Cheapest way to add timers to geysers

[TheTerribleTriplet]

He made a good point on that too:

@Village_Idiot

/tldr: the water cylinder is probably less important than the pipes. Likely more useful steps: heat the water in whatever source cylinder once a day to above 50-60°C, if particularly cautious do this heating closer to the time that the water will be used, allow the water to run for a minute or two before use and if extra, extra cautious don’t take a 30 minute shower and if extra, extra, extra cautious turn of the shower tap in between lathering etc. I am not paying anyone’s medical/funeral bills.

…

With regard to the second highlighted conclusion, these folks even found some Legionella in low flow shower heads. I will wager that throughout South Africa, during summer, most water pipes in the roof space of houses will likely provide a better environment for Legionella to thrive than the geyser (which through periodic very high temperatures will have a partial sterilization effect).