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Can solar tubes be installed in an existing south Florida barrel style roof?

I believe the roof is cement barrel. I am thinking of purchasing a house with this style roof and want to add more natural light. Is it possible?
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Can I replace Velux flexible tubes with rigid after installation?

My roofer has just installed three Velux sun tunnels. One will have a rigid tube, once the parts are delivered (it was broken in the box). The other two are flexible and I have pulled the tubing as ...
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Solar water heater size

I want to build my own solar water heater. It should heat about 20-30l of water per day to about 60°C. There is about 4-5h of direct sunlight to the place I thought of putting it. How big should my ...