after a lot of hours working at it, and discovering salt and citric acid make for accelerated descaling of lime scale, the kitchen hot water system is finally functional, warm water is coming out of the hot tap already. next boss is actually plugging the damn plug. got some kind of plastic wine cask thing, i think it's made of medium chain polyurethane, gonna carve it a little to get it to actually socket into the drain (couldn't find one that fits anywhere at the hardware stores, fuckin retarded nonstandard shit), and then i can do washing up like a normal human being