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Boiler Replacement Payback Calculator
Condensing boiler replacement saves 15-30% vs legacy; major capex but strong ROI.
Payback years
9.1
Annual savings
$8,000
Net cost after rebate
$73,000
How the math works
Savings = fuel × efficiency + maintenance. Net = replacement − rebate.
$25k × 22% + $2,500 = $8k/yr. $85k − $12k = $73k net. 9.1 yr payback.
How to Use
- Enter boiler replacement cost.
- Enter current annual fuel cost.
- Enter efficiency improvement %.
- Enter maintenance savings.
- Enter utility rebate.
- Read payback.
Frequently Asked Questions
Condensing vs conventional?
Conventional/atmospheric boiler: 65-80% efficient. Condensing boiler: 90-97% efficient. Efficiency gain: 15-30% fuel savings. High-efficiency: requires PVC venting (not steel chimney). Return water temp critical (<130°F for condensing mode). Cost: condensing boiler $8-30k vs conventional $4-15k for small commercial. Large commercial: $30-150k vs $20-80k conventional.
Fuel savings?
Office/apartment 20k sqft, $15,000 annual gas. 20% efficiency improvement: $3,000/yr savings. 10-year building: $30k saved. Larger buildings (100k sqft+ commercial): $15-75k annual savings possible. Climate matters: heating-intensive regions (NYC, Chicago, Boston, Minneapolis) see better ROI than mild climates. Peak demand reduction: also lowers capacity charges.
Utility rebates?
ConEd (NY): $2,500-15,000 per boiler. National Grid: $3,000-20,000. PSEG (NJ): $2,000-12,000. Eversource (MA): $5,000-25,000. Midwest: $1,500-10,000. Based on size (BTU) + efficiency rating (AFUE 95%+ typical qualifying threshold). Stack with 179D commercial deduction + possible state tax credits. Total incentives often cover 20-45% of project cost.
IRA tax credits?
Commercial heat pump/geothermal: 30% ITC (48E). Direct-fire boilers: generally not qualified for ITC but qualify for 179D deduction. Energy efficiency retrofit projects: $0.50-5/sqft deduction. Non-profit/municipal: direct pay option (refund of credit). Projects >$1M: tax equity finance may recapture value. Consultation with accountant/energy professional important.
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