Boiler Replacement ROI & Gas Savings Calculator
See how much gas you'd save by switching to a condensing boiler, and — after subsidies — how many years until it pays for itself.
🔥 Current Boiler
📈 City Gas Usage
Enter average monthly usage (m³) including winter.
🏷️ Subsidy Conditions
📊 Replacement ROI Result
Payback period
3.7년
Net cost after subsidy ÷ annual savings
Gas savings rate
23%
Efficiency
71% → 92%
Current boiler → Condensing
Annual savings
150,652원
Monthly savings
12,554원
Annual gas saved: 137 m³
Cost & Subsidy
- Condensing replacement (est.)
- 850,000원
- MOE subsidy (national)
- − 200,000원
- Local subsidy
- − 100,000원
- Net cost after subsidy
- 550,000원
10-year cumulative savings
Break-even: Year 41
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Before payback After payback10-year net cumulative: 956,522원
Price & Factor Sources
- 🔥 Condensing efficiency: eco-friendly grade-1 seasonal efficiency ~92% (est.)
- 💧 City gas price: residential heating ~1,100 KRW/m³ (est., varies by region/tier)
- 🏷️ Subsidy: MOE eco boiler 200k (general) / 600k (low income) + local (2026 est.)
- 🧰 Replacement: condensing install ~700k–1.3M KRW by home size (est.)
※ All values are reference estimates. Actual price/subsidy/cost vary by region, model, and installer.
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