New Zealand Legislation: Regulations
Regulations are laws made under Acts
(1) The thermal efficiency standard for a woodburner—
(a) is the ratio of useable heat energy output to energy input (thermal efficiency); and
(b) must be not less than 65%.
(2) The thermal efficiency must be calculated in accordance with the method specified in Australian/New Zealand Standard AS/NZS 4012:1999, Domestic solid fuel burning appliances—Method for determination of power output and efficiency.