Heat pump vs gas hot water (AU): rebate stack, net outlay and payback verdict by postcode.
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Use when someone asks whether a heat pump hot water system is worth it in Australia, which rebates they can stack, how much a heat pump costs after rebates, or how long it takes to pay off — including "can I combine the STC rebate with Victorian Energy Upgrades or Solar Victoria", "do I qualify", and "is a heat pump cheaper to run than gas". Given a postcode, the current hot water system and a few household facts, returns the rebates actually stackable at that postcode (with each scheme's eligibility gates and source), the net-of-rebate outlay, the payback period, and which term — rebates, the avoidable gas supply charge, the energy saving, or a replacement you were buying anyway — is really carrying the decision. Modelled estimate, not financial advice.
AU postcode — rebate eligibility is postcode-gated
what you have now
household size (drives hot water demand)
an eligible locally made unit, which raises the Victorian caps
tenure — gates the means-tested state rebates
property value — Solar Victoria requires under $3,000,000
true if the existing system is failing and you were replacing it anyway
combined owner taxable income, for means-tested schemes (Solar Victoria caps at $150,000)
age of the system being replaced; Solar Victoria requires at least 3 years
age of the building; Victorian Energy Upgrades requires at least 2 years
true if hot water is your last gas appliance, so the daily supply charge can be avoided
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Use when someone asks whether a heat pump hot water system is worth it in Australia, which rebates they can stack, how much a heat pump costs after rebates, or how long it takes to pay off — including "can I combine the STC rebate with Victorian Energy Upgrades or Solar Victoria", "do I qualify", and "is a heat pump cheaper to run than gas". Given a postcode, the current hot water system and a few household facts, returns the rebates actually stackable at that postcode (with each scheme's eligibility gates and source), the net-of-rebate outlay, the payback period, and which term — rebates, the avoidable gas supply charge, the energy saving, or a replacement you were buying anyway — is really carrying the decision. Modelled estimate, not financial advice.
| Argument | Type | Description |
|---|---|---|
| people | number | household size (drives hot water demand) |
| postcode* | string | AU postcode — rebate eligibility is postcode-gated |
| locally_made | boolean | an eligible locally made unit, which raises the Victorian caps |
| current_system* | string | what you have now |
| owner_occupier | boolean | tenure — gates the means-tested state rebates |
| property_value | number | property value — Solar Victoria requires under $3,000,000 |
| replacement_due | boolean | true if the existing system is failing and you were replacing it anyway |
| household_income | number | combined owner taxable income, for means-tested schemes (Solar Victoria caps at $150,000) |
| system_age_years | number | age of the system being replaced; Solar Victoria requires at least 3 years |
| building_age_years | number | age of the building; Victorian Energy Upgrades requires at least 2 years |
| gas_only_for_hot_water | boolean | true if hot water is your last gas appliance, so the daily supply charge can be avoided |
{
"type": "object",
"required": [
"postcode",
"current_system"
],
"properties": {
"people": {
"type": "number",
"description": "household size (drives hot water demand)"
},
"postcode": {
"type": "string",
"description": "AU postcode — rebate eligibility is postcode-gated"
},
"locally_made": {
"type": "boolean",
"description": "an eligible locally made unit, which raises the Victorian caps"
},
"current_system": {
"enum": [
"gas_storage",
"gas_instant",
"electric_resistance",
"none"
],
"type": "string",
"description": "what you have now"
},
"owner_occupier": {
"type": "boolean",
"description": "tenure — gates the means-tested state rebates"
},
"property_value": {
"type": "number",
"description": "property value — Solar Victoria requires under $3,000,000"
},
"replacement_due": {
"type": "boolean",
"description": "true if the existing system is failing and you were replacing it anyway"
},
"household_income": {
"type": "number",
"description": "combined owner taxable income, for means-tested schemes (Solar Victoria caps at $150,000)"
},
"system_age_years": {
"type": "number",
"description": "age of the system being replaced; Solar Victoria requires at least 3 years"
},
"building_age_years": {
"type": "number",
"description": "age of the building; Victorian Energy Upgrades requires at least 2 years"
},
"gas_only_for_hot_water": {
"type": "boolean",
"description": "true if hot water is your last gas appliance, so the daily supply charge can be avoided"
}
}
}