Hello Paul, I have just realised that you are writing about a Quick water heater and thus the same as mine. If you put in my subject as above in this sites search facility you should see the earlier stuff. You will find some pics in the Bali Hai changes photo album and more info in old messages 1126-1130 and 1764. I think I did another posting which I cannot find which said that after changing the anode the hot water was a bit like carbonated water until the new anode presumably expired after a couple of months. It is hard to see from my pics but I am pretty sure that the anode fits or screws into a fitting next to the hot water take off pipe. If like me you want to make sure of reconnecting correctly take some pics to improve your chances before you disassemble things! The makers website is www.quickitaly.com/ENG/framedownload.htm I have not opened the heater since but hope that it is not so badly scaled up as I have not been taking on mains water and that watermaker product is lime scale free...hope springs eternal in the mind of a lazy man.