what is the min/max cfm rating?

You would need to convert GPH to CFM. I have 3 8inch air stones running off my 1750gph in a 6ft deep pond.

Does this have any listed warranty? After using it for only a couple months it has stopped working.

These pumps are very inexpensive, so they don't come with a warranty that I know of. At roughly $30.00 per pump a couple of months is pretty inexpensive. Most will work longer. Still, the pump only cost you $15.00 a month. That's only $.50 per day. That's not bad. SB

Would the 18 watt pump be too much for a 150 gallon aquarium?

it will be just fine ! the pump comes with a manifold so you can adjust how much air you want from each separate outlet , i'm using it on a 125 g . (they are not quiet )

Colour	Silver
Brand	AquaMiracle
Material	Aluminium
Item Weight	7.1 Pounds
Product Dimensions	22.8L x 11.8W x 13.5H Centimeters
Power Source	AC
Air Flow Capacity	6600 Liters Per Hour
Maximum Pressure	32 Kilopascal
Operation Mode	Semi-Automatic
Voltage	120 Volts
Manufacturer	AquaMiracle
Wattage	120 Watts
UPC	757249909808
Item model number	ACO006
ASIN	B08H28HXFR

AquaMiracle Aquarium Air Pump Commercial Air Pump with Aluminum Housing, 120W/1750GPH Fish Tank Bubbler Pond Aerator for Aquariums, Ponds, Hydroponics

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