Sanitary water
In the building there are, in the first first floor level (the main house) two bathrooms and a kitchen; and in the low level there is an extra bathroom by the service's stairs, that could have been installed there for service workers or to have a quick and easy access to a bathroom meanwhile the house's users were taking a walk in the land.
All of these wet rooms need to use, at least, cold water to function, but it would not be comfortable at all in the case of sinks, showers (not the case of toilets, that only use cold water), and it wouldn't either be efficient for working in the kitchen, as if there was no hot water from the faucet, they would have needed to be heating it un in the stove or at the beverage boiler.
Kitchen, original state. Marking the mixer faucets in blue.
Bathroom (original state). Marking in blue the need of water.
The clear indicator of the use of hot water in the house are the bathroom's sinks. We can see that Amancio Williams left exposed both hot and cold sanitary water pipes that reach a mixing faucet.
This mixing faucet is a comfortable consequence of having both safe sanitary cold water from the general system and hot water from the boiler. In some older housing, there were separated hot and cold faucets because cold water was safe to consume, but usually the hot water was heated and accumulated in a not suitable water tank.
The automatic hot water boiler for domestic use was invented in the 1890's, first using gas from the general gas network, and soon adapted to standardized plumbing and increasing use of electricity in the population's homes. There are no images found of the hot water boiler, but it probably worked with electricity like the kitchen stove.
Sink's function illustration.
Taking a look at the original pictures and plans, we can make a guess of how the sanitary water installation would have been:
This plan is merely schematic to see how could the sanitary water installation could have worked. Hot and cold water pipes come to the house through the bracket to the installations room downstairs, where the water meter and boiler would have been installed. In the house, they navigate to the wet rooms through the closets walls (by the stairs) or under the floors. The same system would have been used to direct hot and cold water to the lower floor service bathroom, by directing the pipes through the first level floor slab, under the house's water installations, and then gets to the service bathroom through its downspout.
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