The appliance that was sent to me,was faulty,secondhand, and the commision date was 2009. after speaking with the Tec dept ,They had not got a clue why a simple unit LPG water heater,would not engage the burners etc.As an ex Tec/Gas Inspector/Installer, my opion too many wanna be clever parts, do us all a favour. Keep it simple, Dont do the Worcester ( Im Posh,but rubbish).Hype...Could be a lil cracker.(Ferrolli Tec) nice guys,after service Top notch, " Calor Appliances ltd" ,Could not fault there After care/and Polite buisness style.. Sorry guys, But.. Recommend them anytime...We all have a bad one,in life.. Burt.