System Type Installed Cost STC Rebates Notes
Electric Storage $1,200 – $3,000+ ❌ Cheapest, but high running cost
Gas (Storage/Instant) $1,200 – $2,500+ ❌ / Limited Great if already on mains gas
Solar Hot Water $4,000 – $7,500+ ✅ Ideal for sunny roofs
Heat Pump $2,800 – $7,500+ ✅ Efficient & flexible placement