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A Passive System or an Active System?
The PASSIVE Progressive Tube Passive Solar Water Heater outperforms other systems - even in colder climates.

The best suited solar water heater systems for northern climates are the Active Closed-Loop and the Passive Systems. Research has shown that the Passive Progressive Tube is the most cost effective system even in cold climates:

Progressive Tube:
  • Purchase price and cost of maintenance is lower
  • Has the greatest return on your investment
  • Reduce hot water energy costs up to 100%

Progressive Tube
Closed Loop

Average Cost



Average operation per year

7-12 months

12 months*

Cost of operation savings per year



Investment return

25% per $1.00

15% per $1.00



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