I think 'Go Solar' would be the best one to answer your question here.
But to put it in a nutshell if you have a gravity fed water system then you can get by with a gravity or low pressure solar unit. In other words, if you have a tinaco or water tank on your roof and it is not a pressurized system then you can use a low pressure or gravity fed solar hot water unit.
But if you have a pressurized water system then you need a solar unit that can handle the water pressure, and those are more expensive. I don't believe they are 4 times more expensive, more like twice as expensive. But either way in this sunny climate solar is the way to go.
High vs Low Pressure Solar Water System
in Ajijic/Chapala/Guadalajara
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