1/4 Hose Or 3/8

[justaguy]

1/4 inch hose too small or does it matter?

[Stratous]

1/4 should be just fine unless your producing alot of hho

[stickittoopec]

A 1/4 " hose is all you will ever need for this. Maintain 1 psi and it will put out 6.8 cfm (192.6 liters). If you can do that with one of these small units we need to see your design you have the golden nugget. In reality we will see inches of water column.
Source :Pocket Ref. 3rd edition.