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.

Grundfos Up15 29su Lc 59896776

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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MX$28119

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Sold byAmazon MexicoDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚙️ Elevate your flow game with silent, stainless steel power!

THERMAL TOUGHNESS - Operates seamlessly in liquids up to 230°F, perfect for hot water systems.
PLUG PLAY INSTALLATION - Comes with line cord and 1-1/4" union for hassle-free setup.
WHISPER QUIET EFFICIENCY - Ultra-quiet operation keeps your space peaceful and professional.
HIGH PRESSURE PERFORMANCE - Handles up to 145 psi to meet demanding circulation needs.
BUILT TO LAST STAINLESS STEEL - Durable AISI 304 housing resists corrosion for long-term reliability.

The Grundfos UP15-29SU/LC is a premium stainless steel circulator pump featuring an 87W canned rotor motor with no shaft seal, ensuring minimal maintenance and quiet operation. Designed for durability with corrosion-resistant materials and capable of handling liquid temperatures up to 230°F and pressures up to 145 psi, it offers easy installation with a 1-1/4" union and built-in line cord. Ideal for professional-grade hot water circulation with proven reliability and efficiency.

Specifications

ASIN	B003A6WUGI
Best Sellers Rank	#538,493 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #703 in Power Water Pumps
Color	White
Customer Reviews	4.5 4.5 out of 5 stars (159)
Date First Available	November 12, 2010
Item Package Quantity	1
Item Weight	5.19 pounds
Item model number	59896776
Manufacturer	Grundfos
Material	Stainless Steel
Part Number	59896776
Power Source	Corded Electric
Product Dimensions	0.08 x 6 x 7 inches
Size	7" x 7" x 6"
Style	Circulator Pump
Voltage	115 volts

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