Yeah no something is definitely wrong with mine, I load it hard, and it will barely make 12 hrs. Ok was -13F or -25C Overnight. It's my first OWB and still trying to figure it out. I couldn't get my hands on oak logs tho, so i had to get tamarack and red pine. Got sold 15 face cord of splitted 16" hardwood, then been told that wouldn't cut it into this boiler, need round big logs (which i must admit is wayyyyyyyyyyy better than the small wood)
It's also the BL 34 44, but am heating a fairly new 3800SQ house (well insulated house), with a dual car garage and a guess house of 1200 Sq ft + a sidearm for HW. But i barely can last 12 hrs. I did setup a data logger to see when the water temp, and it drop every single night, I am thinking of a buffer tank maybe would help.
Trying to pin point what wrong, i run it at 190C and 178C to restart.
And if you look at the datalogging the probe is about 25F offset, been just taped on the valve to get my temperature reading.