Thermomax - they operate differently than the other collectors available on the market. These solar collectors consist of a heat pipe inside a vacuum sealed tube. Solar energy is concentrated on the top of each tube and diverted through a manifold to a storage tank or load. Abbeyview Plumbing & Heating have a lot of lead work experience but one of our more complex customers was a local Church of Ireland Church. We recently gave Holly Mount Church a face-lift with some new lead flashing.