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If freeze protection is an issue than a closed system with anti freeze is a good idea.

Closed hot water heating system.

Closed loops that are leaking can waste water and energy while causing corrosion. All water heaters waste heat energy even when the burner is off and the unit is sitting idle between heating cycles. Remember to give the system time to drain and fill. The expansion of water 4 7 from 0 o c to 100 o c can be collected in an open expansion tank above the rest of the system or inside a closed pressurized tank close to the boiler and safety valves.

A closed water heater system means that the hot water cannot expand beyond the valves and mix with the municipal water. One circulating heated water to the rooms and the other returning the much cooler water back to the boiler to get reheated. Closed systems are often used in second homes or primary residences in areas prone to long power outages. The down side is two heat sources.

Water boiler a boiler is used to heat just the water as it boils the water and turns it to steam. They can be used with radiators or radiant floor heating. Whether you use radiators or radiant heating the process of draining and refilling the boiler is relatively simple. Hot water chilled water tempered water process water and glycol filled closed loops are often ignored when considering a water treatment program which can be a costly mistake.

In modern systems closed tanks are preferred. Closed loops that are not properly treated can cause significant corrosion damage. Closed loop water treatment. These are for closed systems usually called hydronic systems and they are just for heating.

Since on many hot water heating systems a key air bleeding or air vent point is at the air scoop or air separator closer to the boiler. Unlike conventional water heating systems closed hot water boilers should only be flushed when operation problems occur. There is a third type called a combi water heater that can actually do both. Newer units have many zones with two water pipes linked to each zone.

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