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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⚡ Elevate your home system with silent, sleek power!

COMPACT YET POWERFUL - 1/8 HP motor delivers efficient circulation without bulk
UNIVERSAL COMPATIBILITY - 1-1/4 inch union fitting fits seamlessly into existing systems
LIGHTWEIGHT SPACE SMART - Only 2.36 kg with sleek dimensions, perfect for modern setups
PLUG AND PLAY CONVENIENCE - Includes line cord for easy installation and immediate use
PRECISION STAINLESS STEEL BUILD - Durable corrosion-resistant pump housing for long-lasting performance

The GRUNDFOS UP15-29SU/LC 59896776 is a compact, stainless steel circulator pump featuring a 1/8 HP motor and 115V power supply. Designed for durability and easy installation, it includes a 1-1/4 inch union fitting and line cord, weighing just 2.36 kg. Ideal for efficient, reliable home water circulation with a modern, space-saving design.

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Brand	Grundfos
Model Number	59896776
Product Dimensions	0.2 x 15.24 x 17.78 cm; 2.36 kg
Color	ホワイト
Name List for Name Plates	サーキュレーターポンプ
Material	ステンレス鋼
Power Source	バッテリー式
Voltage	115 Volts
Are Batteries Included	No
Item Weight	2.36 Kilograms

GRUNDFOS UP15-29SU/LC 59896776

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