Anyone shed any light on this system. Baxi Bermuda 551 which is apparently the first Bermuda made in 70's and there was only 1 tank upstairs which seems to have a built in header tank. In the main part of the tank had 2 cylinder tanks, 1 sticking out of the water and one at the bottom of the water which you can just about make out in the pictures. Couldn't find any pump or anything although it could be under the floor somewhere