The Perfect Solar Geyser!

This is the most affordable kind of Solar Geyser, since a Low Pressure tank is much easier to manufacture. The water flows through the tubes, so no expensive heat pipes and manifold is required to transfer heat.

The other advantage is that bursting will never be a problem again. No flooded ceilings and damaged furniture.  A longer lifespan than any other geyser!

But what does "Low Pressure" actually mean?