Green CATCH uses excess solar power to heat your hot water.  It uses your existing solar installation and saves you hundreds of dollars every year!

Trying to energy efficient with water heating is like walking along a tight rope; too far one way and the efficiency is at the expense of consistent supply of hot water. Too far on the delivery side and the efficiency level drops off.

This balancing act is easily done with Green CATCH as it is getting a complete picture of power movements in the home all day, plus a weather forecast each evening to help make a decision about what to do with the off-peak or night time tariff each night.

But what happens if you don’t have the internet?

Green CATCH is designed to be adjusted through the seasons, so 2-3 times a year.
In winter time you may decide to start the heating process with 2 hours of off-peak, and the rest done by your solar panels. In summer this may be adjusted to zero as there is enough surplus solar in the long days to heat your water to thermostat cut-off.

What if there is a string of bad weather?

That’s where Green CATCH comes in!
Green CATCH uses instructions from the user adjustable buttons to help make that balancing act as effective as possible.
This is the User Adjustable Green CATCH determines how much off-peak or night time tariff to use to start the heating process. This way there is a controlled amount of heating each night to ensure you have enough hot water the next day. The rest can be done by your surplus solar each day.

The number one priority for CATCH is to make sure you don’t run out of hot water. CATCH has a built in algorithm that knows how best to use your free solar energy and your off peak  electricity to make sure you always have a tank full of hot water.

What if I forget to adjust the system?

Green CATCH is smart enough to account for this. Already we have discussed how Green CATCH will override the timer if there is a string of bad weather. Green CATCH will also work towards being more energy efficient, and this is how it’s done…
The winter time setting has the off-peak timer set at three hours, but the owner has forgotten to adjust this setting for the longer days in Spring and Summer. What will start to happen is the three hours of off-peak will kick in, the sun will come up early and the heating process (thermostat cut-off) could be completed by 9AM!
Now CATCH has gone too far to the delivery of hot water side of the tight rope. We need improved efficiency by using more of the surplus solar.
What Green CATCH will do is reduce the time set on the dial by 12.5% each day that the thermostat cut-off is reached before midday. This means that an extra 12.5% of energy has to come from the solar panels, which means it is saving you money!
Once the cut-off at midday is achieved then the adjustment will stop.
If cut-off is missed for one day, because of bad weather, then the process starts again.
Green CATCH is always walking the tight rope of hot water efficiency every day to keep your water hot but using as much of your solar to do the job as possible.

Who needs a Green CATCH?

Green CATCH is best suited to these situations;

  • Those who don’t have the internet
  • Those who are in locations where the hot water circuit is not accessible from the main meter box (your electrician will know what this means).
  • Those with small solar arrays (just from a cost point of view. Green CATCH will work very well on small solar arrays).
  • Those who don’t use a lot of hot water.


CATCH is an Australian designed, engineered and manufactured product for Australian Conditions.