I am researching solar water systems for my South Florida home. I am looking at an open loop flat plate system utilizing my current electric hot water heater as a storage tank. I estimate I will need at least 30 sqft of collector. I have found a used 48 sqft unglazed pool collector for almost nothing on craigslist. This could save me $800-$900 over a new glazed collector. Do you think an unglazed collector can get the water hot enough for home use?