There are toilets on the upper and lower floors, how to connect the circulating water pipes?

1. It depends on the distance between your hot water source and the water point, if the distance is too far, a lot of cold water will definitely be released. This problem is particularly acute when it comes to the supply of water from a central hot water system. If the water supply is dispersed, such as not having a bathroom and a water heater, there is no such problem.

2. From the time you describe a main hot water pipe divided into various layers, it should be a centralized hot water supply system (the so-called central hot water supply system). This water supply method should be a hot water return device, which is what you call a hot water circulation system. The specific method is to connect a return pipe from the end of the hot water supply to the bottom of the hot water supply source, and the cold water in the main pipeline is pumped to the hot water source to be reheated through the water pump circulation in the middle, so as to ensure that there is hot water after the faucet is turned on with water and electricity (because only the stagnant water of the main pipeline is discharged, there is still a small amount of stagnant water in the branch pipe when used).

The circulating pump can be controlled by temperature, time, manual or water flow switch.