Will this work properly on pex, or does it need to be clipped on copper pipe?

Plastic is an insulator, so it does not transfer heat well. It may work, but not as designed. Why not replace a segment of the PEX tubing with a copper fitting? You would have better results.

Does the Aquastat connect directly to leads dedicated "aquastat" leads on the pump or is it in line with the main power supply to the pump?

It connects in-line with the main power, there is no relay or other switching at a lower voltage than the line (110V) voltage.

My timer has gone bad in my pump. Can I use this to replace the timer? Makes sense to me.

Depending on the application and required temp range needed. If the temp drops enough to allow the contacts to close and start the pump, and opens when the high temp is reached stopping the pump. The location, and temp range of the aqua stat may be very critical to proper operation.

We have a single circulator pump located on the return loop. Don't I want the circulator pump to operate until the water goes below a set temperature?

yes, this thermostat is "closed" until the temperature reaches 105 then it opens , the pump stops and when the temperature drops to 85 degrees it closes again to let the pump run.

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⚡ Elevate your system with the pump that means business.

DURABLE BUILD - Crafted from premium stainless steel and brass for long-lasting industrial strength.
SMART COMPATIBILITY - Includes Aquastat kit and supports timer use for automated, energy-saving operation.
SEAMLESS INTEGRATION - Mounts directly on your pipe for effortless installation and sleek setup.
COMPACT LIGHTWEIGHT - Slim 20.32 x 17.27 x 1.52 cm design weighing just 68g fits tight spaces without bulk.
PRECISION TEMPERATURE CONTROL - Operates efficiently within 85-105°F, ensuring consistent system performance.

The Grundfos 595444 is a compact, electric inline industrial water pump featuring a robust stainless steel and brass construction. Designed for above-ground pipe mounting, it operates efficiently within an 85-105°F range and includes an Aquastat kit for precise temperature control. Compatible with timers, this 3/4-inch pump delivers reliable performance in HVAC and industrial applications.

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Manufacturer	Grundfos
Part Number	595444
Product Dimensions	20.32 x 17.27 x 1.52 cm; 68.04 g
Item model number	595444
Colour	Black
Style	Above Ground
Material	Brass, Stainless Steel
Power Source	Corded Electric
Item Package Quantity	1
Batteries included?	No
Batteries Required?	No
Item Weight	68 g

Grundfos 595444 Black Inline Industrial Water Pump, Stainless Steel & Brass, 3/4-Inch, 85-105°F, Electric, Aquastat Kit, Mounts on Pipe, May be used with Timer

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