... in side 2.Pre-heated pressure system need pressure Pre-heated pressure system, Pre-heated, solar hot water1. Pre-heated pressure ... rapid heat transfer 2. Reliable, efficient, twin-glass solar tubes 3. Designed to accept mains pressure cold water 4. ... 10L, 20L, 30L, 60L, 100L, 150L etc.Pre-heated pressure system, Pre-heated, solar hot waterBrand nameSUNTASKProduct nameThermosyphon Unpressurized Solar ...