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The image contains a diagram illustrating components and flow in a central heating system in a two-story house setup. Main elements labelled are "Water tank to fill storage tank," "Cold water into the house," "Overflow pipe," "Storage tank," "Hot water to taps," "Boiler (gas or oil)," "Pump," "Hot water radiators," and "Small tubes." Arrows indicate the direction of water movement from the water tank through the boiler, radiators, and to hot water taps. Instructions below the diagram prompt to summarize the information, select main features, and make comparisons if relevant. There are no numeric data points or percentages provided.
Given the complexity of the image, the above description may not be entirely accurate.
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The picture illustrates the working steps of a central heating system in a house. It is clear that there are four stages after cold water flows into the house.
At the first stage, cold water along the roof flows into the house, separated to two pathways into the storage tank and boiler. After the boiler, we can see there are two paths running from the water pipes into the small tubes and hot water radiators around the whole house. It is worth mentioning that only cold water needs to go through the pump.
The other stage is about the storage tank. There are two ways using the water in the storage tank, overflow pipe and hot water to taps respectively.
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