I am staying up late 2nite watching my new econoburn 150. It's 2:30 and I am making sure that my boiler doesn't overheat I switched my 100 to the 150 today and oh my word I am happy beyond description. My 150 is set at 170 and the fan is idling but it is still putting out enough heat to heat all my panel radiators, infloor, and 512gal. storage, and i got the heater in my garage set at 40 to get rid of the extra heat. Didn't install the overheat gravtity loop yet,because we needed a fitting for the aquastat. Glad I have the heater in garage to disapate the heat, but don't dare go to sleep yet. Looking forward to hooking up domestic HW and adding a few more controls to the system. Also thinking about more storage The 150 is truly AWESOME. Thanks to Marc at Econoburn, you have been very good to deal with.