On Tuesday, March 20, 2018 at 2:48:07 AM UTC+11, Graham. wrote:

Which is the best fuse to use (3A, 5A or 13A) with a 1.15kW electric fire at a potential difference of 240v
1150/240=4.79 so theoretically a 5A fuse shoud do.
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Graham.
%Profound_observation%

May be 5A will do, as "cold" heater element resistance would be higher than normal heating.