Yes, you can use an electric blanket or heating pad on the Koala mattress range, just remember to always follow the safety instructions for the device, and turn it off when not in use. While these devices are great for heating up your mattress on a cold night, keep in mind that heat can make foams feel softer.
Always practice good mattress maintenance when using an electric blanket or heating pad, and never use if the device is faulty or otherwise damaged!