Re: [Killietalk] PVC air manifold vs. lots of airline tubing

["Bill Shenefelt" <william_shenefelt at verizon.net>]

The  smallest Jehemco linear is $189 and consumes 32 watts.  Your double 
piston is 75 watts.  (not sure of its volumetric output versus the linear 
though.  For 43 watts (at 16 cents a KWH) to cost $189 it will take 3 or 4 
years   Figure a kilowatt hour a day saved.    Much nicer pump though. 
Almost inaudible.  Operational costs for the linears is about half of other 
pumps of similar capacity.  Other than operational cost, the biggest 
difference between a piston and a blower for bigger fishrooms is the 
forgiveness for overdrawing air.  A piston pump is a unit that tries to pump 
a volume.  Once you reach that volume, the pressure dies quickly with each 
additional outlet.  A blower has a gradual decline in pressure as you 
increase the number of outlets past its maximum anticipated load.  If you 
know for sure the maximum number of outlets, a linear is great.  If you keep 
expanding after you buy it, you may need to add another in short order. 
Moral is :  Buy one a lot bigger than you need if you go linear and ever 
anticipate expanding the fishroom.
Bill Shenefelt
http://sheneskillies.com 


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