Practically speaking yes, it can be.
Bureaucratically, probably not. It may invalidate the warranty of the system and installation is a controlled activity of the Building Regulations )I'm not certain about maintenance.
.andy
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Essentially the top outlet is a 'dip tube' going down through the top 30% of the cylinder. When the cylinder fills the air remaining in the top pocket becomes the expansion volume, the air is typically squeezed to about 1/4 of its original size (3 bar on guage is 4 bar absolute). I'm not sure but one or more of the makes may include some sort of floating baffle.
In non-Megaflow (and clones) the top outlet is just like on a vented cylinder, a hole in the top.
Heat banks are better. water stored at low pressure and high pressure mains hot water. Heat banks also last longer if the inhibitor is changed every 4 years.
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