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http://www.vaillant.co.uk/downloads/ecotec-pro-instn-maint-261423.pdf
Pretty sure that means a 3 amp fuse
All the radiators are disconnected, so if I turn the boiler on I'm not gonna get in loads of trouble, right?
How much electrical energy does it consume in watts. 3amp is very low but there's not much power consumption going on inside a modern boiler.