Re activating a small H/W stored system after 7 years dormant.

[12poi]

A small H/W system with Imm Cylinder and two outlets to basin and sink - has been storing dormant
water for seven years in a void flat.
The idea is to now activate the H/W system in the Imm Heater cylinder and at the two outlets. (the shower is an elec unit).

Suggestions for a safe re-activation of the system.

 

[PlumbBobBob]

after 7 years I would look to changing the cylinder at least. there's no knowing what nasties have bred in the past 7 years.