SIASUN was jointly invested by the Shenyang Institute of Automation, Chinese Academy of Sciences, Dalian Institute of Chemical Physics, etc., and in 1993, Dalian Institute of Chemical Physics successfully developed China's first small medical oxygen machine. The strong national technical background has enabled it to obtain a number of national patents in oxygen generator technology.
 
SIASUN S80, as an 8L ultra-large flow model, controls the weight at 24kg, has strong mobility, and optional atomization function, suitable for home use. The average operating noise of 48dB can be a bit noisy at night, but it is still a little quieter than the sub-optimal Newlife Intensity.
 
ots-5 and Philips Everflo are very similar - shape, volume, weight and other parameters are almost the same, the same sky blue paint is more "out of the same door", the price is 5480 yuan. The S50 performance parameters of the same 5L oxygen concentrator are not much different from ots-5, but the weight is nearly twice as high, and it is inconvenient to move, and its price is only 300 yuan lower than ots-5, which is not as good as ots-5 worth buying.
 
SIASUN 3L oxygen concentrators S30 and G30 are more than twice as heavy as Philips and Yuyue 3L products of about 12kg, and there is no remote control function, which is inconvenient to use. The lowest price of these two machines is 3300 yuan, which is a little more expensive than the Philips K3B-PH, which is also a 3L oxygen concentrator and has stronger performance, and it is not recommended to buy.
 
As a domestic portable oxygen concentrator, SIASUN POC-5's performance is not bad. Although compared with similar products of Asia and Inogen, the oxygen flow rate can be reduced and the battery life is relatively short, but because many portable oxygen concentrators of Asia and Inogen are not listed in China, the competitiveness of POC-5 priced at 15,000 yuan in the domestic market is not weak.