You can find hydronic circulator pumps inside closed hot water home heating systems. These pumps are responsible for circulating hot water inside the heating system. Hydronic circulator pumps work in conjunction with boiler, hydronic zone valves and thermostats for maintaining the temperature of your home.
Hydronic circulator pumps that are used inside the home are usually small in size and are powered with the help of electricity. These are constructed from cast iron and are installed near boiler in series with the hot water piping.
Hydronic circulator pumps are sealed units with an internal motor, bearings and impeller, thus making them less prone to leakage and breakdown. They are typically installed in series with the boiler, hydronic zone valve and hot water heating.
Whenever you need heat, the setting of thermostat is changed accordingly. Now the zone valve is opened and the circulating pump gets activated by this causing circulation of hot water through the hot water heating system. If the water cools down then the boiler gets turned on and water in the closed loop hot water heating system is heated again.
Besides being used for home heating systems, a hydronic circulator pump is also frequently used for supplying on-demand hot water for the home's domestic hot water needs. The circulator pump continuously provides hot water through the home hot water supply lines so that when a hot water faucet is turned on, hot water is immediately available. The advantage of this is that water is not wasted but the disadvantage is that you waste energy by constantly heating water that may be rarely used.
In case, you want to use a circulator pump for your home's hot water system then you must insulate your hot water supply pipes or set a timer on your system so that you could lessen the wastage of energy.
The performance of a circulator pump can be calculated using its flow performance. The flow performance basically can be determined by the flow-rate (number of gallons/liters of water that can be pushed through the system per minute) and the circulator pumps head pressure.
Head pressure rating of the circulator pumps is the maximum height up to which the pump can lift the water. However, if you have a large hot water system design in which the water needs to go up two floor levels (e.g. from ground floor to the second floor of a home) then you need to have a circulator pump that could support a higher flow performance with a high head pressure.
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