David Meiland suggests the installation may be hampered by the stack effect, in which air leaks in at the bottom of the house and exits near the top of the house.
The outside air duct is probably allowing air inside even when the stove is not running, and should Agnew open the door of the stove when it’s not burning any wood he’d be likely to feel cold air coming down the chimney.
“That’s the way ‘stack effect’ pressures work Wood Fire Direct Melbourne is ” Meiland says. “Your chimney may be functioning as an air inlet whenever it can (i.e. unless you overcome the pressure with a roaring fire). Whenever the range hood, dryer, bath fans, built-in vacuum, etc., are in use, the problem is worse. In addition, your HRV may be unbalanced and causing a negative pressure.”
He thinks the best solution is to replace the stove and connect it directly with a source for outside air. “You need to remove house pressures from the mix here,” he says. “Your house is sucking on your stove.”
Meiland also lives in a tight house, but his Morse stove with a direct air connection burns just fine. One thing you could do is experiment with your HRV,” Meiland adds. Heating Consultant Melbourne Turn it off for a period and burn the stove. If it drafts more reliably, that’s a clue. Another thing you could do is get someone with a manometer (probably a blower door technician) to check things out. In the end, my money is on a different stove.”
Into this mix Dorsett introduces another possibility the 8-inch-diamter chimney flue isn’t matched correctly to the heat output of the stove. With an apparent output of 29,300 Btu/h, the stove might operate better with a flue diameter smaller than 8 inches.
Wood heaters Melbourne Most modern wood stoves work best when the chimney flue is between 100% and 150% of the flue collars cross sectional area,” Dorsett writes. “(Standard practice in retrofits is to use a stainless flue liner of the same size as the stove’s flue collar). Agnew is certain his builder didn’t know how to size a chimney flue, and relied instead on the “bigger is better” approach. As it stands, the chimney flue is about 177% the size of the 6-inch flue collar, “still slightly more than ideal from what you are saying.