i need some ideas to develop the boiler ?
what kind of boiler would you like to build?hoping you are talking about steam boiler... I would rather go for a water tube boiler, who's axis is horizontal..If you want a portable one then a fire tube boiler will be good. you need basically boiler drum(preferably made of cast iron, to withstand high pressure steam) and the tubes.. boiler accessories and mountings are must...its assembly design can be obtained from any book pertaining to the above topic...
its already been done. we even have a double boiler now