We used to Have a Hawaii Hydrojet Pro, which we stopped using because it was getting expensive to run. Recently bought the new Barbados EnergySense AirJet, because of its new insulation jacket, and Im complete surprised at how much cheaper it is to run. Once it up to temperature and Id set the app up on my phone, it goes on for an hour in the morning and h1.5 hours in the evening, on days we're using it, and from my smart meter id say its between 50-75p per day! Fully understand as the weather gets colder this cost will increase. So far very happy with!!