Size:

First of all you should really consider sizing your outdoor wood boiler ( and really spend time on this) >If you’re replacing an existing oil furnace then this makes sizing much easier. It is very important not to oversize the BTU’s just because you want to be safe. What they can mean is that your new boiler is not working optimally for you and either wasting wood or getting clogged up with creosote because it is not burning at regular intervals throughout the day and night.

Weight:

If you’re a new buyer of Outdoor Wood Boilers (OWB) you really need to look at several characteristics of the stove other than price and BTU’s. I suggest that you strongly consider the weight or mass of the OWB.
When I was looking at buying my first boiler I was shocked to see the difference between a Polar furnace and the rest of the competitive boilers. If you look at weight as the factor in determining quality, well then you might have something. Weight means more steel , and more steel means a longer life boiler or a lifetime boiler (if well taken care of).

I saw that the Polar G2 unit with 60,000 BTUs has 835 more pounds than the Classic Edge 360 and 752 pounds more than the Heat Master G4000. Weight is more costly to ship, but in the end you get a better operating stove with no computer issues, and does not need a programming degree or your dealer has to come out and wipe the computer and reset the Programming Logic Controller.

I chose my furnace based on longevity and you are going to make an investment in an OWB. You need to know that in the end you’re going to get your money’s worth. When dealing with heating temperatures up to 2000 deg F you need to know that the fire brick and metal can hold it all together with that 835 lbs more of steel. Polar outdoor wood stoves are made in Canada and use controllers that have been proven in most every basement for 60 + years. It is simple so you can count on the boiler working day in and day out.