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Why has everybody got a thing about 240v on the control circuit?there are 1000's of control circuits using 240v for the control circuit,some even use 415v,in far harsher environments than your homebrew shed.The switches in the original link are sealed and waterproof,although i cant find an IP...

Fs1 will close contacts once the liquid reaches it and remain closed until the liquid falls below it ,when fs2 is trigered it will pull in the relay ,which due to the self hold circuit,stays engaged until the level drops to allow fs1 to opens

Looking at the spec for the switch they can be used for normally open or normally closed contact,so a standard motor control circuit should do the trick,make fs1 normally closed and fs2 normal open.

you want bling,sit the boiler on a set of digital bathroom scales, 1L water=1Kg

Theres a place in new bradwell,milton keynes, http://www.homebrew-kits.co.uk/