tommee tippee perfect prep machine

does anyone have this machine? I just brought one and the milk isn't very warm when it's ready but baby will take it anyway. It's only slightly cooler than what I've been giving her. the guidelines here (UK) are that the bottle must be used within 2 hours of making if kept at room temp, doesn't matter if baby has drank some. so she had some and then an hour and a half later wanted more, but didn't like it because it was too cold. I reheated the milk and then thought is that Okay to do?? now thinking that I should just get rid of machine and go back to kettle and cold water because I'll be wasted too much formula. So can I reheat the milk or not?