Question about Rinnai Toyostove Direct Vent Heater: Toyostove Laser 73 Shipping

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Laser 73 Heat exchanger loose part

Hey Guys,

On my Laser 73, when I took the heat exchanger off, I discovered that there is a loose piece of metal inside the lower chamber. It is just sliding around. I'm guessing it is some sort of baffle to direct the air flow into the upper chamber, before being routed down through those 14 tubes, and out through the blower motor.

Any thoughts would be appreciated.

Thank you,

Mike U.

Posted by on

  • g_m_urban1 Mar 09, 2009

    Thanks Tom, I'll look into that. Definitely will keep/rebuild this heater.
    But you know, the color of the Stainless Steel on the heat exchanger does not look bad, and there is no warping. You definitely think it's a goner? How is that baffle situated int the exchanger?

    Mike U.

  • g_m_urban1 Mar 10, 2009

    Thanks Tom. Just wanted to be sure. I will definitely completely rebuild this heater. I've gotten some 13 years out of it, so if I could get another 5 or 10 years from her, I would be thrilled.

    It is hands-down a great heater, and I would not hesitate to buy another.

    Again, thank you for you expertise.

    Best regards,

    Mike U.



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As I mentioned in the last post, you are in need of a big overhaul. The heat exchanger baffle that has become detached is a sign of a heater that has been running very hot. When you get down into the burner you may find a warped bottom. If so, you are looking at a new burner, and heat exchanger. The burner ring and several gaskets will also need replacing. All the above will run around $600+. Despite the high cost of parts you are better off rebuilding than buying new by $1000 or so. When you look at it in the long run you are spending $60 or so a year for the 10 years you have owned the unit. Not bad, I'd say.

good luck,

Tom Hawkins

Posted on Mar 09, 2009

  • Thomas Hawkins Mar 10, 2009


    Trust me, it's a goner. The baffle is welded before exchanger is put together. The heat from the burner hits the baffle first. That is one of the hottest parts of the heater. Your burner mat has been gone for some time and the ring has warped. This and the chance the pot is warped causes a hot flame that leaps high in the chamber. It hit the baffle in the exchanger and you're done.

    Tom Hawkins



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