If you use a 3 amp fuse and either a double pole switched socket or an
unswitched socket it will work quite safely. It would however be better to
use a switched fused spur and wire the boiler into that.
More of the same, my gas central heating boiler, pump and wall thermostat
are all powered from a 13amp plug in a wall socket. If you are talking about
a wall hung boiler near a kitchen sink then there might be an electrical
safety issue regarding a 13amp plug and socket due to the close proximity of
the sink, taps and water.
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