owner

I have a older "the Jack line" indoor wood boiler.Made in Warrens Wis.by Walker Ind.Inc.  It is a good boiler,I am wondering how to get  the water temp up higher.I am burning dry Red Oak.If i HAVE THE DRAFT ON AND THE ASH DOOR OPEN IT WILL GET TO 135  degrees.It usually runs around 90*.A friend has an outdoor wood boiler and his runs around 180*He says he does not put in alot more wood than i do.I fill the wood box.Are there any suggestions on uping the water  temp?IT works pretty good at around 90* but we have been expierencing many temps in the -20 below for a long time this winter in Northern ,MN. Thanks Mork