Two!
They were on sale at Amazon so got another one as mine’s about a decade old and I got a bit worried after hearing how some of you had said yours had split/bust. So I tried both together and put them either side just below knee height, and it makes quite a difference - highly recommended 
The one I got was this one:
https://www.amazon.co.uk/dp/B0CHMKJMXH?ref=ppx_yo2ov_dt_b_product_details&th=1
It’s even cheaper now! £7.99!
(I opted for that one as it’s made of natural rubber)
Sitting here under my electric fleece listening to some relaxing baroque music the thought of owning one of those hot water bottles is very tempting indeed🌛
I thought you had got a dog 
What’s warmer than a hot water bottle to keep you warm at night?
A nice, hot man, obviously 
That would get me hot,just thinking of Britt Ekland.
I prefer not to use anything to warm my bed. There’s nothing quite like the thrust of a naked body into the cavern of a cold duvet…
Do one thing each day that takes your breath away…
Before I got my heated blanket, I would have sometimes 3 or 4 rice bags that I would heat in the microwave. Under the covers, they could last the whole night. More is definitely warmer.
My duvet, best one I’ve ever had, it’s lovely & was expensive. No need for hot water bottles or electric blanket.
Same here, and no pyjamas!
Oh! I wear pj’s too, mens pj’s because they have long sleeved tops.
My room is not that cold that I’d need anything extra.
My husband. You can borrow him. I’ll ship UPS.
Since a younger gal (many moons ago) I’ve most always liked the warmth of a water bottle on my feet when in bed. LOL
