which would be better of the 2?

[batang_mcdo]

which would be better for aquarium use? tanks would be outdoors, so no problem if a little noisy.
http://www.resun-china.com/en/Produc...2&ProClass=133

Resun

MODEL：ACO-001


VOLT. ：100~120V 220~240V
FREQ. ：50/60Hz
CURRENT：0.20/0.11A
POWER：18W
PRESSURE：0.020MPa
AIR FLOW：0.038 m3/min
DIA.OF OUTLET：8mm
SPEC. OF DIVIDER：4
WEIGHT：1.0kg/pc
DIMENSION：180×95×115mm


FEATURE
a. Convenient to operate and no oil lubricant needed.
b. Strong and durable cylinder and piston result in high pressure and energy saving
c. Air dividers included
d. Widely used in fish farms, sea food restaurants and aquariums for oxygenation purpose


or

MODEL：LP-20(In plastic cover)


VOLT. ：100~120V 220~240V
FREQ. ：50/60Hz
POWER：17W
AIR FLOW：1500 L / Hr 400GPH
PRESSURE：0.028Mpa
AIR STONE'S MAX DEPTH IN WATER：2.2m
AIR DIVIDER OUTLETS：6


FEATURE
a. Impact-resistant rubber diaphragm and valve ensure long life
b. Unique structure with good heat dispersion and low noise
c. Widely used in fish farms, ponds, aquariums and industry uses for oxygenation purpose
d. Plastic air dividers included, and metal dividers available upon request

usage will be maybe to power air disk, or airstones , depth of aquariums is 2 -2.5 feet?

 

[administrator]

ACO-001

piston vs diaphragm

 

[batang_mcdo]

thanks so Piston would be more efficient?

 

[administrator]

Generally speaking they are longer lasting and involve less maintenance. Plus they usually are more powerful. Check these guys out as well. Read the notes at the bottom about the various pumps. I love Jehmco.

http://www.jehmco.com/html/central_air_pumps.html

 

[batang_mcdo]

Generally speaking they are longer lasting and involve less maintenance. Plus they usually are more powerful. Check these guys out as well. Read the notes at the bottom about the various pumps. I love Jehmco.

http://www.jehmco.com/html/central_air_pumps.html

thanks I thionk the resun I posted is different from the linear air pumps.
the compressor i posted is really noisy and generates a lot of heat.