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Specialists in Electric Hot Water Cylinders
If you’ve noticed that there’s a smaller tank attached to your water cylinder, this is the expansion vessel. It may be mounted to the top of the cylinder, or it could be attached in some other location. With some models, it is actually within the casing of the water heater. It all depends on the make and model in question.
You’ll find quite a few different styles of expansion vessels have been used over time, but the most modern (and most common) style uses a flexible membrane within the vessel itself. The expansion vessel actually contains two sections. A rubber diaphragm separates the two. One side of the vessel is connected to the hot water system and holds water. The other side holds air.
For the most part, expansion vessels operate without any need for your intervention. You may need to drain and recharge your expansion vessel periodically depending on its age and the style of vessel in question. However, they can suffer from some problems, particularly as they age. For instance, hard water and even water treatment chemicals can cause the rubber membrane within the vessel to degrade and break down. Eventually, it will fail, requiring replacement.
If you think your expansion vessel needs to be repaired or replaced, contact a engineer experienced with unvented cylinders and their operation. EasyFlow can send an engineer to you if you’re located in Greater Manchester, Warrington, Liverpool, Chester or Leeds.
Jonathan, Liverpool
22 November 2023
Replacement Valves
Dominic, Chorlton
6 November 2023
Heating Control Replacement
An excellent service as usual and Chris was very helpful and informative.
Derek, Chester
2 October 2023
Annual Service
Dean, Dukinfield
19 October 2023
Annual Service
EasyFlow are easy to deal with, responsive and prompt. They do a great job.
David, Wilmslow
6 October 2023
Annual Service
Excellent service. Very professional very knowledgeable and gave some great advice
Elizabeth , Irlam
4 October 2023
Annual Service
Walid , ALTRINCHAM
4 October 2023
No Hot Water
excellant friendly quick service...!
Paul , 108 the boxworks
5 September 2023
Replacement Immersion Heaters
Personable, professional and efficient service. Highly recommended.
Polly, Oldham
4 September 2023
Annual Service
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