Hot Water Bottles

[rutineli]

Unfortunately I am at an age where the most reliable bed partner is a hot water bottle.
I have one that was passed on to me by a friend a couple of years ago and I "forgot" to give it back.

I noticed when emptying it in the mornings that there was a trace of residue from the rubber so I went to Boots and was mug enough to cough up �12-00 for a covered pvc replacement.

The label on it very clearly warns against filling the bottle from the domestic hot water supply. I have always used that as the temperature is just right for me.

Does anyone know why it is supposedly bad for a Boots bottle??

[rutineli]

jayellell, your answer was inspired and has restored my faith in the answerbank beyond limit or desciption. Thank you my friend for such a comprehensive and sensible answer.

With kind regards, - rutineli