Todd, They have an integral pressure switch. It's adjustable via a single screw, but the spread (between cut-in and cut-out) is not. 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. 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. Allan -----Original Message----- From: Todd Cory [mailto:[EMAIL PROTECTED] Sent: Thursday, November 13, 2008 7:24 PM To: [EMAIL PROTECTED]; RE-wrenches Subject: Re: [RE-wrenches] tankless hot water and pumping question
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? Todd Allan Sindelar wrote: Todd, 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. Allan <!--[endif]-->
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