What voltage do you have available in New Zealand? Do you clean residential and commercial? What amperage plugs do you have available for both if you do. Any fuses, circuit boards, switch ratings, etc. may have to be upgraded if you add more powerful motors and pump. Make sure whoever you end up taking advice from knows New Zealand Electrical Codes. Smartest thing you can do is stay 3-4 amps below the lowest amperage plug you will be using, no matter what circuit breaker size is being used. If you have a 20 amp breaker feeding 15 amp plugs, then that cord for your vac motor, vac motors, or vac and pump should pull no more than 11-12 amps ideally. 20 amp plug, 16-17 amps max. Mfgs ignore that all the time. A 15 amp plug doesn't know when your trying to pull 16-20 amps through it , and when that 15 amp plug is on a 20 amp breaker, the breaker won't trip. But you will over heat that plug and the wiring feeding it. Now you may not start a fire at the time your cleaning, but that plug will be damaged, weakened for the future and the customer may end up with a fire and kill people because of the carpet cleaner using a more powerful porty than they should.
