Aico Ei146e mains-powered smoke alarm (white) with 9V battery backup

What it is and the job it does

The Aico Ei146e is a mains-powered smoke alarm (white) designed for homes where you want reliable coverage without relying entirely on batteries. On paper, it’s the sort of smoke alarm that fits well when you’re replacing older units or upgrading a system room-by-room, because it runs from 230V mains and includes a 9V alkaline battery backup (the battery is included).

The practical idea is simple: the alarm is meant to trigger when smoke is detected, and the battery backup helps keep it working even if mains power drops. It also includes a built-in test and hush button, so you can check it and silence unwanted alarms when appropriate.

Key features that matter day to day

This model is built around a couple of usability points that people tend to care about once it’s installed.

One is the loud sound. It’s rated at 85dB(A) at 3m, which is the kind of volume you want if you’re trying to hear an alert from another room.

Another is the included Easi-fit base. That’s relevant because it’s intended to make alarm head replacement straightforward. If you ever replace the sensor head later, you’re not starting from scratch.

It also has an interconnect option with other Aico 230V smoke alarms. In a multi-room setup, that can be helpful because it supports the idea of alerts being heard across the home rather than only where the first alarm triggers.

And yes, there’s a test/hush button built in—useful for routine checks and for settling down brief nuisance alerts (for example, after cooking) where it’s safe and appropriate to hush.

Where it shines in a typical UK home

It makes sense if you’re looking for a mains-powered smoke alarm with a sensible backup approach, plus controls you’ll actually use.

A simple example: imagine the kitchen gets smoky while you’re cooking. You hush it using the built-in hush button, ventilate the room, and you’re back to normal without having to remove the alarm. Later, you run the built-in test to confirm it’s still doing its job.

It’s also a good fit if you’re planning interconnection across rooms using compatible Aico 230V smoke alarms—handy for a hallway landing or bedrooms where sound needs to carry.

What to watch before you buy

This is where you’ll want to read the fine print.

First, it’s not compatible if a control switch is included in the circuit. If your wiring setup includes a switch that can cut power to the alarm line, you may run into issues—so it’s worth checking before you commit.

Second, while the description makes clear it can interconnect with Aico 230V smoke alarms, it doesn’t say it will interconnect with other brands or non-230V units. If your goal is whole-home compatibility beyond Aico 230V, you may need to rethink the approach.

Finally, a “mains powered with 9V battery backup” style alarm is great for many homes, but it’s not the best choice if you only want a fully battery-operated unit (for example, in places where mains wiring isn’t feasible).

Key takeaways for installation and replacement

Because the Easi-fit base is included, you’re not forced to hunt for extra mounting parts just to get it working. And because the base is designed for simple alarm head replacement, it can reduce hassle if you’re maintaining a system over time.

Still, if you’re unsure about your wiring situation—especially around whether a control switch is present—consider that a potential deal-breaker for compatibility. It’s also a type of product where installation decisions can matter: interconnection relies on selecting compatible units.

Is it worth it?

Buy the Aico Ei146e if you want a 230V mains-powered smoke alarm with a 9V alkaline battery backup (included), a loud 85dB(A) alarm sound, and practical test/hush controls. It also makes sense if you’re building or expanding an interconnected setup with compatible Aico 230V smoke alarms, and you value the included Easi-fit base for easier head replacement later.

Skip it if you suspect your alarm circuit includes a control switch—this model isn’t compatible in that scenario. You may also want to look elsewhere if you need full interconnect compatibility beyond Aico 230V smoke alarms, or if you’re specifically after a battery-only solution.

In short: it’s a straightforward mains-based smoke alarm with sensible everyday controls, and it’s best when your home wiring and other compatible alarms line up with its intended approach.

Quick questions (FAQ)

Will it work during a mains outage?

It’s mains-powered but includes a 9V alkaline battery backup (included), which is there to help maintain operation if mains power is lost.

Can I interconnect it with other alarms?

The description says it’s interconnectable with all Aico 230V smoke alarms, but it doesn’t claim compatibility beyond that group.

Is the battery included?

Yes, the 9V alkaline battery backup is included.

Is it compatible with a switched circuit?

No. It’s not compatible if a control switch is included in the circuit.

What do the test and hush controls do?

It includes a built-in test and hush button, intended to let you test the alarm and silence it when needed.