You can get email alerts on a specific wave. For this
1. Add wave-email-notifications@appspot.com to your contacts
2. Add wave-email-notifications to the wave
3. This will send an email to the other users who all are joined in that wave
Mail body below
It will have two links
- Link to the wave (Clicking on that will take you directly to the wave.
- Preferences this will take you to the email preferences, a screen like below
You can choose whether you need email on each update on the wave or not. Click update if you made any change.