Robertshaw 4200-025 Gas Thermostat

The Robertshaw 4200-025 Gas Thermostat is a heavy-duty, high-capacity commercial control designed for precision temperature management in professional kitchen environments. This FDO model thermostat operates within a 150°F to 550°F range, making it a versatile solution for commercial deck ovens, convection ranges, and fryers. Engineered for durability, it features a 54-inch nickel-plated copper capillary and a 3/16" x 14-3/4" sensing bulb that ensures rapid response to thermal shifts. The 3/8" NPT pipe connection (inlet and outlet) simplifies integration into existing gas lines, supporting both Natural Gas and Liquid Propane (LP) configurations. As a modulating gas control, it maintains consistent heat levels by adjusting gas flow rather than simple cycling, which improves cooking results and fuel efficiency in high-demand settings. This 4-way mounting unit replaces multiple OEM part numbers for brands including Alto-Shaam, Garland, and Hobart, providing technicians with a reliable, universal-fit replacement for standard commercial kitchen equipment repairs.

• High-Temperature Versatility: The 150°F to 550°F range accommodates everything from low-temp holding to high-heat roasting.
• Robust Construction: Built with a rugged FDO body and heat-resistant materials specifically for the rigors of a commercial line.
• Universal Compatibility: Serves as a direct replacement for Hobart 407522-1, Garland 1017500, and Alto-Shaam 03395-2.
• Precise Control: Features adjustable pilot and bypass keys for fine-tuning gas flow during installation.
• Flexible Installation: The 4-way mounting position allows for adaptable orientation in cramped equipment cabinets.

Is the dial included with this Robertshaw gas thermostat?

Yes, the 4200-025 kit includes the thermostat body, a matching black 150-550°F dial, and the necessary installation hardware for immediate field replacement.

Can this thermostat be used with both Natural Gas and Propane?

Correct. This unit is rated for NG/LP fuel types. Ensure you follow local codes and manufacturer procedures for orifice and bypass adjustments when switching gas types.

How do I troubleshoot a burner that won't reach the set temperature?

First, verify the sensing bulb is properly seated in its mounting bracket and free of debris. If the bulb position is correct, inspect the bypass flame adjustment; if the bypass is set too low or the capillary is kinked, it may prevent the burner from maintaining the required heat output.

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.