ETwater HermitCrab Pro – Convert Existing Conventional Controller to Smart Irrigation



Eliminating water waste

  • Converts your existing conventional irrigation sprinkler controller into an internet connected, smart irrigation capable one.
  • Powered by the ETwater cloud-based system that automatically adjusts landscape watering schedules by zone/station according to weather forecast, plant types, soil, micro-climate, and other environmental data.
  • In 10 minutes or less, this simple box converts most brands of conventional controllers. It’s the fastest path to an ETwater upgrade for your existing Rain Bird®, Rain Master®, Weathermatic®, Irritrol®, Superior, Toro® and Hunter® controllers.


Includes 1 Year Subscription to ETwater.

Made In USA 🇺🇸

MPN: 559122 SKU: 559122 Category:

Product Description


Eliminating water waste

ETwater pioneer of smart irrigation           

The sole retrofit controller on the market that can instantly convert an existing controller to smart irrigation by plugging into the remote control port. Price includes first year of ETwater service subscription, with daily 4G LTE cellular communication to the ETwater servers for downloading new schedules to a HermitCrab® Pro retrofit controller.


  • Great value: make your conventional controller “smart” for much less than the cost of a new smart controller.
  • With 20–50% water savings possible, payback can be just a few months.


  • “Plug and Play” installation in under 10 minutes.
  • Compatible with most major controller brands.


  • Remote monitoring + management via the web.
  • Single-platform simplicity allows management of multiple controllers of various brands at multiple sites—all with the ETwater web-based system.
  • Includes the most popular labor-saving features of ETwater online dashboard including water budgeting and rainfall forecast.
  • Flow Monitoring capability, with full reporting on learned flow rates per controller and per station.

Electrical Specification

  • EPA Watersense Certified • Dimensions 7.9” L x 3.9” W x 2” D
  • Weight 2 lbs
  • Input voltage 24 VAC provided by host controller
  • 3/4” Conduit Hole in center of controller bottom
  • Flow sensor sold separately


The ETwater HermitCrab Pro is compatible with most models of the following brands. Host controller must have a remote control port.

  • Hunter®
  • Rain Master®
  • Irritrol®
  • Superior™/Sterling
  • Rain Bird®
  • Weathermatic®
  • Toro®

ETwater HermitCrab Pro from Husqvarna Group

Additional Information

Include Flow Adapter?

Yes, No

Existing Controller Model

Hunter, Irritrol or Toro (RJ 11 connector), Irritrol or Superior (6 pin remote connector), Weathermatic (RJ11 connector), Rain Bird (5 pin remote connector), Rain Bird host controller (6 pin remote connector), Rain Master (9 pin D type male remote connector)


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  • No merchandise may be returned without prior authorization and issuance of a return authorization number from IDC.
  • Credit will be based on invoice price.
  • A restocking fee of 20% (twenty percent) will be assessed on all returned goods unless a return occurred due to IDC’s error. Returned goods shall be shipped prepaid by Buyer and received in resalable, new condition before credit will be issued.
  • All returns are subject to inspection by IDC. Buyer will be billed for any freight charges incurred by IDC unless pre-approved by IDC and/or returned due to an IDC error.
  • No returns are accepted after 60 days.