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 | Desertcart South Africa

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Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Elevate your home’s flow with power and precision!

PLUG PLAY - Comes with a convenient line cord for easy installation and immediate use.
BUILT TO LAST - Robust stainless steel construction ensures long-lasting durability and corrosion resistance.
PRECISION POWER - 1/8 HP motor delivers reliable, energy-efficient circulation for your home systems.
COMPACT EFFICIENCY - Slim 1-1/4" union design fits seamlessly into tight spaces without compromising performance.
TRUSTED PERFORMANCE - Highly rated by professionals with a 4.6-star average from 147 reviews—join the satisfied users!

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 and durable home water circulation, it includes a 1-1/4" union and a convenient line cord for easy installation. Trusted by professionals and backed by strong customer ratings, this pump combines reliability with sleek engineering to keep your systems running smoothly.

Specifications

ASIN	B003A6WUGI
Are Batteries Included	No
Brand	Grundfos
Color	white
Customer Reviews	4.6 4.6 out of 5 stars (147)
Date First Available	September 9, 2014
Item Weight	2.36 Kilograms
Material	stainless-steel
Model Number	59896776
Name List for Name Plates	Circulator Pump
Power Source	Battery Operated
Product Dimensions	0.2 x 15.24 x 17.78 cm; 2.36 kg
Voltage	115 Volts

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