a hot tub of that size when full of water will weigh about 2200kg
broken down at approx 1800l water and if its a hard shell tub about 400Kg for the tub its self we were recomended to pour a reinforced concrete base 150mm deep
as for power the one i had at my old house needed a 25A suppy for the pumps and the heater
so based on mine it will draw about 5.5Kw when running with both the pumps and heater on
but i do agree 2.5 tonne on the roof of a 2 bed might be a bit much but on a ground floor 3 bed not an issue except for the power consumtion
This message was last edited by kitchenman on 26/02/2014.