Weil McLain 381-800-826 Gas Train

The Weil McLain 381-800-826 Gas Train is the factory gas control assembly for the Weil-McLain EG-75 PIDN gas-fired cast iron boiler. It is the group of parts that meters fuel to the burner and lights it. The product photo shows a gas valve with PV and MV terminal markings, a long slotted burner tube with its bracket, the pilot and ignition assembly with ceramic-insulated electrodes and leads, thermal switches, and a pail of non-asbestos furnace and retort cement. Weil-McLain lists the gas control for the EG-65 PIDN separately as 381-800-825, so the number you order is set by boiler size: the 381-800-826 is the EG-75 assembly.

On a gas boiler with intermittent pilot ignition, the ignition control module runs the sequence. On a call for heat it opens the pilot valve (PV) and fires the spark electrode, proves the pilot flame through the flame sensor, and only then energizes the main valve (MV) so gas flows through the manifold and main burner orifice into the burner tube. The valve's built-in regulator holds manifold pressure steady while the burner runs. For the EG-75, Weil-McLain's series 6 parts list shows the related burner components as separate numbers: manifold 591-125-542, the 2.30 mm natural gas main burner orifice 560-528-975, the stainless burner tube 512-200-000 (or 512-200-001 with the pilot bracket), the spill switch 510-300-013, and the base front access panel with flame rollout switch bracket 451-800-044. Other numbers in the same family include the gas control valve 381-800-823 and the EG-75 base assembly 381-800-834.

Before condemning the gas train, confirm it is the actual fault. A pilot that will not light or hold, a main burner that never opens, delayed ignition, a yellow or lifting flame, or a gas odor at the valve all point at it. A no-heat call also comes from missing 24-volt control power, a tripped limit or spill switch, a blocked flue, low gas supply pressure, a dirty flame sensor, or a failed ignition control module, and those are quicker to rule out first. When you replace the assembly, shut off the gas and the power, move wiring one lead at a time against the wiring diagram, then leak-test every gas connection with an approved solution, check manifold pressure and flame appearance, and run the boiler through a full cycle. Confirm that the gas type on the rating plate matches the burner components, and leave gas work to a licensed technician.

Key Benefits

• Factory Assembly For The EG-75 PIDN: Listed by Weil-McLain for the EG-75 boiler, so the valve and burner hardware match the unit it was built to serve.
• Valve, Burner, And Ignition Hardware Together: The assembly pictured brings the gas valve, burner tube, pilot and ignition parts, and thermal switches into one order instead of several.
• Right Number For Your Boiler Size: The EG-65 PIDN uses 381-800-825 and the EG-75 uses 381-800-826, so the size on the rating plate decides the part.
• OEM-Specified Parts: Built to Weil-McLain's own specification rather than a universal gas valve kit that has to be adapted to the boiler.

Common Questions

• What boiler does it fit? The Weil-McLain EG-75 PIDN gas boiler. Match the model, series, and gas type on the rating plate before ordering, because the same family carries different numbers for the other sizes.
• What is in the assembly? The product photo shows the gas valve, burner tube, pilot and ignition hardware, thermal switches, and furnace cement. Contact our team to confirm the exact contents against your boiler's parts breakdown.
• How do I know the gas train is the problem? Check control power, gas supply pressure, the flame sensor, and the ignition control module first; if the pilot lights but the main valve will not open or the flame is poor, the gas train is the next suspect.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.