It can be difficult to find small pumps for home projects such as fountains or small water falls. Usually, if you do an internet search you will wind up on aquarium supply sites. These are not usually adequate for the job, often under-powered and no flow and head information.
There is one area that uses small pumps extensively, the residential thermal hot water panel supply sector. The pumps are used to move a glycol solution to the solar thermal panels and often through a radiant floor heating systems (Figure 1).
Figure 1. Solar hot water thermal system.
In the close loop system shown in figure 1, glycol has to be pumped up to the collector which could be 30-40 ft up. But since the energy is recovered on the down side there is no static head and the pump is only required to overcome friction head. This results in a very small pump with low power requirements. The pumps are directly mounted to the motor in a nice compact package with DC or AC motors. The DC motors can be powered by a PV solar panel for applications that are remotely located. If you are worried about corrosion many of these pumps are available in different materials such as stainless steel, bronze or iron.
|Pumps||Volts||Watts||Shut off head (ft)||gpm at head|
|Taco 009F||120||168||34||5 at 20 ft|
|Grundfos 26-96F||120||205||30||15 at 14 ft|
|Taco 011F||120||211||30||15 at 18 ft|
|Grundfos 15-42F||120||85||16||10 at 9 ft|
|Taco 008F||120||95||16||10 at 8 ft|
|Taco 006B||120||62||8||5 at 5 ft|
|Grundfos 15-18SU||120||85||7||5 at 5 ft|
|March 809-BR-HS 12VDC||12||50||15||4 at 8 ft|
|March 809-BR 12VDC||12||20||7||3 at 3 ft|
|El-Sid 20PV direct||12||20||4||3 at 42 in.|
|El-Sid 10PV direct||12||10||3.3||2 at 35 in.|
Table 1. List of small pumps for home projects.
Small pump web sites: