eufy Doorbell Transformer and Chime in UK Homes

• Battery doorbells that can be wired (the E340, the S330 dual-camera and the older 2K Battery): 8–24 V at 10 VA or more (more than 10 VA, says the E340's UK page), which charges the battery; the E340 keeps its pack fitted
• Video Doorbell C31: battery or bell wiring, but 24/7 recording and 5-second pre-roll need a 16–24 V, 30 VA transformer
• S4 Wired Video Doorbell: no battery mode, and 16–24 VAC at 10 VA or above, a figure eufy gives on its Irish store but not its UK page
• Earlier wired doorbells (2K, 2K Pro, 1080p and Dual 2K Wired): 16–24 VAC at 30 VA or above

• On the DIN rail in the consumer unit, sitting among the breakers like one more module
• Hidden in the chime itself, on chimes fed straight from the mains, so the pro isolates that supply before opening the cover
• A separate unit elsewhere, such as under the stairs or by the meter
• Missing altogether, where the old bell was a battery or wireless kit

• Rings it: the E340, whose UK page lists an existing chime as compatible, and the older 2K Battery, with the chime type set in the eufy app
• Mechanical only: the S330 battery doorbell, marked 'not digital' in eufy's comparison table
• Until you want 24/7: the C31 rings an existing chime, but eufy says it will need to be bypassed for continuous recording
• Never: the battery-only C30, which eufy says is not compatible with an existing chime, and eufy's older wired doorbells, which eufy says do not work with the original chime

• Chime 2 (the 'Simple Chime' on eufy's UK store): 2.4 or 5 GHz Wi-Fi, 10 tones and up to 80 dB. eufy lists it as fully compatible with the S4, S330, E340, C30 and C31, not with the older wired doorbells, and it does not ring for motion
• MiniBase Chime: a 2.4 GHz plug-in chime eufy lists for the E340, C31 and C30
• For those three, a HomeBase S280 or S380, an Alexa speaker or a Google one can ring too
• The older wired doorbells (T8200 to T8203): the plug-in indoor chime eufy put in their box, since eufy lists Chime 2 as incompatible with them and the MiniBase Chime as not for older doorbells

• Leave a battery doorbell on its battery: the E340, C31 and S330 need no wiring at all
• For a wired doorbell that will not power on, check for 16–24 VAC at 30 VA, then bypass the chime with the jumper, as eufy's troubleshooting steps suggest
• Swap the transformer like-for-like on the same supply: it counts as a replacement, which Part P does not make notifiable
• Feed a new transformer from a fused spur on a circuit you already have: adding to an existing circuit away from a bath or shower is not notifiable either
• A transformer on its own new consumer-unit way is treated by JACK as a new circuit, so it goes to a registered electrician and JACK does not book it

• The transformer label, sharp enough to read the volts and the VA figure
• The chime, with any make or model label readable
• A wide shot of the door and frame from outside, since a eufy doorbell goes at about 1.2 m and may need its 15° wedge
• The eufy model and its T-number, such as T8214 for the E340

A vetted pro prices your job from the eufy model, photos of where each device goes and what power is there now, and the JACK app shows you that fixed price before you book.

The power and the walls move the price more than the device does. A battery doorbell on a brick reveal, or a SoloCam on a fence post, is a smaller job. An S4 Wired doorbell on a new transformer, a HomeBase moved to the middle of the house with a hard drive fitted, a Floodlight Camera E340 in place of an outside light, or four PoE cameras cabled through solid brick and a loft all take longer, and the price reflects that.

The eufy kit is yours to buy, since JACK sells no devices. A stronger transformer, a Chime 2, a wedge, a floodlight's weatherproof box or extra Cat cable is agreed with you and added at cost before you book, and several devices go on one booking for one price. Where parking has to be paid for, that is added at cost and agreed before you book too.

Prefer to pay for time? As a guide, smart home work is typically £45–£95 per hour, and electrical work such as a floodlight camera £55–£110 per hour. For a multi-camera system or a PoE NVR, a full-day booking is a flat £350–£400 for up to 8 hours on site.