Then we should have ordinary bins, and accept the miniscule risk. The removal of waste bins from public areas has done more harm to our quality of life than any bomb.
Have you had a look at the FAQs at the bottom of this page https://www.showerdoc.com/newteam-201-thermostatic-manual-shower-spares (Spoiler - I see that many of the spares for this unit are no longer available so is there a drop-in replacement for this unit i.e. no need to move pipes, ...
Did you visit any of the pages you googled for? If so, they will remarket those items to you on other sites where they sell adds.
Folks visit death sites, on a regular basis, to learn, commemorate, and grieve. People go to Pearl Harbor, Auschwitz, Dachau, and old Indian battle grounds, and come out okay. A lot has to do with the attitude you take in.
And anyway, they could easily run non-stop for quite some time if the old person came back from a holiday or a visit to a friend for a few days and the house needed warming up from 5 or 10C to 25C.
Toiletology 101 may also help: http://www.toiletology.com/index.shtml
http://www.seatekco.com/images/rs-101-1c2.jpg
brand=07&defsub=40#101>
At that age, it could also be called 101 key or 102 key.
The angle is 101°