Saving electricity - replacing an old pump/motor

[pauster]

Hi Mark,

I have your your input for some more extrapolations ... so for a sanity check (another one )

Pentail IntelliFlo

GPM Ft head KW gpm / kw (assume about const. efficiency per manuf info)
85 86 2.9478 29
65 50.7 1.318 49
50 30 0.600 83
45 24.3 0.437 103
40 19.2 0.307 130
35 14.7 0.206 170
30 10.8 0.130 231
25 7.5 0.075 333
20 4.8 0.038 521
15 2.7 0.016 926


Pentair 2 speed

high = 3450 rpm: 65 GPM, 1.676 kW, 39 gpm/kw
low = 1725 rpm: 35 GPM, .54 kW, 65 gpm/kw

The Pentair 2 speed would save me $208 per season, the Intelliflo $372 (see attched zipped Excel spreadsheet)

So it's just a question of how much the pumps cost and how long it takes to pay for itself.

I found the pentair for $421 online plus say $130 for a 2 speed switch - does that sound reasonable ?

If I can get the Intelliflo for $900 (supposedly, but I have to confirm with the dealer) then it makes more sense, if it costs more, the Pentair is what I'll use - but I'd have to run 230V to the pump (.

Thanks again for your patience !

Patrick