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I have purchased a new 180L Rheems Mains Pressure HWC (and valves) and looking to get it installed.
The vent pipe from the old low pressure cylinder will need to be capped in the ceiling, and a new vent pipe for the mains pressure cylinder can easily be placed under the bathtub which is currently removed. I have included a photo of the outside wall behind the bathtub too.
Everything is currently opened up, so it should be a very straightforward job.

Note, the old cylinder has been removed, so you will not have to worry about this.