Mark 123 Series Parts

The Heatilator Mark 123 was introduced in 1968 and became the biggest selling masonry form in the industry. The Mark 123 fireplaces included many model versions.

We can get all parts currently available for the Mark 123 wood fireplaces. Any Heatilator part that is listed on our site is typically stocked, if you do not see the part you are looking for we can order it in. If you can not find the part you are looking for please call, e-mail or fill out our Parts Request Form and we will be happy to assist you.

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  • HHT High Temp Red Silicone (SIL-HT-RED)
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    HHT High Temp Red Silicone (SIL-HT-RED)

    Replacement high temp red silicone for HHT gas, pellet, and wood stoves. May fit many models, please check your owner’s manual for part number compatibility. NOTE:  Due to DOT regulations, this item cannot be shipped by air and must...
    $13.00
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  • HHT Grate Assembly (GR40)
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    HHT Grate Assembly (GR40)

    Replacement grate assembly for Heat N Glo, Heatilator and Outdoor Lifestyles wood fireplaces. This part measures 21-9/16" x 10-1/2" x 6-3/4". Fits the following models:Heatilator Wood...
    $169.00
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Why Buy Parts from Mountain View Hearth Products?

We’re the world’s largest source for stove, fireplace, grill, and appliance repair parts. Whether you’re fixing a decades-old wood stove or replacing a worn-out control board on a high-end grill, we make it easy to get the right part — fast.

We stock both original manufacturer parts and high-quality alternatives — so you get the same great fit and performance, often with more affordable options to choose from.

Most sellers only carry the basics like blowers and igniters. We go deeper — with brackets, trim, switches, control panels, gaskets, screws, and more. If your unit has it, chances are, we carry it.