No not suppose to use them together.
Yes.
Yes
Yes, you can use an electric blanket with a memory foam mattress topper. You might actually enjoy the feel of the mattress more when using an electric blanket because they often times feel different depending on the tempurature.
Electric balnkets can be safe depending on how you use them and how you treat them, if you use an electric blanket during sleep you may need to be aware that the electric blanket can catch a fire during long periods of use (4-9 hours).
We use foam rubber to stop condesation of water from the surface of pipe.
No, but an electric blanket can interfere with a pacemaker. Furthermore, electric blankets are dangerous in general!
Yes
an electric blanket uses 200 watts(wattage). If you left your electric blanket on for 10 hours you might end upwith a 30 to 50 cent fine.
Yes you can
They can! My Grandad does
Can I use a woollen underlay or mattress protector with my electric blanket? Yes, if you have a Safe & Sound electric blanket manufactured in 2005 or later, it can be used in conjunction with an underlay, providing it does not have a heavy rubber backing. The underlay or mattress protector can be placed either on top of the electric blanket or underneath it. Please note that your electric blanket may take longer to heat up should you place the underlay over the top of it. If you have any other Sunbeam electric blanket (i.e. not Safe & Sound) or one manufactured before 2005, you should only place the underlay or mattress protector underneath the electric blanket. Placing a heavy underlay over the top of this type of blanket may trap the heat and inadvertently activate the safety overheat protection system, which cannot be reset. If using a magnetic underlay, you should check with the supplier of the underlay to ensure its effectiveness when used in conjunction with an electric blanket.
yes you can