13/03/24 Please note this page is in the process of being updated and will be finalised shortly.
Introduction
With the implementation of the NCC 2022 across most parts of Australia (see ABCB link), the NatHERS Scheme has introduced the modelling of Appliances (Whole of Home or WoH) for residential homes for energy-efficiency compliance.
This brings into the NatHERS process the assessment of the efficiency of a range of fixed appliances in a home, and requires a minimum level of performance to be achieved alongside the NatHERS Star-Rating in the form of a Whole of Home Rating to achieve NCC compliance.
In this guide the terms 'Appliances', Whole of Home and WoH are used interchangeable to represent this aspect of modelling.
NatHERS WoH in the NCC
NatHERS WoH Methodology
The basis of a NatHERS Whole of Home assessment is to specify the various required appliances in the project and achieve or exceed the required minimum WoH Rating to achieve compliance.
The framework has a comprehensive calculation methodology for these appliances for Australia homes based on substantial research and interrelation with other Australian energy-efficiency programs such as the GEMS (Greenhouse and Energy Minimum Standards) Star-Rating standards.
The calculations involved in NatHERS WoH use a similar
NatHERS WoH Appliance categories
NatHERS WoH focuses primarily on the major fixed appliances that are expected to be installed for a new dwelling. These categories include:
Category | Regulated or non-regulated | Further info |
Heating and Cooling (HVAC) | Regulated | https://support.hero-software.com.au/hc/en-us/articles/29265576051481-Heating-and-Cooling-Appliances-HVAC |
Hot Water (HWS) | Regulated | https://support.hero-software.com.au/hc/en-us/articles/29265583857945-Hot-Water-systems-HWS |
Cooking | Non-regulated | https://support.hero-software.com.au/hc/en-us/articles/29265586491289-Cooking |
Lighting | Regulated | https://support.hero-software.com.au/hc/en-us/articles/29615995877529-Lighting |
Pool and spa pumps | Regulated | https://support.hero-software.com.au/hc/en-us/articles/29265641633433-Pools-and-Spas |
Solar photovoltaic (PV) & Batteries | Regulated | https://support.hero-software.com.au/hc/en-us/articles/29265651946521-Solar-Photovoltaic-and-Batteries |
Plug-loads | Non-regulated | https://support.hero-software.com.au/hc/en-us/articles/29265644079897-Plug-Loads |
Regulated vs Non-Regulated Loads
The introduction of appliance energy-efficiency requirements in the NCC only assesses the performance of some categories of fixed appliances expected in a house, these are called Regulated Loads and effect the WoH Rating.
Some categories of appliances are modelled and calculated within the tool, but are Non-Regulated Loads, in that they are modelled but do not effect the final WoH Rating. These Non-Regulated Loads have been included to ensure that a more accurate and representative overall energy demand for the dwelling, including it's overall energy usage, running-cost and emissions, as well as to allow more accurate sizing of solar PV and battery sizing.
WoH Calculations & Results
As detailed further in the Appliance Results section
WoH Rating
WoH Compliance requirements
WoH Documentation requirements
WoH Certification
The introduction of WoH means that NatHERS Certificates have been updated for NCC 2022.
Training Requirements
Accredited NatHERS assessors must take further training in NatHERS WoH to be able to assess Whole of Home compliance. A free training program has been delivered for the NatHERS administrators
Supporting Resources
The below resources may be useful when assessing a Whole of Home project.
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