Central Heating Pumps
- Thread starter Kettle 3
- Start date
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Most pumps have two types of pressure 'head' in their specifications.
One is flow-rate achieved at each pump speed against a 'head' stated in metres (water gauge). Imagine the pump is pumping uphill to to a tank 3m above the pump. The resistance to flow is a product of how high the hill is and how long/fat the pipe is. (Usually 22mm).
Now move the tank higher to 5m above the pump. As expected, the flow rate would decrease.
Now replace the pipe, between pump and tank with one of a smaller bore, say 8mm. The flow rate would be less than was achieved using the 22mm pipe.
The other pressure stated in the specification will be total system pressure and may be 10m. This is the pressur that the pump can endure internally. Most pressurized heating systems operate between 1bar and 3bar. (1bar = 10m 'head')
One is flow-rate achieved at each pump speed against a 'head' stated in metres (water gauge). Imagine the pump is pumping uphill to to a tank 3m above the pump. The resistance to flow is a product of how high the hill is and how long/fat the pipe is. (Usually 22mm).
Now move the tank higher to 5m above the pump. As expected, the flow rate would decrease.
Now replace the pipe, between pump and tank with one of a smaller bore, say 8mm. The flow rate would be less than was achieved using the 22mm pipe.
The other pressure stated in the specification will be total system pressure and may be 10m. This is the pressur that the pump can endure internally. Most pressurized heating systems operate between 1bar and 3bar. (1bar = 10m 'head')
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