Oil column heaters

Oil column heaters, or simply oil heater, are a common form of domestic heating.   They operate by heating up a reservoir of oil which then circulates around the fins of the heater.  They are 100% efficient.

They can be purchased for as little as NZ$39 (2019 prices).  Some are of poor quality with the castors or castor holding bracket failing within a short period.

A mineral oil with various additives is used to transfer the heat from the element to the radiating fins.

Further information