A flexible way to control your external heating source

• Perfect for selecting, using and synchronizing alternative heat sources
• 4 single switches and one CO connector for your accessories
• Energy saving
• The choice between 4 modes of operation:

- Internal: electrical heater only
- External: secondary heat source only
- Both: electrical heater & secondary heat source
- Smart: secondary heat source & electrical heater if needed (1°C below set point)

• Water must be heated by the external source after the spa pack

Compatible with the following Y series control systems:
in.ye-5 0610-221045-338 with software 338 revision 6 and later
in.yt-7 0611-221027-349 with software 349 revision 3 and later