Can I use a hot water bottle with AeroSleep products?

Yes, you can. You can follow a few guidelines to use a hot water bottle safely, regardless of the type of mattress or mattress protector you are using:

Put the hot water bottle in the bed before your child is in it. This will warm up the bed nicely.
Remove the water bottle before you put your baby to bed.

This avoids any risk of scalding if the hot water bottle were to leak.