54/75 only heats our bedroom at first - then kitchen and bedrrom then kitchen only. In the evening its lounge only until the bedromo turns on an hour or two before bedtime. Why waste money heating rooms that you are not using?!

55/75 These can get a bit pricey from UK retailers, but are cheap (£10-15 each) from chinese retailers such as AliExpress - thus at that price they are likely to quickly pay for themselves.