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El SID Pumps
DC Pumps for Solar Domestic Hot Water (SDHW)


SID Pumps include bronze pump housing. All SID pumps are driven by DC electricity but may also be operated with simple, unregulated AC-DC adapters. The SID’s current applications include: Solar Water Heater Circulators, Instant Hot Water Circulators, Radiant Floor Zone Pumps and Injector pumps. SID solar circulators are listed by FSEC.

  • Power Source AC/DC1
  • High Efficiency - typical start 1 watt
  • Magnetic Coupled Drive
  • Locked Impeller Protected (PV)
  • No Shaft - No Fan
  • Brushless
  • No Maintenance
  • No Noise
  • Very Light - 2 lbs
  • Very Small - 2.75" sq. - 3" thick
  • Low Voltage (Class II) Driver
  • High Temperature - 250F fluid, max.
  • High Pressure - 175 psi, max
  • Vertical or Horizontal Piping
Max. Head (Feet)
Max. Flow G.P.M2
Use With
5 watt amorphous PV panel
Primarily Solar Domestic Hot Water
5 watt silicon crystal PV panel
Primarily SDHW. Also, used in “instant hot water” loops.
10 watt silicon crystal PV panel. Use 20W PV if Glycol
Primarily SDHW.
30 watt PV Panel
40 watt silicon crystal PV panel
Primarily SDHW. Use 2A in-line fuse.
12 Volt battery,
usually lead-acid
Primarily radiant floor circulation zone pump. Fuse @ 1A
24 Volt battery, usually lead-acid. (3-35 Volts, full speed regulation occurs between 20-35 Volts)
Primarily radiant floor circulation zone pump.
12 Volt battery,
usually lead-acid
Used as boiler and radiant floor circulation pump. Use 2A in-line fuse.

MAX FLOW assumes “one-sun”.
** Preliminary Measurement


1 Use a common AC_DC wall adapter for AC operation.
2 Use easy opening check valve; e.g., Heliodyne no. SCV-.5. on the return side. NIBCO T-480-Y (with spring removed) on the feed side. OR Use "bottom return without valve (warm climates)
3 For photovoltaic driven SIDs: 20 volts max. For B12 SIDs, 16 volts max.For B24 SIDs: 35 volts max. Use Fast Blo Fuses with Battery Pumps;
Typical DHW system @ "1-sun" = 1 g.p.m.; SID3.5 & water Use 20 watt PV with SID10 & glycol, above 35° latitude, typical

Alternatively, unregulated AC-DC wall adapters may power SIDs. The Adapter Body is introduced at the nearest duplex. Its’ isolated low-voltage output wire connects the adapter to the pump. The adapter’s class II wire may run tens of feet, thereby avoiding the expense of an electrician’s conduit or ROMEX.

NOTE: A SID™ pump has no shaft or attendant shaft seal, which might leak. There are no bearings to burn or brushes to spark. Therefore, these pumps may qualify as “explosion proof”.

Frequently Asked Questions:

What is the difference between the B (battery) and PV (photovoltaic) versions?

There are specific models that can be powered directly with a PV panel or a battery, or with an independent AC/DC power supply. If you're going to use an AC/DC power supply:
• 14-17 volts DC; use a PV model El Sid Pump
• 12 to 14 volts DC; you can use a B model El Sid Pump

What is the pump's power usage?

3.5 or 5 or 20 watts at 12 V, and 10 watts at 12 or 24 V.

What is the SID pump's best use?

The pumps are circulating, and are best for circulating water in a closed-loop system, such as heating or solar. As for anything else, their use is as unlimited as your imagination. Keep in mind they'll pump water, as well as antifreeze and various other chemicals.

Here are just a couple of ideas:

• You can power them with a small RV deep-cycle 12-volt battery. Keep a trickle charger on the battery so that if the power goes out your pump will keep on running.

• For solar system loops, the SID can be powered directly from a PV panel. The sun comes up, heat builds in the solar hot water panel and at the same time electricity is made in the PV panel. The pump slowly starts with the smallest amount of current and pushes the heated water to the storage tank. It's all too simple and eliminates all controllers, thermostats and sensors.

What is the most common size?

The SID10, because it's been around the longest. It's a good average size for radiant floor heat and domestic hot water solar.

What would the 3.5 and 5 watt models be used for?

Smaller systems, anything that needs less lift.

Why are SID pumps more expensive?

They're actually fairly inexpensive compared with other cheaper and shorter-lived pumps. They have, for instance, no brushes to change, and no moving or rubbing parts.

Product Manufacturer: Ivan labs, Inc.

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