Spa Power

Hey guys,
Ive got a bit of an odd situation here... I bought a spa second hand and Ive hooked it all up to my old pool circuit but the spa heater doesnt have a plug on the end.
According to the manual it is single phase but says that it is 25amps. The highest plug Ive found is a 15amp and it just doesnt seem to add up to me. The wires are the the flat twin and earth cables which also dont fit a standard plug.
Is it just that its late at night and I cant think properly, or does something not add up?
Cheers,
M.

Possibly the spa was originally hard wired into an isolation switch?

Yep.........it'll have been hardwired into a 25amp circuit.....just like your average electric oven. Time to call a sparky!!

Thanks guys. Was pretty sure that was the case but was kinda hoping there was something simpler. Ive got a leccy coming out next week... lookin forward to finally gettin into the spa! :)
Cheers
m