In a 12 month period you should save between 35 and 55% of your water heating bill
All our systems have an electrical back-up element which would be affected by load-shedding. If it has been a good solar day it is unlikely that your element would need to switch on, however our pumped systems are installed with a 220V circulating pump and digital controller both of which require electricity to run and circulate your water.
If one has a back-up UPS this will eliminate any issues. Our thermo-siphon systems on the other hand naturally circulate hot water (natural convection) without the use of a pump and controller.
If your roof is North facing or no more than 45° off North, we recommend the flat plate collector.
If your roof is more than 45° off North, we recommend the evacuated tube collector.
If your roof is flat, we recommend the flat plate collector.
Latitude plus 10° is ideal.
However angles from 15° to 55° are acceptable but not ideal.