EcoInnovation has been testing 5 of these low cost low pressure solar hot water heating systems. We still have some test work to complete but have found them to be surprisingly good and able to boil water on clear winters days- something a flat plate collector does not do. No wonder 10% of the Chinese population is using solar glass tubes collectors – good on them! We will have these items for sale soon once we have completed our test program. Unit has 200 liter stainless steel tank, 24 glass vacuum tubes and frame. Only suitable for very low pressure. We will not be getting them approved to NZ standards. Buy our other product if you want NZ standard approval. We are of the opinion that these will find a market for those wanting to heat outside kiwi baths, hot tubs and for buildings that do not have/need permits or where the owner is not concerned about such issues. Collection only from New Plymouth depot – no freight. Bring your trailer.