51H2501

Introducing the Robertshaw Lennox 51H2501 Pulse 7200 G14 G21 Derp Gas Valve Expansion Tank, a high-performance and reliable solution for your heating system needs. This expansion tank, manufactured by the renowned HVAC components brand Robertshaw, is specifically designed to accommodate Lennox Pulse 7200 series gas valves.

Measuring 10 inches in height and 5 inches in diameter, this expansion tank offers an ample volume of 1.3 gallons to effectively absorb the pressure changes that occur during the heating cycle. Its shape conforms to the standard G14 x G21 threaded connection, ensuring seamless integration with your gas valve.

Constructed using premium materials, the 51H2501 expansion tank boasts a robust design that delivers excellent durability and resistance to corrosion. It features a bladder made of high-quality butyl rubber, which provides superior flexibility and sealing ability. The outer tank is crafted from heavy-duty, rust-resistant steel, ensuring long-lasting performance even in demanding environments.

The Robertshaw Lennox 51H2501 Pulse 7200 G14 G21 Derp Gas Valve Expansion Tank comes with a factory-installed, non-return valve that prevents the accidental flow of coolant back into the system when the heating cycle is complete. This feature helps maintain the proper pressure balance within your heating system, ensuring optimal performance and longevity.

Installing the 51H2501 expansion tank is a straightforward process. Simply connect it to your gas valve using the provided G14 x G21 threaded connection and fill it with the appropriate coolant. The tank is designed to accommodate a standard 12-ounce bottle of coolant, making it easy to maintain the recommended coolant level.

In summary, the Robertshaw Lennox 51H2501 Pulse 7200 G14 G21 Derp Gas Valve Expansion Tank is an essential component for your Lennox Pulse 7200 series gas valve-equipped heating system. Its high-quality construction, ample capacity, and easy installation make it a reliable and effective solution for managing pressure changes and ensuring the overall performance and longevity of your heating system.

The Robertshaw Lennox 51H2501 Pulse 7200 Derp gas valve expansion tank is designed for use in residential and light commercial heating systems. This tank is engineered to meet the requirements of ANSI/ASME standard B31.5 and comes with various features that aim to enhance system performance and efficiency. Here are some pros and cons of buying this expansion tank:

1. Compliance with ASME standards: This tank is built to meet the stringent requirements of ANSI/ASME standard B31.5, ensuring safety and reliability.

2. Durable Construction: The 51H2501 Pulse 7200 Derp tank boasts a heavy-duty, corrosion-resistant design. Its fiberglass reinforced polypropylene (FRP) construction provides excellent resistance to cracking, leaking, and corrosion.

3. Compact Design: The expansion tank has a compact design, making it suitable for installation in tight spaces, and its dimensions are 13.5 inches (L) x 7 inches (W) x 13 inches (H).

4. Easy Installation: With its pre-drilled mounting holes, the tank can be easily installed on walls or other suitable surfaces.

5. Air Eliminator: The integrated air eliminator helps prevent the buildup of air pockets in the heating lines, ensuring smooth system operation.

1. Limited Capacity: The 51H2501 Pulse 7200 Derp tank has a capacity of 1.5 gallons, which may not be sufficient for larger heating systems.

2. Limited Temperature Rating: The tank is rated for a maximum operating temperature of 250 F and a maximum working pressure of 150 psi. If your heating system exceeds these specifications, you may need to consider a higher-capacity or higher-temperature tank.

In conclusion, the Robertshaw Lennox 51H2501 Pulse 7200 Derp gas valve expansion tank offers several advantages, including compliance with ASME standards, durability, compact design, easy installation, and an integrated air eliminator. However, its limited capacity and temperature rating may make it unsuitable for larger or more demanding heating systems.

If you have a smaller residential or light commercial heating system with a low water volume and temperature requirements, the 51H2501 Pulse 7200 Derp tank is an excellent option. However, if you have a larger system with higher water volume and temperature requirements, you may need to consider a more substantial expansion tank that can accommodate your system's demands.

Details:

The details: full assembly: includes the Robertshaw 7200 derp valve, integrated pressure regulator, and factory steel expansion tank manifold. Packaging: securely packaged: 16x10x9; weighs 7.5lbs. Condition: excellent. I have a number of other parts listed from dismantling this furnace.

Up for sale is a genuine Lennox pulse gas valve assembly featuring the Robertshaw 7200 derp valve. Function: this valve is the gatekeeper for your furnaces fuel supply, specifically calibrated high-frequency pulses of g14/g21 series. This was removed from a fully operational furnace that only decommissioned due to heat exchange issue. The gas valve is clean, and the expansion tank solid.

No known damage.

specifications centrafurn:

• brand: Robertshaw / Lennox
• mpn: 51h2501
• model: 7200 Derp
• type: Gas Valve Regulator Assembly
• power source: Gas
• heating system: Furnace

seller centrafurn:

• city: bristol, indiana
• # reviews: 26
• rating: 100.0%

shipping centrafurn:

• class: standard
• service: usps ground advantage
• type: calculated
• transit: 5-11 days
• carrier: usps

general centrafurn:

• category: Home & Garden > Heating, Air > Cooling Systems > Central Furnaces

returns centrafurn:

• policy: no returns

offer centrafurn:

• prices: $15.00–$398.00
• item condition:
  • New
  • Used
  • New – Open box
  • For parts or not working
  • Open box
  • Seller refurbished
• options: ship-to-home
• started: march 28, 2026
• availability: in stock
• sold #: 8
• best offers: true
• in stock #: 5

payments centrafurn:

• credit card: diners-club
• wallet: apple-pay
• other

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