Powerline is the most variable product in home networking. In the right house it is close to magic; in the wrong one it barely works, and the house decides.
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Powerline sends network data through your house's electrical wiring, so it goes wherever the wiring goes and walls are irrelevant. That is the appeal, and it is real. The catch is that your wiring was installed to carry electricity, not data, and how well it carries data is a property of your specific house that nobody can tell you in advance.
How it works, briefly
One adapter plugs into a socket near your router and connects to it by Ethernet. A second plugs in near the device you want to connect. The pair modulate a high-frequency signal onto the mains wiring between them, and to everything on your network they simply look like a long Ethernet cable.
Because the mesh system or access point on either end cannot tell the difference, powerline works as a backhaul for anything — including a mesh node.
What decides whether it works well
Factor
Effect
Whether both sockets are on the same circuit breaker phase
The single biggest factor. Cross-phase runs can lose most of their throughput, or fail to connect at all
Age and condition of the wiring
Old, long or poorly terminated runs attenuate the signal badly
Distance along the wiring, not through the air
Two adjacent rooms can be a long way apart electrically if the circuit loops via the panel
Surge protectors and filtered extension leads
They filter out exactly the frequencies powerline uses. Never plug an adapter into one
Noisy appliances on the same circuit
Motors, chargers, dimmer switches and LED drivers all inject noise
The rated speed on the box
A laboratory figure. Expect a fraction of it, and be pleased when you get more
The variables, in order of how much they matter. None of them is on the box.
Scroll the table sideways to see every column.
Try this first
Plug adapters straight into the wall, never into a surge protector or power strip
A surge protector filters the high-frequency signal powerline depends on. This single mistake accounts for a large share of "powerline does not work in my house", and it is why the passthrough socket on better adapters matters — it gives you back the outlet you just used, without putting a filter in the path.
How to test it cheaply
Buy the cheaper kit first, from somewhere with a returns policy. An AV1000 kit delivers roughly 80% of an AV2000 kit's performance for about 60% of the price, and if powerline fails in your house it fails for both.
Plug both adapters into wall sockets, not extension leads.
Run a speed test through it. Compare against a direct Ethernet connection at the router. Anything above about 100 Mbps is a usable result; above 200 Mbps is a good one.
If it is poor, try different sockets. Moving one adapter to a socket on a different circuit can change the result dramatically, in both directions.
If it is still poor, try G.hn instead of HomePlug. Different modulation, and materially better on old wiring and across phases. Note that G.hn and HomePlug adapters cannot talk to each other, so you commit to one standard.
If nothing works, return it and use coax.MoCA is shielded, predictable, and does not care about any of the above.
Powerline versus the alternatives
Against a wireless extender: powerline wins whenever a dense wall is in the way, and loses when your wiring is bad. Against MoCA: MoCA wins on almost every measure, and only loses when you have no coax. Against Ethernet: Ethernet wins always, and only loses on whether you can install it.
We do not run a lab. Specifications are the manufacturers'; performance context comes from the independent outlets named in Sources. The scores are our weighting of those inputs against the specific job on this page, and the rubric is shown on every pick. What we do and do not assert.
Quick picks
Ranked by our published scoring rubric (real throughput, tolerance of bad wiring, ports, value). Tap any row to jump to the full write-up, or go straight to the retailer from the right-hand column. How we score.
#
Product
Best for
Score
Price
1
Illustrative
TP-Link TL-PA7017P KITAbout 80% of the AV2000 kit's performance for roughly 60% of the price — the sensible first gamble on your own wiring.
Scroll the table sideways on a narrow screen. Scores are our editorial assessment from published specifications and independent testing by named outlets — not our own lab results. What we do and do not test.
The picks in full
Illustrative
#1 · The right kit to test with first
TP-Link TL-PA7017P KIT
TP-Link · Budget tier
Roughly 80% of the AV2000 kit's performance for about 60% of the price — the right first try, because powerline is always a gamble on your wiring.
Key specifications
Rating
AV1000
Relative performance
About 80% of the AV2000 kit
Plug
Passthrough AC socket
Score 7.9/10
Real throughput7.5
Tolerance of bad wiring7.0
Ports6.0
Value10.0
What it gets right
+Cheap enough to test whether powerline works in your house at all
+Still comfortably enough for streaming and video calls when the wiring cooperates
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Common questions
Do powerline adapters actually work?+−
In many houses, very well; in some, badly. The dominant factor is whether both sockets are on the same circuit breaker phase, followed by the age and length of the wiring between them. Because it is house-specific, buy the cheaper kit first from somewhere with a returns policy.
Why is my powerline adapter so slow?+−
Most commonly because it is plugged into a surge protector or filtered power strip, which filters out the frequencies powerline uses. After that: the two adapters being on different circuit phases, old wiring, a long electrical path, or a noisy appliance on the same circuit.
Is G.hn better than HomePlug powerline?+−
On older wiring and across different electrical phases, yes — G.hn handles both noticeably better. HomePlug AV2 is more widely supported and has more models to choose from. The two standards cannot interoperate, so you pick one.
Can I use powerline for mesh backhaul?+−
Yes. Powerline presents as Ethernet, so a mesh node cannot tell the difference and will use it as a wired uplink. It is a genuinely good use for powerline, because it removes the mesh throughput penalty at the far node.
Illustrative
