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The Thermo Dynamics Direct-Drive Solar Pump™ features a brushed DC motor, rotary vane pump, differential temperature controller, and is available in three sizes. Flow rates range from 2.0 liters/minute (0.5 USGPM) to 12 L/m (3.2 USGPM). Available in 12 & 24 VDC configuration.



  • P24070 (0.3 - 2.4 LPM / 0.1 - 0.6 USGPM)
  • P50140 (1.0 - 5.0 LPM / 0.3 - 1.3 USGPM)
  • P118330 (2.0 - 12.0 / 0.5 - 3.2 USGPM)


DOWNLOAD: Solar Pump™ Brochure

DOWNLOAD Solar Pump Sizing Guide


Brushed DC Motor (models: P24070M, P50140M, and P118330)

The Mag-Drive and Direct-Drive Solar Pumps™ utilize a 12/24 VDC brushed DC motor that, because of its efficient design, is slightly larger than pumps designed to operate at 110, 220 or 240 volts. Permanent magnets are used, whereas standard motors use electrical coils and electric current to create the magnetic field. This wastes precious electricity. However, permanent magnets are heavy and bulkier than the equivalent electrical windings. To produce the torque required to boost the pressure of the pumped liquid, a heavy-duty, large-diameter armature with thick copper windings is used, thus reducing parasitic power consumption by the motor. The result is amazing! - even in very weak sun the motor produces enough power to start the pump, power that is produced in the "greenest" of all possible methods.


Solar Pump™ Introduction

The sun powers the Thermo Dynamics Solar Pump™ - no batteries, no high-voltage electricity, no engine consuming gasoline or diesel fuel - only harmless, low-voltage, solar-generated electricity, eternally available and pollution free. The Solar Pump™ system consists of a rotary vane pump driven by a photovoltaic (PV) powered DC motor and controller. The PV module drives the DC motor via a built-in linear current booster (LCB) with differential temperature controller, and utilizes a proportional speed control strategy achieved by the variable output of the PV module. This ensures maximum performance at all levels of solar irradiance and enables the Solar Pump™ to begin pumping with as little as one watt of power (one-tenth of a full sun, 100 W/m2)!!


Flow rates of the Solar Pump™ range from 0.3 liters/minute (0.1 USGPM) to 12 L/m (3.2 USGPM) depending on the model. See the Solar Pump™ Models section below for further details.

Solar Pump™ Use


The Thermo Dynamics Solar Pump™ is the perfect pump for solar water heaters. For most single-family homes, a 10 - 20 watt PV module provides all the electrical power necessary for the entire solar water heater! There are no AC powered electronic components and there is no high voltage wiring to install. All electronic components – the motor, linear current booster, and differential temperature controller - are all combined into one unit and are powered by low voltage DC power directly from the PV module. The PV module provides the precise amount of power required for circulation of fluid through the solar collectors any time heat is available for collection, and the Solar Pump™ ensures that the flow rate is proportional to solar irradiance, maximizing the delivery of energy from the solar collectors.


Installers love the Solar Pump™!

It is so much easier to install than an AC-powered circulator system. The Solar Pump™ is a rotary vane pump unaffected by air bubbles and capable of high pressure (max 50 PSI / 3.5 bar), allowing installers and homeowners to save time and money by using smaller diameter tube, and avoiding the hassles of air separation. Homeowners also appreciate the fact that ALL the energy used to produce their solar heated water comes from the sun, and none from the electrical grid that delivers electricity generated by environmentally damaging technologies.


The Solar Pump™ is also the perfect pump for low-flow irrigation and general water pumping. It can be used to pump most liquids, including water and water/glycol solutions. 


Solar Pump Curves

P24070 (0.3 - 2.4 LPM / 0.1 - 0.6 USGPM)

P50140 (1.0 - 5.0 LPM / 0.3 - 1.3 USGPM)

P118330 (2.0 - 12.0 / 0.5 - 3.2 USGPM)


Port Sizes:

  • 3/8" FPT (P24070 & P50140)
  • 1/2" FPT (P118330)


Should your application require fittings or hoses of a different size, metric or imperial, substitutions are possible. Please contact us for more information.


"Finally! A solar water heater that is 100% solar powered - the way it should be." - customer


Direct Drive Solar Pump™ with Differential Temperature Control

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