... heating. Evacuated tubes have already been used for years in USA,Germany, Australia, France, Japan, Canada, China ,the UK, Chile, ... is chosen for its reliability, performance and low manufacturing cost.Part 1. Advantages1. Excellent performance of absorbing, but low heat ... one being the level of evacuated radiation (insolation) in your region.Part 2. Evacuated Tube Basic Specifications 1800*58mm/1500* ...