Aranet vs Airthings vs Ecosense for Continuous Radon Monitoring: When Each Model Makes Sense

Corentium Home: the simplest approved option

The original Corentium Home is still sold on Airthings Canada at $179.99, making it the least expensive C-NRPP-approved monitor from any of the three brands. It runs on batteries, has no app and no wireless connection, and shows both short- and long-term averages on its own screen. C-NRPP lists its first reading at 24 hours and its accuracy at ±10% after seven days at 200 Bq/m³.

It is deliberately limited. That is the point. For a set-and-forget basement measurement, a device that cannot drop a Bluetooth connection or need a firmware update has a certain appeal.

View Radon: the connected option

The View Radon is the Airthings model for people who want remote access. It is listed at $249.99, connects over 2.4 GHz Wi-Fi, has an ePaper screen and can run on six AA batteries for up to three years or on USB power. With Wi-Fi and USB connected, it can also act as a hub for other Airthings sensors.

One trap for Canadian owners: the default colour thresholds on the View Radon specification page turn the indicator red at 150 Bq/m³ and yellow at 100. Those are below the Canadian guideline of 200 Bq/m³. A red glow does not, on its own, mean your home exceeds the Health Canada guideline.

Corentium Home 2: newer, better connected, not yet listed

Corentium Home 2 costs $249.99 and adds Bluetooth, SmartLink pairing with an Airthings hub, and temperature and humidity sensors. Its screen cycles through 24-hour, 7-day, 30-day and long-term rolling averages and defaults to the long-term figure after five minutes. Airthings states accuracy within 10% after seven days at 200 Bq/m³, and the first value appears after 24 hours.

Two practical notes. It ships set to pCi/L, the U.S. unit, so switch it to Bq/m³ using the button inside the back cover. And it is not on the C-NRPP approved list as of this writing.

The warranty advantage

Airthings offers the longest coverage in this comparison: a free five-year warranty on its consumer monitors when you register the device within 30 days of purchase. Miss the window and you fall back to the standard warranty. Register on day one.

EcoQube and RadonEye: the approved pair

Every Ecosense home monitor uses a pulsed ion chamber that updates every 10 minutes. The two approved models differ mainly in how you reach the data.

The EcoQube, listed at $189 on Ecosense's Canadian store, is plug-in, connects over 2.4 GHz Wi-Fi, supports remote access and keeps timestamped hourly data in the app. Its on-device indicator is a colour light rather than a numeric screen.

The RadonEye RD200, listed at $215, is plug-in with an OLED numeric display and a Bluetooth app. Ecosense's own spec grid notes it does not keep timestamped data, which limits after-the-fact analysis of when a spike happened.

C-NRPP lists both at ±10% at 370 Bq/m³ after 10 hours of measurement, displaying an hourly rolling average on the device with short- and long-term averages in the app. Fast settling is the Ecosense signature. It is useful for watching cause and effect — a closed basement door, a furnace cycle — within an afternoon.

EcoQube Flex and EcoBlu: useful, but unlisted

The EcoQube Flex ($249 on the Canadian store) is the battery-powered portable in the line. It runs up to seven years offline on two AA cells, or about two years with regular Bluetooth syncing, and stores a year of data on the device. Its app lets you label results by room, which makes it the natural fit for mapping a house. It is not on the C-NRPP list.

The EcoBlu ($165) is a plug-in, no-app monitor with a large LED readout and lower stated sensitivity. It is also not on the list.

Warranty and where you buy

Ecosense's limited warranty runs 12 months, extended to two years if you register within 30 days. Its terms apply only to products bought from Ecosense or an authorized seller and exclude damage from extreme temperatures, high humidity or water exposure. Two consequences follow: buy from the brand or a listed retailer rather than a marketplace reseller, and keep the unit off a damp floor.

Bq/m³, rolling averages and why they disagree

Canadian guidance is expressed in becquerels per cubic metre (Bq/m³) — a count of radioactive decays per second in a cubic metre of air. U.S. devices and websites default to picocuries per litre (pCi/L). One pCi/L equals 37 Bq/m³, so the U.S. action level of 4 pCi/L is about 148 Bq/m³, not 200.

