Its just a meteour Heat Exchanger not sure if I have spelled that right ! but its on world of clean .co.uk they cost about £360 new inc vat and to be honest I have only used it a couple of times, I bought it because the Scorpian dosent have a heater, these days I either use M Power and dont need hot water rinse at all or I use a 4KW emmersion heater that was made for me