User Manual Russell Hobbs 23791 Easy Fill Iron

You can use it in any iron as far a I’m aware. I’ve always used it
in all of ours.

I’ve used ironing water with this iron since new and had no
issues, I also press the clean button every time I use it to keep
it clean never had any problems with steam

No, but a very effective warning beep if left flat and in danger
of scorching something.

Only way to switch off is at the plug never seen a iron with an
on off switch. Sorry.

Don't know the exact weight, but it is quite easy to handle, so
not heavy at all.

No - tip, if you are in a hard water area use de-ionised water.