What is Instant vs storage?
Instant heats water as it flows; storage heats a tankful and keeps it warm.
Short answer
Instant geysers cannot fill a bucket at usable temperature in cold winters.
Instant vs storage when buying a water heater (geyser)
Instant heats water as it flows; storage heats a tankful and keeps it warm.
Why it matters: Instant suits kitchen sinks and quick handwash; bucket or shower baths need storage.
Look for: Instant geysers cannot fill a bucket at usable temperature in cold winters.
Full Water Heater (Geyser) buying guide