Laser 56, 73 fuel leveler pipe

[hawkins111]

Toyotomi has dropped the fuel leveler pipe (20475952) for the Laser 56 heater from the inventory. This pipe was set up to include a fire safety valve.


The Laser 560 fuel leveler (20470452) will work and reach out to the outside of the back of the Laser 56 heater. The only problem is that there is no fire safety valve. If you replace the Laser 56 heater fuel leveler pipe with a new L560 fuel line a fire safety valve should be installed inside the home.


I am sure Toyotomi will be removing the Laser 73 fuel leveler line (20475852) in the near future as well.


Work space behind a L73 or Laser 56 heater is limited. A fuel line that comes straight out of the wall and into the heater will need to be modified. If you are replacing the fuel leveler line on either of the older Laser heaters you will need to re drill the fuel line to make room for the fire safety valve.

[hawkins111]

No, the new Toyotomi Laser 730 fuel sump does not have a built-in thermal fire safety (fusible link) valve, nor does the Laser 730 require the external fusible link valve used on older models. Instead, the updated sump (Part #20470234) includes a built-in overflow/tip-over float shutoff and is constructed from aluminum to meet safety standards without a fusible link. [1, 2]
Key Differences in the Laser 730 Fuel Sump

• Material Change Eliminates Internal Fusible Link. Older models like the Laser 73 used a zinc fuel sump (Part #20478534) paired with an external inline fusible link fire valve (Part #10005597) because zinc has a lower melting point. According to the Toyotomi Modified Parts Comparison, the Laser 730 fuel sump (Part #20470234) changed from zinc to aluminum, meaning no fusible link valve is required on the unit. [1, 2]
• Built-In Float Shutoff Mechanism. Per the Toyotomi Laser 730 Service Manual, the constant level valve inside the sump still features a mechanical automatic shutoff. This safety float trips to block fuel flow if the sump begins to flood or if the heater is jarred or moved, requiring you to press the manual reset button on top of the sump to restore flow. [1]
• External Line Recommendations. While the heater itself does not use a built-in fusible link valve, the Toyotomi Laser 730 Installation Manual still recommends installing an inline fusible link shutoff valve on your supply line if the manual fuel shutoff valve is located inside the building. Local building or fire codes may also still require an inline Firomatic-style fusible valve where the fuel line enters the structure. [1]

[dntreecareinc]

Thanks for the heads-up on the discontinued part, and for spelling out the fire safety valve issue. That is the part I would not skip, especially with the limited space behind a Laser 56 or 73. If anyone does the swap to the Laser 560 leveler, I would make sure the inline fusible link valve is still in the line and easy to reach, double-check the new hole and all the connections for leaks before firing it up, and follow the manual for the model you actually have. If the valve placement or the re-drilling is not clear, that is a good point to stop and check with a qualified heater technician rather than guessing.