We have the tracking almost under control but my question here is about the receiver which should be placed at the focus of the parabola. The heat fluid should go through "spiraling" pipes in the receiver, get heated and then go back to the water tank in the house. Does anyone know where to buy such a receiver (even second hand)? if not, can anyone help us on how to build it (material, dimension, etc).
I didn't find the right solution from the Internet.
References: edited by moderator, references out of topic / commercial