Hydrotherm 02-1552 Gas Valve

The Hydrotherm 02-1552 Gas Valve (also identified as 021552) is a heavy-duty, 24V standing pilot natural gas valve engineered for precision fuel regulation in commercial and industrial boilers and furnaces. As a high-capacity combination gas control, this unit integrates a safety shutoff, manual valve, dual automatic operators, and a pressure regulator into one compact housing. It is a direct OEM match for many Hydrotherm heating systems and cross-references with the Honeywell VR8300 series, specifically the VR8300C4043, providing a rated capacity of up to 200,000 BTU/hr.

Designed for professional field replacement, this natural gas valve features standard 1/2" x 1/2" NPT inlet and outlet connections and a 1/4" C.C. pilot outlet. The adjustable servo regulator maintains a steady 3.5" W.C. output despite supply pressure fluctuations, ensuring high combustion efficiency. With its "LITE-RITE" (OFF-PILOT-ON) sequence and top-mounted wiring terminals, this HVAC replacement part simplifies troubleshooting and installation for technicians managing standing pilot ignition assemblies.

• OEM Compatibility: Exact replacement for Hydrotherm 02-1552 and 021552 part numbers.
• Dual Automatic Operators: Provides redundant safety shutoff on every call for heat.
• Universal Voltage: Operates on standard 24VAC control circuits found in most hydronic systems.
• High Capacity: Supports gas-fired appliances ranging from 30,000 to 200,000 BTU/hr.
• Serviceability: All pressure taps and adjustments are accessible from the top for easy manometer readings.

Is the 02-1552 interchangeable with the 021552?
Yes, these part numbers refer to the same standing pilot gas valve. The 02-1552 is the standard industry format, while 021552 is often used in digital inventory catalogs; they are physically and functionally identical.

Can this valve be used for Propane (LP) applications?
This specific model is factory-configured for Natural Gas. While some Honeywell VR series valves allow for conversion, a specific LP conversion kit must be used to ensure the regulator spring and orifice are correctly calibrated for liquid propane pressures.

What is the proper mounting orientation for this valve?
The valve can be mounted anywhere from 0 to 90 degrees from the upright position. For maximum component life, avoid installing the valve upside down (knob facing the floor).

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.