Regency Hi300 over firing

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sgrmagnolia

New Member
Mar 6, 2023
5
Rhode Island
I have a 1 year old Regency Hi300 insert. It is a replacement for a 18 year old unit that ultimately developed a split in the seem on the top of the firebox. (Manufacturer said lifespan was 15-20 years)

The first year with the unit was fine. Able to load and run like my last one. Fill up at night, close down the draft and still have coals in the morning. This year it wants to over fire with hardly any wood in it. My stove guy who installed it and is very knowledgeable has been through it and found no noticeable issues. He has been on the phone with the manufacturer but still no idea what is wrong with it.

I have a thermometer on top of the box where the air comes out and double checked the reading with a point and shoot thermometer.

With just four splits in it the other night it very quickly got up to just over 600F with the fan on high and the draft just 1/2 inch out. (I made the mistake of closing it down completely with the fan on and it gets stuck in place!) 40 minutes later the wood was burnt down more than I would care for. Or maybe I'm just overthinking it. At the very least, there is no way that I could fill this unit up at bedtime like I used to without over firing it. Myself and the stove guy are at a loss. What else can we check?

I will add that I had a company come to install a liner in the chimney for the oil furnace and they made a hell of a racket drilling out the 40 year old terra cotta tiles that were crumbling. Tons of vibration! They even damaged the fireplace brick but that's another story. Just in case there is reason to believe that this could be a source of the problem.
 
How tall is your chimney? Is this years wood much dryer than last year? Have you checked the gaskets for air leaks? Does the stove have an ashpan that could be seated incorrectly? 600 degrees is not an overfire.
 
So what temperature is overfire?
How tall is your chimney? Is this years wood much dryer than last year? Have you checked the gaskets for air leaks? Does the stove have an ashpan that could be seated incorrectly? 600 degrees is not an overfire.
Not sure on exact height. Two story cape with insert on first floor. Stove guy checked all gaskets. The wood is a couple of years old. Around 15% with some lower when tested with moisture meter. They are cut on the smaller side. I’m not sure about an ash pan. Certainly not one that is removable on this unit that I am aware of. It will very quickly go over 600F and the top of the box in front of the flue will glow red so definitely over firing.
 
Not sure on exact height. Two story cape with insert on first floor. Stove guy checked all gaskets. The wood is a couple of years old. Around 15% with some lower when tested with moisture meter. They are cut on the smaller side. I’m not sure about an ash pan. Certainly not one that is removable on this unit that I am aware of. It will very quickly go over 600F and the top of the box in front of the flue will glow red so definitely over firing.

A key damper may be needed, tougher to do on an insert but not impossible. Small dry splits are going to take off, pack it tighter and turn it down sooner.
 
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