Hi there ,,I just bought a 2001 268 vista,it wont be arriving to me for another 6 weeks at least ,and I have been trying to find out info on the cruise air a/c reverse cycle heater,does it only operate while on shorepower(I have no generator)

or will it work while im out on the water as well? Im wondering if the heater will work while im out fishing etc with the family,I was hoping with the camper pack up it may keep things a bit warmer over the cooler months,I realise its a bit of a stupid question,but ive never owned a boat with a/c or heat,so its all new to me right now,any help would be great! cant wait to get her home and get to work cleaning and grooming her up ,cheers ,Mike