info@sanmaksolarsystems.com
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SANMAK SOLAR
SYSTEMS INC
Products and Services
Free Flow System: widely accepted no
moving parts, flows by thermo-syphon ,
reliable, simple, no maintenance.
Drain-back system is indirect heating as sun
heat fluid which in turn heat water by heat
exchanger. It is used in all climates. When
no sun fluid drains back to reservoir tank
Direct System
has a small PV used in
circulating water for
heating