Hot water calculator

Use this calculator to estimate the cost of hot water in your home. Simply enter your usage details and select the types of hot water systems you would like to compare then press “calculate”.
There are a variety of hot water systems and tariffs available. We recommend you ask your hot water supplier about the best system and tariff connection to suit your particular needs.

Hot Water System

  Existing System New System

Estimated Annual Usage

  Existing System New System
kWh/yr kWh/yr
  Existing System New System
MJ/yr MJ/yr
  Existing System New System
  Existing System New System
Tonnes CO2 Tonnes CO2
Annual running costs Annual greenhouse emissions
Existing System
$
New System
$
Existing System
Tonnes CO2
New System
Tonnes CO2

Notes: 

1) Estimated annual running costs for electricity and natural gas are calculated using energy prices indicative of competitive 2015/16 pay-on-time offers advertised by the major energy retailers for residential customers in the Ausgrid network area and the Jemena mains gas network area.

2) Greenhouse gas emissions are estimated using the National Greenhouse Factor of 0.96 kg/kWh for the electricity generated and distributed in NSW and 0.06433 kg/M for natural gas distributed to metropolitan users in NSW. These factors are published by the Department of Climate Change and Energy Efficiency in the (NGA) National Greenhouse Accounts Factors, August 2015.

3) Standard and low-flow showerhead flow rates assumed to be 13 litres per minute and 8 litres per minute respectively.