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<DIV><SPAN class=359473502-14112008><FONT face="Times New Roman"
color=#000000>Todd,</FONT></SPAN></DIV>
<DIV><SPAN class=359473502-14112008><FONT face="Times New Roman"
color=#000000>They have an integral pressure switch. It's adjustable via a
single screw, but the spread (between cut-in and cut-out) is
not.</FONT></SPAN></DIV>
<DIV><SPAN class=359473502-14112008><FONT face="Times New Roman"
color=#000000></FONT></SPAN> </DIV>
<DIV><SPAN class=359473502-14112008><FONT face="Times New Roman"
color=#000000>Re Bob's recommendation: my opinion is a bit different. Run a
pressure tank, but I don't see the need for a big one. The pump is cheap and
forgiving - put any tank on it, even a two gallon surge tank. Sure, it'll cycle
on and off, but it's made to do that, as it's an RV pump,
basically.</FONT></SPAN></DIV>
<DIV><SPAN class=359473502-14112008><FONT face="Times New Roman"
color=#000000></FONT></SPAN> </DIV>
<DIV><SPAN class=359473502-14112008><FONT face="Times New Roman"
color=#000000>The 3.3 gpm is peak, and goes down as pressure rises. Make sure it
works with your choice of tankless heater. I don't know the answer to that.
Certainly a large pressure tank(s) will allow you to exceed the pump's flow rate
until the PT reaches cut-in.</FONT></SPAN></DIV>
<DIV><SPAN class=359473502-14112008><FONT face="Times New Roman"
color=#000000>Allan</FONT></SPAN></DIV>
<DIV><SPAN class=359473502-14112008><FONT face="Times New Roman"
color=#000000></FONT></SPAN> </DIV>
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<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> Todd Cory
[mailto:toddcory@finestplanet.com] <BR><B>Sent:</B> Thursday, November 13, 2008
7:24 PM<BR><B>To:</B> allan@positiveenergysolar.com;
RE-wrenches<BR><B>Subject:</B> Re: [RE-wrenches] tankless hot water and pumping
question<BR><BR></FONT></DIV><FONT size=+1><FONT face=Arial>Thanks for the
recommendation. Does this unit need an external pressure switch or is that
integral? Does these work w/o an expansion tank or will they cycle on/off
excessively set up in a direct pumping
situation?<BR><BR>Todd<BR></FONT></FONT><BR>Allan Sindelar wrote:
<BLOCKQUOTE cite=mid2287FC0E18EA4930B599E0C6D0689B1D@AllanLaptop type="cite">
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<DIV><SPAN class=953590202-14112008><FONT
color=#000000>Todd,</FONT></SPAN></DIV>
<DIV><SPAN class=953590202-14112008><FONT color=#000000>The Shurflo 2088-24
(model 2088-474-144) is a reliable and cheap surface pump; tolerates sediment,
field rebuildable (until the motor brushes eventually wear out, but in this
app that could be many years) and retails aroud $125. About 2 gpm at pressure.
Not freeze-tolerant.</FONT></SPAN></DIV>
<DIV><SPAN class=953590202-14112008><FONT
color=#000000>Allan</FONT></SPAN></DIV></BLOCKQUOTE>
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