverpool
12th July, 2022
Replacement Valves
Just a word of thanks for the emergency support and repair carried out this week. Once again the work was carried out expertly, without leaving any mess and with great courtesy. Well done and thanks again for the support in our hour of need, much appreciated. Regards
BRH, Manchester
10th January, 2022
No Hot Water
Really appreciated the immediate answer when I phoned on Tuesday, which was a Public Holiday, about a significant leak in our pressurised hot water system. Really appreciated the quick call back to discuss the emergency situation and for the repair carried out by him on Tuesday this week. Once again the work was carried out expertly, without leaving any mess and with great courtesy. An excellent service. Well done and thanks again for the excellent support in our hour of need; much appreciated.
Brian, Styal Road Wilmslow
28th December, 2021
Maintenance Plan
After a few years of struggling to get adequate hot water our landlord finally brought in the right people for the job. Chris our engineer was superb, after a brief chat with myself he diagnosed & repaired the issue in under two hours. Excellent service & very professional. Thanks to you we now have plenty of hot water 24/7.
Chris Sheridan, Manchester
23th March, 2021
Blending Valve Replacement
After having a bad experience with a Company pretending to be local who pretty much ripped me off, I was glad to find Easy Flow were local and the service from start to finish was excellent. Got a call back within ten minutes and was promised someone would be round to review that evening and then complete the job a couple of days later if needed. Chris, who attended texted me to give me an ETA and arrived when promised, masked up and Covid friendly. Really nice guy who told me the problem and was looking at his diary and decided to stay and complete the job then, so stayed on a Friday evening for almost two hours, leaving at 7.30, ensuring the job was done... Could not recommend highly enough...
Terry Garnett , Salford
15th January, 2021
No Hot Water
Very efficient and thorough - thanks again.
Danny Benson, Castlefield
10th August, 2020
Annual Service
EasyFlow installed a new thermal store water heater in our flat in Manchester city centre. Throughout the whole process, from the initial inspection, the quick turnaround in providing a quote through to full installation, we were extremely pleased with the service provided and would highly recommend to anyone in need of a heating specialist.
Matt and Alice, Manchester, UK
17th May, 2020
Installation
Engineer was prompt, very thorough, I had asked for service and repair. This was done swiftly and his knowledge of the product instilled confidence in his work. Quick, clean and good job well done. I shall be booking an annual service next year.
Beverley Venyige , West Yorkshire
30th March, 2020
Annual Service