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 used for residential use are small centrifugal type pumps that are electrically powered. They are typically made out of cast iron. You can locate them usually near the boiler and in series with the hot water piping.
Hydronic circulator pumps are normally sealed and have internal motor, bearings and impeller that prevent its leaking and breakdown. They are normally placed in 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.
A circulator pumps performance is measured by its flow performance. The flow performance is a function of the flow-rate (number of gallons/liters of water that can be pushed through the system per minute) and the circulator pumps head pressure.
A circulator pumps head pressure rating is the maximum vertical height the pump can lift the water. Consequently, if you have a large hot water system design that needs to go up two floor levels (e.g. from the basement to the second floor of a home), you will need a circulator pump that can support a higher flow performance with a high head pressure.
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