HotBot is compatible with all electric geysers and solar geysers where the tank is on the roof (thermosyphon systems). It is not intended for gas, pumped solar thermal (where the tank is typically inside), low-pressure / push-through (typically seen in RDP houses), or heat pump geysers.
The geyser must be accessible to a technician for installation. In order for leak detection and the optional shut-off valve to work, you must have a drip tray and your geyser must be installed inside.