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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Description

🌡️ Stay in control, stay ahead—heat smarter, not harder!

EFFORTLESS INSTALLATION - Clip-on design fits snugly on 3/4-inch pipes—no hassle, no mess
ENERGY SAVING AUTOMATION - Prevents overheating by shutting off circulator, reducing energy waste and costs
SMART TIMER COMPATIBILITY - Seamlessly integrates with timer controls for customized heating schedules
DURABLE STAINLESS STEEL BUILD - Engineered for longevity and reliable performance in demanding HVAC systems
PRECISION TEMPERATURE CONTROL - Automatically toggles circulator between 85°F and 105°F for optimal efficiency

The Grundfos 595444 3/4-Inch Clip-On Aquastat is a precision temperature control device designed to automatically regulate hot water circulators by switching off at 105°F and back on at 85°F. Its clip-on mounting system fits 3/4-inch pipes for easy installation and can be used alone or paired with timer controls. Crafted from durable stainless steel and powered by AC/DC, it ensures efficient, energy-saving operation in HVAC systems.

Reviews

M**P

Works like a charm

Easy instructions and straightforward setup. Runs as it should.

21.03.2023

B**P

Works good

Works well to run my circulator pump.

23.01.2019

A**R

Good aquastat. BUT...

Given its advertised as the companion to a hot water circulator pump I expected its control temp would be close to one size fits all.NOT SO.No matter where I placed it in the loop, on-time For the pump was 20+x longer than needed for hot water to flow at the faucet.My choice in system control is a user initiated button. The aquastat was to limit pump on if the pipes were already warm and shut-down the pump once it got hot enough.Required on time for my pump was only 10sec. for water to be hot at the faucet. At normal flow it would take 60 sec + 1/2 gal of water wasted before it was useably hot. The aquastat would allow for a 4 min. run time.A count-down control timer relay is the solution for my system. (Maybe your system too)HTH! :)

20.07.2020

M**I

Very nice

Very good product. Does the task

31.10.2018

E**H

Quality product but it works on a specific serial number ...

Quality product but it works on a specific serial number range of pumps which is not listed in the advert.

27.03.2017

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Manufacturer	Grundfos
Part number	595444
Item Weight	68 g
Product Dimensions	20.32 x 17.27 x 1.52 cm; 68.04 g
Item model number	595444
Color	Black
Style	Circulator
Material	Stainless Steel
Power source type	Ac/dc
Item Package Quantity	1
Batteries Included?	No
Batteries Required?	No

Grundfos 595444 3/4 Clip On Uastat Trol 595444

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