What Smartscan Hydra sprayheads are compatible with wireless alarms? Technical Support June 17, 2020 09:24 Updated Any heads from serial number SH11000867 are compatible. Related articles What is the specification of the wireless Hydra alarm? How does the water usage compare to ceiling mounted sprinkler systems? How is the commissioning using a wireless alarm different from using a detector on Hydra? How do establish fitness of materials in the approved document published to support regulation 7? When does water start flowing from a traditional domestic sprinkler? Comments 0 comments Please sign in to leave a comment.