Smoke, gas or CO sensor: which one do you need
A smoke or gas sensor is not the same as a CO sensor. Smoke warns about fire, gas about a combustible gas leak, and CO about carbon monoxide which you can neither see nor smell.
Quick answer
If you want a fast decision, start with the scenario: what should happen when you leave, return, get up at night, detect water or want to lower the heating. Devices are chosen only after the scenario is clear.
What matters when choosing
A smoke sensor belongs in hallways, near bedrooms and on each floor. A gas sensor goes near a gas cooker or boiler, a CO sensor near a fireplace, stove, garage or boiler room. Placement depends on manufacturer instructions.
A good smart home does not add work. It runs quietly in the background, does not send unnecessary notifications and does not require every family member to understand five apps. Fewer reliable scenarios are better than many random devices.
Local example and price
In a house near Kranj with a fireplace you would have a smoke sensor in the hallway, a CO sensor near the sleeping area and a gas sensor in the boiler room if gas equipment is present. On alarm, a light can turn on and a notification is sent.
In Ljubljana a common starting point is an apartment without drilling, in Maribor it is houses with heating and a yard, and in Koper apartments, humidity and temporary access for guests.
Indicative pricing: a basic kit of sensors and smart plugs starts at 150-400 EUR, a usable starter package with controller, sensors and a few scenarios is often 490-990 EUR, and a larger smart home with heating, lock, cameras and multiple zones is 2,000-5,000 EUR or more.
Prices are indicative and meant to speed up the decision before the site visit. For legal, subsidy or technical conditions, always check the current state before execution. In any offer it is useful to separate equipment, installation, app setup, additional licenses or subscriptions and future expansion. That way the client compares the whole result, not just the cheapest device.
When you compare two offers, compare the same line items: brand and equipment class, warranty, labour, materials, configuration, testing, post-installation support and future expansion. The cheapest offer is not necessarily bad, but it must be clear what is included and what will be charged extra.
Choice table and on-site visit
| Sensor | Detects | Where |
|---|---|---|
| Smoke | Fire | Hallway, floors |
| Gas | Gas leak | Kitchen, boiler |
| CO | Carbon monoxide | Fireplace, boiler room |
| Water | Leak | Kitchen, bathroom |
- what should happen automatically
- which devices must work even without internet
- who will have access to the app
- whether Wi-Fi is stable in all rooms
- whether the system can be expanded without replacing all equipment
A site visit shows where the signal is weak, where there is no power, which devices need to work locally and who will use the system. This avoids a solution that is technically interesting but tiring in practice.
Related solutions and sources
For smart home packages see /packages, for connection with video surveillance /cameras, and for energy scenarios /solar. Related topic: Smart home scenarios: 10 practical examples.
Frequently asked questions
How much does a smoke or gas sensor cost?
Basic systems can be a few hundred euros, a larger smart home several thousand. Price depends on the scenarios.
Does it work without internet?
Critical local scenarios should work without internet; remote notifications usually need internet.
Can I start with a small package?
Yes. It is best to start with security, lighting or heating and expand later.
What is the most common mistake?
Buying devices without verified compatibility and without a clear scenario.
When is a site visit needed?
When you want to connect multiple systems: heating, cameras, lock, sensors or solar.
Free on-site visit
For a smart home without unnecessary devices, book a free site visit: /contact.html.