Heat Pump Hot water Help

We are looking at getting a Dux heat Pump hot water system and we have
been told that it can only be run of Off peak 2 or Constant is that true
or can it be run just as well of Off Peak 1

the reason im asking is i would prefer to keep it on Off Peak 1 so to keep the
price of electricty down

also some plumbers are telling me that Dux is better some are telling me to'
go with rheem and some have told me that they are the same

im also not sure how much of a energy saving it makes as ive gotten from
40% to 75% depending on what plumber im talking to


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