Check the listing for details. Vacuum Tube Solar Pool Water Heater with Stand. Condition: New. Listed at 1185.46 USD. Duda Solar Pool Collectorsby Duda EnergyΦ58mm x 1800mm Vacuum TubesSolar water pool collectors are unpressurized solar collectors meant to heat the pool water directly. Cold water enters into the manifold from the pool, sinks to the bottom of the tube, and once heated a little bit, will rise back up to the top of the manifold and exit with the water flow. Pool collectors are the most efficient way to heat water because they come in direct contact with the heated surface in the tube and operate at low temperatures which will allow for minimal heat loss through the tubes and manifold, if any at all.These solar collectors have an inner manifold material made of 316L stainless steel. 316L stainless steel helps hold up against chlorinated water better than other metals, and typically lasts for about 15 years under normal usage, depending on how much chlorine content is present. When the manifold begins to leak due to failure from corrosion, the manifold can be replaced with a new one and the system may continue to be used.Each 30 tube collector ships with an additional 10 spare tubes for freight breakage insurance. Extra tubes that make it unbroken may be kept by the customer as spares free of charge.Because pool collectors fill directly with the working water, they are not winter resistant. They can survive some freezing temperatures, but should be taken apart or drained and covered during non-use seasons. Tubes which are left dry in the sun cannot be filled with water while they are hot or they will suddenly burst due to rapid cooling caused by water.We recommend using these collectors with a controller and pump. When a controller is present, the water can be circulated to collect the heat. This is the most efficient method. Alternatively, a timer setting can be used to run the pump when the sun is out. Or the pool pump which filters the water can have a small bypass which sends water through the collector prior to returning to the pool and heat will be collected whenever it is available.Manufacturer's Warranty Period:All of our solar products come with a manufacturer's warranty. A manufacturer warranty covers materials defective due to the manufacturing process. If a manufacturing defect is discovered during the manufacturer's warranty period, the item may be returned to Duda Energy for repair or a replacement. Only materials found defective due to manufacturing will be replaced under the warranty. The warranty does not cover natural phenomenons such as corrosion. The manufacturer's warranty period does not designate the expected lifetime for a material, unit or device. It only applies a limited time period in which defects due to manufacturing may be eligible for a claim. Solar Collector Warranty Period: 3 Years Parts Included:Solar collector manifold30 x Φ58 x 1800mm Long Vacuum Tubes10 Spare Vacuum tubes (for breakage insurance during freight transit, extras may be kept by customer as spares)Mounting gear with 37° Inclined stand for Flat Roof / Ground installation (May be mounted to a roof by use of additional parts or fixtures such as 2 x 4's)Tube holders for connecting the bottom of the tubes to the bottom rack of the frame.Hex Bolts & Nuts / Hardware Unpressurized Solar Water Pool Collector Specifications Inner manifold material SS316L Thickness of interior shell 0.4mm (0.016") Outer shell material of manifold Zinc Coated Steel Thickness of exterior shell 0.4mm (0.016") Frame material Aluminum Alloy Thickness of Frame 1.8mm (0.07") Material of Windproof Seal Rubber Optional installation angle 38° Vacuum tube φ58mm, Length:1800mm Hailstone resistance