Although a few homebrewers in the UK use gas, most will use an electric fired boiler (you dont have to worry about boiling outside or the gas runing ou

). 1 x 2.4kw element is sufficient although it takes a while to bring 5 gals to the boil, so i've installed 2 x 2.4kw elements and use both to bring the wort to the boil and switch to one to maintain a rolling boil. If you use anything more powerfull you may find it usefull to install a power controler.