Boiler vs Furnace
Both heat your home effectively — but they do it very differently. Here’s an honest, side-by-side comparison to help you choose the right system for your home, comfort, and budget.
| Factor | Boiler | Furnace |
|---|---|---|
| Heat method | Hydronic — heats water for radiators, baseboards, or radiant floors | Forced air — heats and blows air through ducts |
| Comfort | Even, quiet radiant warmth; no drafts | Fast warm-up; can feel drafty with temperature swings |
| Air quality | No blown dust or allergens; better humidity | Circulates air and dust; can dry the air |
| Efficiency | Up to 95–98% AFUE (condensing) | Up to 96–98% AFUE (condensing) |
| Hot water | Combi units also provide domestic hot water | No — needs a separate water heater |
| Cooling | Needs a separate system for A/C | Shares ducts with central A/C |
| Install cost | Higher upfront, especially without existing hydronics | Lower if ducts already exist |
| Lifespan | 15–30 years | 15–20 years |
| Maintenance | Low; annual service recommended | Filter changes + annual service |
The bottom line
Choose a boiler if…
- You want even, quiet, draft-free radiant heat
- You have or want radiant floors or radiators
- Air quality and humidity matter to you
- You want heating + hot water in one (combi)
A furnace may suit if…
- You already have ductwork in place
- You want central A/C sharing the same ducts
- Lowest upfront cost is your priority
- You prefer very fast warm-up
Still deciding? Talk to a specialist
Get free advice and quotes from approved local heating specialists.