What’s the difference between good and bad stratification in a cylinder?

Good stratification means that the majority of the cylinder contents are being warmed up to the desired temperature whereas poor stratification means that the majority of the water content is cooler, with only a small volume of water towards the top of the cylinder being the desired temperature. The infographic below presents the difference between good and bad stratification.

In summary, all stored hot water forms layers of differing temperatures. Stratification is required to facilitate maximum efficiency with the hot draw off at the top of cylinder. As the right hand image shows, water stored at the top of the cylinder has useful heat and the water stored towards the lower part of the cylinder does not.

Diagrams showing poor and good cylinder stratification
The left image shows an example of good stratification in a cylinder and the right image shows poor stratification.

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