gas wall-hang boiler double pipe heat exchanger

Features : 

1.Raw Material : copper tube , aluminium fin , galvanized plate and stainless steel plate 

2.Size of copper pipe: diameter:7mm, 12.7mm, 9.52mm ,Inner Grooved Or smooth tube . 

3.Aluminum foil : Hydrophilic or bare 

4.Fin type :Louver Fin , Flat fin , corrugated fin 

5.Pitch of fins can be adjusted between 1.5-8mm 

6.Pitch of holes and pitch of rows:19.1*16mm,21*21.7mm,21*19mm.etc 

7.No less than 3.0mpa air pressure (nitrogen)leak test

8.We can offer customized service as well