How Much Does a Boiler Cost?
A new boiler costs $5,000-$12,000 installed for a standard gas boiler and $7,000-$15,000+ for a high-efficiency condensing model. Boiler repair costs $200-$800 for common issues. Oil boilers cost 10-20% more than gas. Electric boilers are cheapest to install but most expensive to operate.
Cost Breakdown
| Service | Low | High | Notes |
|---|---|---|---|
| Standard gas boiler (installed) | $5,000 | $8,000 | 80-85% AFUE |
| High-efficiency condensing | $7,000 | $15,000 | 90-98% AFUE |
| Oil boiler (installed) | $6,000 | $12,000 | Where no gas available |
| Electric boiler (installed) | $2,000 | $5,000 | Cheapest install, priciest to run |
| Boiler repair | $200 | $800 | Common issues |
| Annual maintenance | $100 | $300 | Recommended yearly |
Boiler Costs in 2026
By Type
Standard gas boiler ($5,000-$8,000 installed): 80-85% AFUE efficiency. Reliable and proven. The most common choice for replacement in homes with existing gas boilers.
High-efficiency condensing boiler ($7,000-$15,000 installed): 90-98% AFUE efficiency. Extracts more heat from combustion gases by condensing water vapor. Saves 15-30% on fuel costs vs standard boilers. Requires condensate drain.
Oil boiler ($6,000-$12,000 installed): Common in the Northeast where natural gas is not available. Requires oil tank and regular fuel delivery. Slightly less efficient than gas.
Electric boiler ($2,000-$5,000 installed): Cheapest to install, no venting needed, 99% efficient. But electricity is the most expensive fuel — operating costs are 2-3x gas. Best for mild climates or supplemental heating.
Boiler vs Furnace
Boilers heat water and distribute via radiators or in-floor radiant tubing. Furnaces heat air and distribute via ductwork. Boilers provide more even, comfortable heat with better humidity control. Furnaces heat faster and cost less upfront.
Installation Factors
- Removal of old boiler: $500-$1,000 (included by most installers)
- New venting: $500-$1,500 if switching to high-efficiency (needs PVC, not metal chimney)
- Zone controls: $500-$2,000 for multi-zone thermostats
- Permits: $100-$300 (required in most areas)
Related Questions
How long do boilers last?
Gas boilers last 15-20 years, oil boilers 15-25 years, and cast iron boilers can last 30+ years with proper maintenance. Annual service is the single biggest factor in boiler longevity.
Are high-efficiency boilers worth the extra cost?
If you plan to stay in your home 10+ years, yes. A condensing boiler saves $300-$700 per year in fuel costs. Over 15 years that is $4,500-$10,500 in savings — more than the price difference.
Can I switch from oil to gas?
Yes, if natural gas is available on your street. The conversion costs $3,000-$5,000 on top of the new boiler for gas line installation. Long term, gas is about 30-40% cheaper than oil per BTU. Many utility companies offer conversion incentives.