The job of pumping the water to the header tank would certainly have been hard and tiring work for some poor servant!
From the header tank, gravity sent the water straight through to the tap in the kitchen, which was the only tap in the house until 1938. From here the servants would carry the water to where it was needed.
It seems hard to imagine that the only source of water to the house was from the spring, as this extract from a letter in 1911 shows: "the water house has to be cleaned out and they have not much water until the spring fills it up again".