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Series 200 - Drainback

Series 200 - Drainback
Series 500 - glycol
SDHW Design
SDHW Installation
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Series 200 Drainback SDHW System (currently discontinued)

Click for downloadable Brochure

Click for downloadable Data Sheet

The Series 200 System, as with Series 500, consists of 48 square feet of panel in either two 2x12 or three 2x8  panels.  This system uses a polymer drainback tank to protect the solar loop from harm due to freezing conditions.  It is a failsafe design in that the water in the panels and solar loop piping will drainback to the safe reservoir whenever freezing conditions occur, when there is a power outage that often can coincide with freezing rain events, or when there is not sufficient solar radiation to justify collection. 


  • Lightweight flexible solar collectors
  • Freeze tolerant drainback design
  • Simple user interface
  • Cannot overheat 
  • Easy to install
  • Everything is provided in one simple box:








Design Configurations:

  • Single tank system (shown below with four panels and two drainback tanks)
    • System can be connected to existing water heater with electric back-up for smaller families or to a larger single electric water heater.
    • This confirguration cannot be used with gas water heaters (natural, propane or LPG) since they heat from the bottom up not allowing stratification of cold incoming water needed for solar do effectively heat the water and reduce the gas burner operation.
  • Dual tank system
    • This configuration must be used with gas water heaters where solar preheats water in the storage tank that then feeds into the water heater reducing the burner operation.
    • Can also be used with electric water heaters to verify solar function and/or to increase solar volume
  • Single tank with instantaneous (tankless) gas water heater
    • Again, solar tank preheats tankless water heater reducinging burner operation

    click on pictures below for larger view




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