On Sun, 26 Apr 2020 11:15:52 +0100, Kellerman
wrote:


It might prove a little difficult to undo and unscrew the faulty
immersion element. How old is it? Any sign of additional sealant or
corrosion? They can be very stiff to undo.

If you try loosening it - try first to see if it will move with a full
tank of water so it has some weight to counterbalance the spanner force.
The danger of that is that it might leak afterwards!

It is an insulated stainless steel pressure vessel and the lower
thermostat is near the bottom of the tank so any attempt at removing
it when the tank is full or partially full will most certainly produce
an impressive leak.

Last one I did came undone but distorted the tank slightly.

If you manage to distort a high pressure tank at all it would need to
be replaced.