Gas vs Heat Pump Hot Water Comparison

System & Cost Settings

Daily Hot Water Demand (Litres / Day)

Your Local Climate Profile

Your Gas Tariff ($ per MJ)

Your Electricity Tariff ($ per kWh)

Hardware Specifications

New Gas Storage Installed Cost ($)

Heat Pump Installed Cost (Net of Rebates) ($)

New Dedicated Electrical Circuit Cost ($) *Note: Required for gas-to-heat-pump conversions since most old gas tanks have no mains power. Typical cost ranges from $400 to $1,200 depending on switchboard distance.

Performance Comparison

Metric	Gas Storage	Heat Pump
Typical Tank Sizing	135L – 170L	270L – 300L
Expected Lifespan	10 - 15 Years	7 - 10 Years
Tank Warranty	7 - 10 Years	Most 5 Years
Compressor/Electronics Warranty	N/A (No Moving Parts)	1 - 2 Years

Annual Run Costs & Recovery Speeds

Gas Run Cost

Based on ~75% thermal efficiency

Heat Pump Run Cost

Based on average COP of 3.5

Full Recovery Reheat Time (If Fully Drained)

🔥 Gas Storage: Approx. -- mins

🌀 Heat Pump: Approx. -- mins

Assumes a standard 135L Gas Tank vs a 270L Heat Pump Tank.