Wardy

I doubt that is the case otherwise there would be a lot of threads discussing this and a lot of people would be experiencing issues.

The statement lacks a lot. Solar installations produce electricity at the voltage and frequency that household appliances use. 
https://www.dailymaverick.co.za/article/2022-10-09-check-your-geyser-it-might-save-you-electricity-and-money/

Exactly,
Not to mention that inverter voltage regulation is sometimes dramatically more stable than council power.
COJ voltage my side fluctuates all the way from 190V post-loadshedding (low enough to shorten the lifespan of some devices such as fridges) to 222V; whereas output from the inverter is a rock-solid 230V.
Similarly of all the devices that could get damaged, regular electric geysers aren't likely candidates due to their fundamental simplicity (a basic thermostat, a tank to hold water, and a heating element - basically just a large resistor.). There're no super-sensitive electronics there...

My rant for the day.
One has to wonder when the Solar Inverter Industry in general will reach the level of maturity of Motherboard manufacturers where any user can download the latest version of the BIOS from the website and where the BIOS release notes are made clear too.
This industry is still in it's infancy and one gets the impression that the users are expected to beg for it.
What we are experiencing is the same as in the PC industry about 25 years ago. Not acceptable. 
When there is a firmware update, release it on the website with clear instructions how to install it and the release notes. Simple. Keeping it a secret and maybe sending it to someone after that person begs for it is ransom, not customer care.

Thanks. Leshen has been very prompt with helping me. Now it is up to me to make up my mind.