Can someone recommend current Z-Wave (Plus) wall outlet receptacles that function as a repeater, to strengthen my Z-Wave network? Want one controlled outlet, repeater functionality, strong compatibility with SmartThings, and that’s it. Energy monitoring is optional. I am looking for something currently manufactured and supported.
In general, mains powered devices work as repeaters. As @JDRoberts would say “What country are you in”?
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United States.
There’s a product, “Enbrighten Z-Wave In-Wall Tamper-Resistant Smart Outlet, White” 55256, that looks somewhat good however none of the specifications state that it functions as a repeater. Some reviews on Amazon indicate that it (or another product version) does not function as a repeater.
An exhaustive current Google search only yielded:
Leviton ZW15R-1BW: “Tamper-Resistant Outlet with Z-Wave Technology”. One controlled outlet, one always-on outlet. The guide DG-000-ZW15R-02A.pdf says: “Your outlet will act as a repeater in the network to increase the reliability of the network.”
I have found nothing else so far.
Any main powered devices except for some light bulbs should be repeaters.
Eaton makes Z-Wave Plus outlets in several colors which are sold by Lowes.
Here is a link to the Z-Wave certification for the 55257 which is variant of the same device. It shows it supports “Supports Z-Wave Beaming Technology? Yes” which means it’s a repeater. I own a bunch of the GE/Jasco/Enbrighten outlets and dimmers and they do act as repeaters.
https://products.z-wavealliance.org/products/3978/embedpicsd
In the US, all zwave plus or newer in wall outlets will act as repeaters. I can’t speak to current ST compatibility.
Being a Z wave repeater and supporting Z wave beaming technology are two different things, although all devices which support beaming will also be zwave repeaters, so that may be what you meant. But not all repeaters support beaming.
Zwave beaming technology is the answering service for battery operated locks. You need one of those pretty close to a Z wave battery powered lock, typically within about 12 feet. It then serves as the answering service for the lock, holding onto its messages until the next time the lock wakes up. Then delivering them. This is to prolong battery life in the lock. 
The zwave repeater designation means the device will pass along messages (but not hold them) to the next repeating device on the network until the message gets to the hub. Or its intended recipient.
On the official conformance statement, which will be posted on the Z wave alliance website when the device gets its Z wave certification, look for the “role type.“
If it is an “always on slave“ or AOS, or an “always on end node,” It is a repeater. Whether it supports beaming or not.
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Most, not all.
There are hardwired smoke detectors, for example, which do not act as repeaters because they don’t want to miss giving an alert because they’re busy passing along a message from a lightbulb.
There are also some hardwired locks which are not repeaters because they don’t want to interrupt processing the lock code.
The usual device classes for zwave repeaters are light switches, light bulbs, in wall outlets, and in-line relays. (There are Zigbee lightbulbs which don’t act as Zigbee repeaters, in particular, sengled, but I’m not aware of any Z wave lightbulbs that made that same decision. There might be some. 
)
Some main powered sensors are repeaters, some are not. 
Eaton product:
Lowe’s Item #1614055; Model #RFTR9605-TAW-BX-LW
or just RFTR9605-TAW. 15 amp receptacle. Interesting feature from an Amazon review: “I have a large number of Z-Wave switches and receptacles in my house from GE/Jasco. The problem with their product is that there is no easy way to use a wall switch to control the Z-Wave outlet. this product has a control wire that can be connected (to white/neutral) on a traditional toggle switch and will turn the outlet off and on. this is great when you only have two wires in your switch box.”
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