Five Wood Boiler FAQs

What is an outdoor wood boiler and how does it work? A heating device that burns wood to produce hot water, which is then circulated to heat a building. It's usually located outside the main structure and connected to the indoor heating system through pipes, with a heat exchanger inside transferring heat to a forced-air furnace or hydronic system.

What are the benefits? Lower heating costs, increased energy independence, and a reduced carbon footprint compared to heating systems that rely on fossil fuels.

What types of wood can be used? Most outdoor wood boilers can burn any wood species, though seasoned, dry wood is recommended for best performance and minimal creosote. Some models, like the Multi Pass, can also burn other biomass including coal.

How often does it need refilling and maintenance? This depends on usage and boiler size, but most owners refill once or twice a day. Weekly cleaning takes 5 to 15 minutes, plus a more thorough end-of-season shutdown cleaning once a year.

Are outdoor wood boilers safe to use? Like any combustion heating device, they can pose a fire hazard if not used and maintained properly. Follow the manufacturer's instructions, have the chimney inspected annually, and maintain adequate ventilation and clearances around the boiler.