vacuum tubes ,high pressure system,for solar collector and sperated solar water heater,resist higher temperature in summer
vacuum tubes
1. high pressure system,for solar collector and sperated solar water heater
2. resist higher temperature in summer , reach 280degree.
3. thickness of it: 0.5-0.7mm of copper
4. powder is option.
5. warranty for 25 years.
6. good work in cold weather, even under -45degree in winter
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