(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—
(a) 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; or
(b) for a woodburner excluded from that method, another method that is functionally equivalent.
Regulation 24(2): substituted, on 1 June 2011, by regulation 15 of the Resource Management (National Environmental Standards for Air Quality) Amendment Regulations 2011 (SR 2011/103).