Many thanks for the replies,
Your right i know nothing about electricity! Had a fully qualified elecrtician put down the cable, correct according to building regulations here in England. Have spoke to the dealer who has assured me that a 20Amp supply is fine. I have no reason to distrust the dealer, after all, so far he has been out within 24hrs each time a pump has failed! Excellent service, just think no harm in a second opinion? May be i have been unlucky and had 3 faulty pumps?
If there are any electricians out there?; I know all components within the tub simply add up to 30Amps, but if they all where running and trying to draw 30 Amps-would the 20 Amp breaker trip? It doesnt trip so maybe the dealer is right?
Hope that makes sense !!
Cheers Stu.