As of 2015, natural gas boilers provide the most cost-effective means of heating a home. While fossil fuel prices fluctuate over time, natural gas prices are projected to remain relatively stable compared to oil.
Thanks to advanced drilling techniques, the amount of available natural gas in North America has increased significantly, leading to its use as a fuel source. Gas boilers also operate more efficiently than oil boilers and are cheaper to purchase and install.
Boilers are more efficient than furnaces, particularly for large structures. Due to their lower operating temperatures, hot water heat distribution systems provide better efficiency than comparable steam systems, regardless of the fuel used.