This is the missing "Mitsey" cat.
IMG_20231211_092900_452.jpg
 
I was reading Garys answers and if the vent pipe from the hot water cylinder does not go high enough and drops down to low and the end is in the water it can cycle round and heat the tank up which could make it go out of shape.

Ah ok now there's a thing, you could be spot on there as there is a pipe going through the lid into the tank.
If the cold water wasnt going out the overflow as it was higher than the tank & water level rises the vent pipe
would be in the water.
 

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