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Outdoor wood boiler water treatment: safe and effective treatment of outdoor boiler water is the most important. Hawken is a dedicated team of experts in outdoor wood boilers and there are no problems or concerns that Hawken can't solve! they spent more than a year looking for an outdoor wood stove, but always returned to the outdoor boiler. Reasons to keep your stove above 140 degrees! Angry about what they did? They are great! History of outdoor boilers. If you have any specific questions, please email to: you made a big investment in your furnace system, so you deserve a big return. Just contact any of their great team members! You will also automatically enroll to receive their exclusive newsletter, which contains monthly operating and maintenance tips, seasonal reminders, and their customers' favorite jokes for the month!