I have a steam generator monster of an iron. Now, I am not a huge fan of ironing, mainly because I don't seem to get the opportunity to do much ironing, but I do like my clothes ironed.
I iron my stuff when I can, which tbh isn't often, so it tends to end up on a never ending ironing pile.
Mum comes to my house and insists on taking it with her, and ironing it at her house. I always tell her not to worry, that I'll manage it myself, but she goes on and on about it, until I give in and let her take it, and to be fair, I appreciate it and I tell her so.
Now, my mum tells me that her iron has given up working. 
She has said she'll have to take my iron until she can get herself another one.
My mum irons constantly, and I mean constantly, hours and hours every week.
Now, I always use deionised water in my monster of an iron and mine has lasted me ages. My mum thinks this is totally unnecessary and uses tap water, never descales, and her iron (which was also a steam generator) has lasted her just over a year.
I do like my iron, and I can't afford another one if my mum clogs it up with limescale or it breaks. OTOH, my mum can afford another iron if she wants one.
I have told her she can iron her stuff at my house until she gets another one, but she's insisting on taking it with her to her house.
I think I have a little basic iron in the cupboard. AIBU to let her borrow this one, since I don't care if it never comes back? Or should I lend her my prized iron because she has helped me out by doing my ironing for me on a regular basis over the last year or so?
PS: I am quite happy to do my own btw.