Fan forced gas geysers. Fan needs to be powered.I'm not following why the need for it to work with the inverter though? Gas geysers I've seen have a ignition battery and the gas, no electrical connections?
Dewhot 20L Gas Geyser Fan Forced | Room Sealed
The Cutting Edge 20L Gas Geyser Fan Forced is one of the Safest and Most Efficient Gas Water Heaters on the Market. Versatile and Compact.