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Pumps used in
solar heating systems are called hot water circulator pumps. Many pumps are
not designed for more than 120°F and will fail prematurely if used in heating
systems. Solar heating pumps are sized to the application based upon head and
flow rate. The head of a pump is the power it has to overcome both the vertical
height that the liquid must be pumped and the friction of the liquid against
pipe walls. Frictional head loss is not significant except in very large
piping systems. Hot water circulators are designed with a wide range of head and
are classified as low head (3' to 10'), medium head (10' to 20') and high head
(more than 20'). Low and medium head pumps are normally used for closed loop
(glycol and DHW) systems. High head pumps are used for drainback systems and
large baseboard or radiant floor heating systems.Pumps for domestic hot water or other open loop systems should have bronze or stainless steel housings to prevent scale from building up. Pumps for closed loop systems may have iron housings although a bronze or stainless steel housing will normally last longer.
Pumps and Flow Rate
If the system controls are working correctly, an inoperative pump may be
due to a stuck impeller, a burned-out motor, or a broken shaft. These
types of problems may be expected over the lifetime of any component subjected
to the temperature and cycling stresses of a solar system pump. Even though a
solar pump is operating and is being controlled correctly, there still may be
problems with the actual flow rate in the collector loop. If the pump has been
sized to just barely overcome the pressure head of the collector loop, an
unexpected added resistance can stop all flow through the collector. For
example, air in the fluid may, over a period of time, collect in a section of
piping, especially if it cannot escape through a vent to the atmosphere. This
"air lock" can prevent any flow if the pump does not have the capacity to
compress the air completely and force it through the system. In an indirect
system, loss of collector fluid pressure can also prevent flow in the collector
loop. The pump is generally not sized to overcome the static head or pressure
due to the difference in height between the top and bottom of the collector
loop. It is usually sized to maintain the desired flow against the dynamic head
or pressure due to the resistance to flow in the pipes, fittings, and valves. If
the fluid pressure to overcome the static head is lost, then the pump may not be
able to maintain flow against the combined static and dynamic head of the
system.
| Model 006-BC4 | $ 289 |
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| 1/40 HP motor is impedance protected. Bronze body with 1/2" sweat fittings. Delivers flows to 12 GPM; head to 10 feet. Designed for domestic hot water systems and circulation of open fresh water and potable water systems. | ||||
| Model 006-B4 | $ 289 |
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| This pump is the same as 006-BC4 but has 3/4"sweat fittings. | ||||
| Model 006-BC4-1 | $ 289 |
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| This pumps is the same as 006-BC4 but has 1” threaded fittings. | ||||
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| Model 008-F | $ 269 |
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| Cast iron flanged body. Flows to 14 GPM and
head to 16 feet, 1/25 hp. Designed for use in closed loop solar systems and hydronic
applications where higher head is necessary. New installations require a flange set. |
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| Model 008-B | $ 479 |
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| This pump has the same GPM and head as the
008F pump but is a bronze body. Designed for use in open loop solar
systems, DHW water circulation. New installations require a flange set. |
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| Model 009-F | $ 265 |
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| Cast iron flanged body. 27 foot head at shut
off; 1/20 HP motor. Designed to fit drainback systems that require a low
flow, high head pump. New installations require a flange set. |
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| Model 009-B | $ 450 |
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| Bronze flanged body. 27 foot head at shut
off; 1/20 HP motor. Designed to fit drainback systems that require a low
flow, high head pump. New installations require a flange set. |
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| Model 0011F | $ 275 |
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| Cast iron flanged body. 30 foot head at shut
off, 28 gpm maximum flow. Designed to fit heat exchangers systems and
large radiant heating systems. New installations require a flange set. |
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| TACO REPLACEMENT CARTRIDGES | ||||
| 006-BC4 | $ 127 |
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| 006-B4 | $ 127 |
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| 006-BC4-1 | $ 127 |
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| 008-F | $ 109 |
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| 008-B | $ 142 |
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| 009-F | $ 173 |
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| 009-B | $ 206 |
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| 0011-F | $ 226 |
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| GRUNDFOS 120 VOLT AC PUMPS | ||||
| Model UP26-96F | $297 |
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| Cast iron, 1/12 HP; pushes to 31 foot head. Designed for collector loop on drainback type solar systems. New installations require a flange set. |
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| Model UP15-42F | $109 |
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| Cast iron, single speed centrifugal pump. Designed for domestic and light commercial closed loop water system applications. Can also pump 50% glycol solutions. 1/25 HP; pushes to 15 foot head. New installations require a flange set. |
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| Model UP15-18SU | $214 |
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| Stainless steel, 1/25 HP;
pushes to 7 foot head. Designed for domestic hot water system applications. New installations require a flange set. |
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| PUMP MOUNTING FLANGE SETS |
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| Iron | $36 |
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| Bronze | $75 |
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| Set of 2 - 3/4" pipe thread bronze flanges for all flange (F) pumps. Also 1” threads available | ||||
These tiny brushless, magnetic drive circulators can be driven by PV modules or 12 volt batteries for closed-loop circulation in solar water heating systems, individual space heat zones and individual loop radiant floor loops. Use of several small pumps in a radiant floor system allows each loop to be controlled by a different thermostat.
Model SID10 is designed to be powered by a 10 watt PV module, in open loop systems and can pump 3.3 gallons per minute at no head and ½ GPM at 2.5 feet of head at 17 volts input.
A 20 watt module should be used for glycol systems. It can circulate water in a well designed solar water heating system with two 4 x 10 collectors. Model SID10B is designed to be battery powered and has the same specifications at 12 volts.
Dimensions: 4" x 4" x 5".
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Model Number |
Flow (GPM) at No Head |
Volts (Max) |
Head (ft) |
Weight (lbs.) |
SKU |
Price |
Purchase |
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EL-SID 10PV-12 |
3.3 |
20 |
3.5 |
2 |
075-07218 |
$255 |
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EL-SID 10B-12 |
3.3 |
17 |
3.5 |
2 |
075-07219 |
$255 |
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EL-SID 20PV-12 |
5.0 |
20 |
6.5 |
2 |
075-07295 |
$345 |
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EL-SID 20B-12 |
5.0 |
17 |
6.5 |
2 |
075-07296 |
$345 |
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This pump has an electronically commutated, high efficiency
brushless motor with
a 30,000 hour life expectancy. It may be operated from an 18 to 22 watt solar
module or directly from a 12 volt battery system.
They work great for closed loop solar water heating systems and radiant floor heating.
The graph shows this pumps performance at various heads and flows, at different input voltages.
| Hartell MD3DCL Circulator This pump has an economical brush-type motor that may be used with a 12 or 24 volt battery system, or directly from an 18 watt 12 volt PV module. It has a 7,000 hour life expectancy. It works well as a circulating pump between a tank and solar collector in a domestic hot water system. It also functions well as a circulating pump in a radiant floor heating system that requires less than 5 GPM of circulation. Brushes last for 3-5 years and are easily replaced without removing pump from plumbing.
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