1) low pressure solar collectors 2) enamel manifold pipe 3) three target vacuum tube 4) 5 years warranty time

   low pressure solar collectors 

  

Model: WTO-LCP
Low pressure vacuum tube solar Collector with Porcelain enamel manifold case
1) Manifold case (outer)	Aluminium alloy	Oblong type casing
Manifold pipe (inner)	Titanium steel	Thickness:1.2mm
Manifold pipe (inner)	Poecelain enamel coating	Thickness:0.5mm
Insulation	Rock wool	Thickness:110mm
2) Solar glass tube	Three target vacuum tube	58/1800mm
3) Frame	Aluminium alloy	Thickness:2mm
4) Inlet/Outlet	3/4 inch	Optional:1"
5) Packing	Export carton	Wooden for sample
6) Warranty time	5 years

It is better for some area whose water quality is not so good like hard water.

Welcome to your DIY and OEM requests if you have.