does this unit have a check valve?

I don’t believe it does. Our plumber installed a separate, dedicated check valve elsewhere in our hot water loop.

Can this replace a 59896777 model?

You can call Grundfos or their reps but it could take days for them to return the call , that was my experience. The 5989676 is the same pump as the 5989677 without the timer or the check valve. If you have a need or desire for the timer get the "77" model the check valve is a nice to have feature but not essential and I already had on inline so the "76" pump worked fine. All specs otherwise are the same EXCEPT the water temp can be hotter if you do not have a timer. In household applications you should have the water hotter then 115F anyway so either pump is fine. Use this link to see all the detail and a table comparing the features. https://us.grundfos.com/products/find-product/circulators.html#brochures click on the UP(S) brochure. FYI these are not general hard to install but a good plumber can do it in less than an hour especially if they're swapping one out.

Is a stainless steel unit such as this able to be used in an open loop radiant system?

this unit will be able to do the pumping but there are so many other factors to consider you need to consult the engineer who designed the system.

which of the grunfos hot water recirculating pump has a brass impeller

Hi, I believe that model is # 595916. Although there are several, this is the most common.

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Grundfos Up15-29Su/Lc 59896776

Product ID: 293324700

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🔌115V efficient voltage

⚙️1/8 HP motor power

🛡️Durable stainless steel build

Description

⚡ Elevate your system’s flow with precision and style!

COMPACT YET MIGHTY - Sleek 7" x 7" x 6" footprint fits seamlessly into tight spaces without compromising power.
PLUG PLAY CONVENIENCE - Comes with a pre-attached line cord for effortless installation and immediate use.
TRUSTED BRAND RELIABILITY - Grundfos engineering excellence means peace of mind for your heating or cooling setup.
PRECISION CIRCULATION POWER - Optimized 1/8 HP motor ensures reliable fluid movement for your system.
ROBUST STAINLESS STEEL DESIGN - Corrosion-resistant housing guarantees long-lasting performance and durability.

The Grundfos UP15-29SU/LC is a compact, stainless steel circulator pump featuring a 1/8 HP motor and 115V power supply. Designed for efficient fluid circulation, it includes a convenient line cord and a 1-1/4" union connection, making it a durable and easy-to-install solution for professional-grade heating and cooling systems.

Specifications

Manufacturer	Grundfos
Part Number	59896776
Product Dimensions	0.2 x 15.24 x 17.78 cm; 2.36 kg
Item model number	59896776
Size	7" x 7" x 6"
Colour	White
Style	Circulator
Material	Stainless Steel
Voltage	115 Volts
Item Package Quantity	1
Batteries included?	No
Batteries Required?	No
Item Weight	2.36 kg

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