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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Grundfos 595444-3/4" Clip-on Aquastat Kit for UP Series Circulators, 85-105F

Product ID: 8390179

Details

Brand
Grundfos
Color
Black
Global Trade Identification Number
Item Weight
2.4 ounces
Manufacturer
Grundfos
Material
Acrylonitrile

🔧3/4-inch clip-on pipe mount

⏲️Compatible with timer controls

🌡️85-105°F precision range

¥18925

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

EFFORTLESS INSTALLATION - 3/4-inch clip-on design mounts directly on your pipe—no hassle, no mess.
DURABLE ABS CONSTRUCTION - Built to last with high-quality Acrylonitrile Butadiene Styrene material for reliable performance.
ENERGY SAVING AUTOMATION - Prevents overheating by shutting off circulator at 105°F, saving energy and extending system life.
SMART TIMER COMPATIBILITY - Seamlessly integrates with timer controls to customize your heating schedule.
PRECISION TEMPERATURE CONTROL - Automatically toggles circulator between 85°F and 105°F for optimal heating efficiency.

The Grundfos 595444 Clip-on Aquastat Kit is a precision temperature control device designed for UP Series circulators. It mounts easily on 3/4-inch pipes and automatically switches the circulator off when water temperature exceeds 105°F, turning it back on below 85°F. Compatible with timer controls and constructed from durable ABS, it optimizes heating efficiency while preventing overheating.

Specifications

ASIN	B0029P2WY6
Best Sellers Rank	#235,457 in Automotive ( See Top 100 in Automotive ) #24 in Automotive Replacement Engine Turbocharger Boost Controllers
Brand Name	Grundfos
Color	Black
Customer Reviews	4.3 4.3 out of 5 stars (83)
Global Trade Identification Number	00632514046061
Item Dimensions L x W x H	8"L x 6.8"W x 0.6"H
Item Weight	2.4 ounces
Manufacturer	Grundfos
Manufacturer Part Number	595444
Material Type	Acrylonitrile Butadiene Styrene (ABS)
Model Number	595444
Number of Items	1
Power Source	Corded Electric
Product Style	Circulator
Specific Uses For Product	Heating systems, hot water lines
UPC	632514046061
Unit Count	1 Count

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¥18925

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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