Heats water via a flame and then distributes the water or steam through pipes to the rest of the house

Fuel Types: Natural Gas, propane, oil, electricity, biodiesel blends

Life Span: 15-30 years

Cost: $$ to $$$$ (depends on fuel type)

Pros: Easier to heat only certain areas of home

Cons: Expensive to install, requires minimum temperature to prevent pipes from freezing