Dual Gas and Electric Geyser: Is a Hybrid Worth It?

Dual gas and electric geysers: is a hybrid worth it?

A dual (hybrid) geyser has a gas burner and an electric element in the same tank. When gas is cut you can heat with electricity instead. It is a good fit for homes with long daily gas outages; for homes where gas returns within hours, keeping the existing geyser and adding auto ignition is usually the cheaper route.

How a dual geyser works

The tank has the usual gas burner, pilot and thermostat at the bottom, plus an electric element with its own thermostat. You can run either or both. The gas side still has a standing pilot in most models, so it still goes out during load shedding.

Advantages

Hot water even during long gas cuts, as long as there is electricity.
Useful backup during gas pressure drops on winter mornings.
One tank instead of two separate geysers.

Drawbacks

You pay for a whole new geyser and installation.
Electric heating costs more to run than gas.
Needs a proper electrical circuit as well as gas.
The gas side still goes out with the gas unless relit, by hand or automatically.

Hybrid or auto ignition?

Ask how long your gas is off on a typical winter day. If it returns within a few hours, a well-insulated tank keeps water warm and auto ignition restarts heating as soon as gas is back. If gas is off for most of the day, a dual geyser gives you a second heat source. Some owners combine both: auto ignition on the gas side, element for long outages.

Frequently asked questions

Does a dual geyser relight its gas pilot automatically?

Most do not; the gas side usually has a standard pilot. Check the model, or add an auto ignition kit if its gas side uses a conventional unitrol-type thermostat.

Can I use gas and electricity together?

Many dual geysers allow it for faster heating, but it uses both energies at once.