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General guidelines
In order to obtain the best performance from the system, restrictions in the water flow should be kept to a minimum. The use of right-angle bends and large variations in height should be avoided where possible. Ideally, the Hydronic should be mounted as low as possible in regard to the other water components in the system. This will minimize the possibility of air collecting in the Hydronic heater and assist with initial air purging. The above is especially important when an expansion header tank based system is used.
Types of water systems
There are generally two types of water systems that can be used. The most common type is the expansion header tank system as shown in Figure 4/5. This type of system uses an expansion tank situated at the highest part of the system. This ensures the system always has ahead of water and allows for the expansion of the water as it rises in temperature.
Pressurized or sealed systems use a pressure vessel and gauge as shown in Figure 6, and can be filled and topped up by a filling loop.
For ease of installation and simplicity an expansion header tank system is preferable as long as a suitable high position for the tank can be found. A pressurized/sealed system does not have this problem although it is initially more complex to install. This type of system is less affected by the height variations of the system water components