Hey Tracs, my garage is nearly identical to yours except I have 2 - 18 x 72 triple pane windows, insulated the thickened edge and have 100amp in garage. Sized up for 7 or 8kw boiler. I went with the Leb8. For the most part I keep it at 10c but had it up to 20c for a week in Dec. while doing some...