In this article, we talk about whether an indoor or an outdoor wood boiler is more useful. We will address three primary portions that cover installation, application, and maintenance. We examine the wood boilers side by side so you can choose which one best fits your requirements and way of life.


In general, it is more difficult and demanding to build an indoor wood boiler. This is a consequence of the necessity for additional expansion tanks, auto-fill valves, pressure release valves, and other equipment in pressurized indoor wood boiler systems. In this scenario, the non-pressurized open loop systems, which effectively only cycle the water in a loop, make it simpler to build outdoor wood boilers.


The outdoor wood boiler utilizes more space because of the established limitations. The indoor boiler is your best alternative if you have limited space since there is no law dictating how far they should be from other people’s houses. On the other hand, internal wood boilers typically have a firebox that is just around three feet in size. This makes it possible for you to keep less wood and other items inside of it, which results in a burn time of just 6 to 8 hours. On the other hand, the outdoor wood boiler has a substantially bigger firebox, which leads to burn times of 12 to 24 hours.

Overall, you will sometimes need to feed the outdoor boiler while often requiring to feed the indoor boiler three to four times each day. Additionally, we talk about how the efficiency of the two boilers is quite close, with the inner boiler slightly exceeding the exterior boiler. Towards the conclusion of the heating season, the indoor boiler could enable you to save around a quart of wood.


The indoor boiler has to be fed three to four times daily, whereas the outdoor wood boiler simply needs to be fed once or twice daily. The smaller chamber of the indoor means that it has more heat exchangers, tubes, as well as ash accumulation, which need significantly more cleaning for weekly and monthly maintenance. Inadequate maintenance may also severely reduce this device’s efficiency.

The traditional outdoor wood boiler just has to be cleaned out of ash once every two to three months. To fit in the little firebox, you must cut the wood for the inside fire down in size. During this process, moving the cut wood from the outside to the inside might introduce dust, grime, insects, and other impurities. You must also empty the ash in your house, which might make a mess and scatter ash everywhere. The same process is carried outdoors, away from the mess, while utilizing an outdoor wood boiler. You should keep your wood out of the elements to make sure it stays dry.

Choose Coal Boiler for A More Cost-Effective Option

Anthracite coal produces the most heat (BTU) of any fuel, including wood, and is a widely available and reasonably priced fuel for many people. When anthracite coal is of exceptional quality, it burns very cleanly. Our Legacy Stoves SF170 and SF270 indoor coal boilers are designed to provide remarkable fuel diversity which allows our users to be able to use pea, nut, or stove-sized anthracite coal.