Hot water bottles



I always put a bit of cold water in the hot water bottle first, before the boiling water. Was always told this is necessary, but is it really? Have I been making slightly colder hot water bottles all my life for no reason?

Is that not just the fact that old hot water bottles were rubber and would melt if boiling water was poured into them directly? Modern ones are silicone iirc and don't have that problem.
 

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