How does a 400W single heat setting heater run at 1p an hour?

http://www.shop.edirectory.co.uk/tru...asp?pe=CCCBAJB
Q_+Dimplex+400w+Low+Wattage+Panel&cid=1762

or

http://www.argos.co.uk/webapp/wcs/st...y?storeId=1000
1&langId=-1&catalogId=2501&productId=112113&clickfrom=name

Arthur