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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🔥 Stay in control, stay ahead with Grundfos precision!

COMPACT LIGHTWEIGHT - Slim 20.3 x 17.3 x 1.5 cm profile at just 0.15 lbs fits anywhere
EFFORTLESS INSTALLATION - Clip-on design mounts directly on your pipe—no hassle, no fuss
TRUSTED BRAND RELIABILITY - Grundfos quality ensures durable, long-lasting HVAC control
SEAMLESS TIMER COMPATIBILITY - Works perfectly with timers for smart, scheduled heating
PRECISION TEMPERATURE CONTROL - Maintain optimal 85-105°F for efficient heating

The Grundfos 595444 3/4-Inch Clip-On Aquastat Control is a compact, lightweight HVAC thermostat designed for precise temperature regulation between 85 and 105 degrees Fahrenheit. Its easy clip-on mounting system fits directly on pipes, enabling quick installation and compatibility with timers for automated heating control. Engineered by Grundfos, this reliable circulator-style aquastat ensures efficient and consistent heating performance in professional and residential settings.

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Brand	Grundfos
Style	Circulator
Product Dimensions	20.3L x 17.3W x 1.5H Centimeters
Item Weight	0.15 Pounds
Global Trade Identification Number	00632514046061
Manufacturer	Grundfos
UPC	632514046061
Item model number	595444
ASIN	B0029P2WY6

Grundfos 595444 3/4-Inch Clip-On Aquastat Control

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