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.

595444 3 4 Clip On Uastat Trol 595444

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Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌟 Cut energy waste, boost comfort—your circulator’s smartest upgrade yet!

EFFORTLESS INSTALLATION - Clip-on design fits 3/4-inch pipes—no complex setup required.
ENERGY SAVING AUTOMATION - Reduces pump run-time by up to 90%, slashing electricity bills and carbon footprint.
SMART TEMPERATURE CONTROL - Automatically stops circulator above 105°F and restarts below 85°F for optimal efficiency.
SEAMLESS TIMER INTEGRATION - Works perfectly with timer controls for customized heating schedules.
DURABLE STAINLESS STEEL BUILD - Engineered for longevity and reliable performance in any HVAC system.

The Grundfos 595444 3/4-Inch Clip-On Aquastat Control is a precision temperature sensor that automatically manages your circulator pump by switching it off above 105°F and back on below 85°F. Designed for easy clip-on installation on 3/4-inch pipes, it integrates seamlessly with timer controls to maximize energy savings and system efficiency. Built with durable stainless steel, this device significantly reduces pump run-time—proven to cut energy use by up to 90%—making it a must-have upgrade for modern, eco-conscious HVAC setups.

Specifications

ASIN	B0029P2WY6
ASIN	B0029P2WY6
Brand Name	Grundfos
Color	Black
Customer Reviews	4.3 4.3 out of 5 stars (80)
Customer reviews	4.3 4.3 out of 5 stars (80)
Date First Available	11 August 2013
Global Trade Identification Number	00632514046061
Is Discontinued By Manufacturer	No
Item Dimensions L x W x H	20.3L x 17.3W x 1.5H centimeters
Item Weight	0.15 Pounds
Item model number	595444
Manufacturer	Grundfos
Manufacturer	Grundfos
Material Type	Stainless Steel
Model Number	595444
Power Source	Ac/dc
Product Dimensions	20.32 x 17.27 x 1.52 cm; 68.04 g
Product Style	Circulator
UPC	632514046061
Unit Count	1.0 Count

Reviews

B**P

Works well to run my circulator pump.

23.01.2019

S**.

I can't believe I used my recirculation pump for years without this! Why run the pump when you already have hot water throughout the system? Adding this has reduced pump run-time by probably 90% for us. We do have the hot water and return lines fully insulated, which helps, and live in CA so temps aren't extreme, so your experience may vary. What a huge savings in pump run time and electricity usage. I calculate that this pays for itself in well under a year. It would be nice if you could tune the temperature, but this is really a minor point, perhaps for a future improvement.

20.03.2015

M**I

Very good product. Does the task

31.10.2018

E**N

GREAT PART

12.12.2025

M**P

Easy instructions and straightforward setup. Runs as it should.

21.03.2023

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