And as you also mentioned, your existing 2810 parts could be used as spares (except the thermo/hygro sensor) for you new 2812. Extra display, rain, and wind sensors.
Looks like that isn't the case. Here are some notes from their current HeavyWeather software for the 2812:
- This version of the Heavy Weather Software only works with the WS-2812 model weather centers.
- The 2812 display and sensor firmware were revised to calculate rain totals a bit
differently. Therefore, the software was adjusted to use these changes in the report on
the Data tab.
Maybe the anemometer is the same, but I would guess everything else is different.