The heater itself can`t remember how much about £120 i think,you will need 2 double ended female 1/2" fittings for the water in and water out,you will need 2 double male end half inch nipples,2 male hoselock connectore to go on each male nipple end and 2 female hoselock connectors to go on them.You will probobly need a longer hose from DI to heater aswell depending on where you fit the heater,i have mine on the back door so needed a longer water in hose from DI.2 batterys i can`t remember the size the biggest ones you can get from most shops lol,1 gas bottle and a regulator for the gas,save the end that screws into the heater and cut the end where you`ll change the regulator.1 small O ring or jubilee clip that screws over the hose the gas bottle end and that`s it if it seems complicated don`t worry it`s not far from it,if you need to be talked through it let me have your email and you can phone me.