Compact non pressure solar water heater relies on the nature circulation of the water between solar tubes and the water tank.Thermosyphon systems work on principal of heat rising. The water enters in the bottom of the collector and rises to the tank as it warms. The advantage of this system is that solar heat is stored in a well-insulated tank, so hot water can be used at any time without the penalty of overnight losses. Moreover the insulation of the tank can protect heat during 3 days without heat loss. Our services 1. Packing: Standard export carton with foam or wooden box, Wooden Box Packing for Sample 2.Shipping: 7 days for sample, 7-10 days for 20/40 container 3.MOQ: Sample is available 4.Warranty: 5 years guarantee for whole set solar water heater 5.Port of departure:Shanghai or Ningbo 6.Supply ability: 6000 sets per month 7.life time : more than 20 years Product Introduction Item no Diameter of outer tank Diameter of inner tank QTY of tube Diameter of tube Length of tube Effective light area Tanks capacity Application people ZY-1NA-5808 460mm 360mm 8 58mm 1800mm 0.83 80L 2 ZY-1NA-5810 460mm 360mm 10 58mm 1800mm 1.04 100L 2-3 ZY-1NA-5812 460mm 360mm 12 58mm 1800mm 1.25 120L 3 ZY-1NA-5815 460mm 360mm 15 58mm 1800mm 1.46 150L 3-4 ZY-1NA-5818 460mm 360mm 18 58mm 1800mm 1.87 180L 4 ZY-1NA-5820 460mm 360mm 20 58mm 1800mm 2.08 200L 4-5 ZY-1NA-5824 460mm 360mm 24 58mm 1800mm 2.5 240L 5-6 ZY-1NA-5830 460mm 360mm 30 58mm 1800mm 3.13 300L 6 ZY-1NA-5836 460mm 360mm 36 58mm 1800mm 3.75 360L 6-7 ZY-1NA-5840 460mm 360mm 40 58mm 1800mm 4.17 400L 7-8 ZY-1NA-5850 460mm 360mm 50 58mm 1800mm 4.69 500L 8-9 1. Material of inner drum board: SUS304 0.31MM, outer diameter 460MM 2. Material of outer barrel board: color steel, inner diameter 360MM 3. Insulation layer: 5 cm 4. Bracket: 201 round tube bracket 1.0MM, angle 27 degrees FAQ Q: Are you a manufacture or trading company? A: We are a manufacture special for solar water heater. Q: Which payment way you accept? A: Paypal, Alipay, T/T, L/C ,D/P. Q: What's the MOQ? A: For trail sample order, 1pcs is available. Q: What's your delivery time? A: 7-10 working days after receipt of signed PI and down payment Q: What is your package ways? A: Generally, standard products with standard package. Inside: plastic foam. Outside: cartons Q: Do you have other ADDITIONAL SERVICE? A: YES We could offer other accessories (cover side/ support / solar water heater controller /silicon seal /rubber seal ) used on solar water heater system and the price will be much competitive.