What's the standard for specifying power and voltage characteristics of domestic appliances?
What's the standard for specifying power and voltage characteristics of domestic appliances?


RMS is used to make calculations easier for consumers.

Some UPS devices express power as VA, but most consumer appliances used in homes specify Watts.


  the voltage specified is peak voltage


RMS, not peak.

I haven't been there and measured it but I am sure the mains voltage in India is near 230V RMS (I would guess it is nominally 240 V RMS but I expect in some locations the electric power companies fail to keep voltage levels up because demand exceeds what their plant can supply)


  the heater requires a 15 A socket to work efficiently


No, it requires a 15A socket to work safely. This isn't about efficiency.

A 2000 W appliance is likely to present a too-low resistance to a 5A outlet and will likely cause the wiring inside the walls to overheat and may set fire to your home. The sockets themselves may also overheat and be damaged, possibly presenting electrocution hazards.

If Indian homes are wired to the equivalent of BS546, you only have a choice of 5A or 15A outlets, you should choose a 15A outlet for a 2000W appliance.