Insulate the geyser
A geyser ‘blanket’ maximises heat retention. Check heat loss first using a basic ‘hand test’. If the geyser is warm then it’s losing heat and needs better insulation. Particularly necessary for older geysers. Appoint a good installer or do a thorough job yourself, and check the insulation is still in place after a few days/ weeks because installation isn’t always straightforward and can come undone. Also insulate the water pipes leading from the geyser for the first 3 metres.