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 4
1
2
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5
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10
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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