Every monitor here reports rolling averages: the mean of all readings over a moving window. A 24-hour average reacts quickly and swings widely. A 30-day or long-term average moves slowly and is the one that approximates your actual exposure. When a short-term figure sits above your long-term average, levels are rising; when it sits below, they are falling.

What Health Canada says about early spikes

Health Canada addresses the most common new-owner panic directly. Its Guide for radon measurements in homes notes that short-term variations above 200 Bq/m³ are possible, that the guideline applies to the average annual radon level, and that 91 days is the minimum test length for a valid estimate of that average.

In practice:

• First 24 to 72 hours: ignore the number. The device is settling, and you have no baseline.
• First few weeks: watch the pattern. Daily cycles and weather swings are normal.
• After 91 days in the heating season: read the long-term average. That is the figure to compare against 200 Bq/m³.

Placement changes all of this. A monitor beside a sump pit or a supply register will tell a different story than one on a bookshelf in the family room.

For placement rules that hold across all three brands, see where to place a radon detector in a Canadian home.

Where the line sits

A continuous monitor and a long-term test answer different questions. The monitor tells you how radon behaves in your home — when it peaks, what changes it, whether a fix is holding. A long-term test tells you what your average exposure is over a heating season, which is the number a mitigation decision rests on.

C-NRPP's guidance on its consumer monitor page bridges the two. Leave the monitor in place for at least three months, ideally in the heating season, in a room occupied at least four hours a day. If you can only run it for less than 91 days, follow up with a long-term test. And because every brand averages differently, read the manufacturer's guide to find which figure is the long-term average.

When a lab-analyzed test is the better tool

Three situations call for a C-NRPP-approved long-term test kit, or a certified measurement professional, rather than relying on a consumer monitor alone:

• You are deciding whether to mitigate. Health Canada's guide says short-term measurements are not appropriate for that decision. A 91-day alpha-track test analyzed by an approved lab gives you a documented result.
• You need a record someone else will accept. In Ontario, Tarion requires radon claims under the new-home warranty to be backed by a test spanning at least three months using a device or professional approved and certified through C-NRPP.
• You want an independent check on your monitor. Running an alpha-track detector beside your monitor for a heating season is the closest thing a homeowner has to calibration.

Take Action on Radon lists Canadian providers of approved long-term kits, which typically cost about $45 to $75 with lab analysis included. That is a small price for a defensible number.

If you are weighing a kit against a professional measurement, our comparison of DIY radon test kits versus professional testing in Canada breaks down what each costs and delivers.

The selection framework

Start with one question: how do you want to look at your radon data? Then match.

The post-mitigation case

Post-mitigation observation is the one moment where a continuous monitor earns a formal role. C-NRPP's post-mitigation steps call for a short-term test of at least 48 hours, started after the fan has run for at least 24 hours, and explicitly allow a digital radon monitor for it. Reset the device first so you are reading only post-fan data. Then plan a long-term test the following heating season, and at least every five years after that.

A monitor left running after that check is genuinely useful. A fan that fails, a sealed crack that reopens or a new exhaust appliance will show up as a step change in the trend — usually weeks before anyone would think to retest.

For the full verification sequence after a system goes in, see radon follow-up testing after mitigation.

What co-location can and cannot tell you

Plenty of owners end up with two monitors in the same basement and notice they disagree. That is expected, and it is not a ranking.

C-NRPP's published comparison of consumer monitors found that consumer units are not usually individually calibrated after purchase and typically arrive with no unit-level accuracy record. Two units of the same model can differ. Two different sensor designs — a diffusion chamber that reports daily, an ion chamber that updates every 10 minutes — will disagree most in the first days and converge, if at all, over weeks.

How to run a fair comparison at home

If you do place two monitors together, give the comparison a fair chance:

• Same spot, same height. Side by side on the same shelf, at least 50 cm off the floor, away from vents and exterior walls.
• Same start time. Reset or start both together and note the date.
• Same window. Compare the same averaging period on each device — 7-day to 7-day, 30-day to 30-day — not one device's hourly figure against the other's long-term average.
• Log the conditions. Note furnace use, open windows, power outages and any time a unit was moved or lost its connection.
• Judge over weeks, not hours. Agreement after a month means more than disagreement after a day.

Even then, agreement between two monitors in one basement shows only that they agree in that basement. It does not tell you which is right. An approved long-term test running alongside them is the referee.