Home > Uncategorized > Airthings Wave Plus vs RadonEye RD200

Airthings Wave Plus vs RadonEye RD200

November 16, 2020 Leave a comment Go to comments

We have a couple of Airthings Wave Plus devices to keep track home air quality metrics like CO2, TVOC (Total Volatile Organic Compounds), and radon levels. While the non-radon readings like CO2 and temperature have been accurate and responsive, over time it was noticed that the radon readings did follow environmental changes like open windows and air cycles as quickly, or at all. Instead the radon readings seemed to raise and drop at their own pace. I chalked it up to stronger outdoor effects like rain but given I was starting to try to track down potential radon sources (like the effects of our open basement floor shower drain) I was interested in both accurate and responsive readings to help validate any fixes.

The initial sensor location is a daylight basement office (11’x13′) with a single small 1’x4′ window with a 1’x2′ opening. There’s a small strong 9″ fan (Honeywell HT-800) inside the window bay that pulls in enough fresh air to easily turn over the room’s air several times over the the course of the day. The entire basement floor is a daylight basement on a steep hill where the backside of the house is fully below ground and the front side of the house is fully above ground. We live in a Zone3 radon region (where average indoor levels are <=2 pCi/L) but more locally the risk is moderate. Both of the sensors are on a small shelf near each other about 4′ from the floor and 1′ away from the wall.

Enter a RadonEye RD200 purchased to compare against the Wave Plus. It touts itself as being “>10x more sensitive and accurate than other home radon detectors“. The RadonEye takes readings every 10 minutes though the data export from their app only yields data in 1-hour increments with each data point being a 60 minute moving average. Neither the Wave Plus or the RadonEye are certified, but the RadonEye Pro is “AARST-NRPP and NRSB” certified and both the Pro and non-pro version tout very similar features, including the sampling rate and touted accuracy, so there’s a non-trivial chance that the non-pro version is as good as the Pro version just without the certification backing it up.

With only a couple of day’s worth of results to compare against the Wave Plus so far the RD200 seems to be much more responsive and seems to track well against changes in the environment. For the last 48 hours here is an Excel rendering of the data exported from RadonEye’s app and the same timeframe via Airthing’s https://dashboard.airthings.com:

Summary table for that same 48 hour period:

Low pCi/LHigh pCi/LAverage pCi/L
Airthings Wave Plus0.32.21.1
RadonEye RD20000.171.450.7

So far the numbers are in roughly the same ballpark but the Airthings reads about 41-55% higher at any given time and seems to be moving with a 12-hour moving average or… something. For instance at 5pm today 11/16 the RadonEye noted levels of 0.17pCi/L, after a full work-day’s worth of a fan pulling in fresh air. However Airthings recorded it at the highest level for the 48hour period or 2.2pCi/L.

To be updated after a full week’s worth of data…

Categories: Uncategorized

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