eufy Video Doorbell (Wired) S330: problems, parts and running costs

Checked: 2026-10-17

Summary

A hardwired dual-camera doorbell (2K HDR front camera plus a 1080p package camera) that runs off existing 16–24 VAC wiring with no battery and no monthly fee, storing motion events on 8 GB of built-in storage. The main trap is the transformer: eufy asks for 30 VA or more and warns that common 8 V and 16 V 10 VA units are usually too weak, causing dropouts and chime trouble. Recording and playback carry no subscription, so yearly cost is effectively 0 unless a HomeBase or cloud backup is added.

Common problems and fixes

Underpowered transformer — eufy warns that common 8 V and 16 V 10 VA transformers are usually insufficient, causing the doorbell to drop offline or the chime to misbehave; the fix is a 24 V 40 VA transformer. [1]
Bottom camera does not trigger motion — one owner reports “Motion detection does not work for the bottom camera, only the top” on the wired S330. [6]
Pairing difficulty — one owner says the manual’s pairing steps were effectively absent and pairing failed repeatedly (“Must have tried it 15 times to failure”). [5]
Overheating — a “Doorbell heating issue” thread reports the unit becoming “very hot from the back” within minutes, with a replacement showing the same behavior. [7]
Slow alerts — Consumer Reports measured about 7.5 seconds average alert response, described as slow. [2]
No HomeKit — only Amazon Alexa and Google Assistant are supported. [1][3][4]
Local-only footage risk — recordings live on the doorbell, so a stolen or damaged unit loses them unless a HomeBase keeps a copy. [1]
Events deleted only a day at a time — there is no delete-all option for the event history. [10]

Parts and consumables

24 V 40 VA transformer — the required replacement when the existing unit is too weak; not included. [1]
HomeBase (optional) — stores a second copy of footage and adds integration; not included. [1]
Doorbell chime — included in the box. [1]
Larger mounting wedge — owners asked for one; not included. [8]
Additional chime — owners asked for a second chime; not included. [9]
Optional cloud backup — available but not required for local recording and playback. [1]

Yearly running cost

Not enough data to state a typical yearly figure. Recording and playback carry no subscription, so the storage cost is effectively 0; the only likely spend is a one-off 24 V 40 VA transformer if the existing wiring is too weak, plus an optional HomeBase or cloud backup if footage must survive theft. No electricity figure was reported.

When it is a good buy

eufy sells the wired S330 direct for $179.99 (checked 2026-10-16), Consumer Reports shows the exact model from $119.99 at retailers, and Tom’s Guide listed the wired-only E8203111 at $199.99 in a July 2022 review. In eufy’s lineup it sits above the battery E340 at $149.99 and below the 3K wired S4 at $299.99. [1][2][4]