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  1. Home
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  4. Boilers
  5. Dunkirk WPSB-3D Series II Boiler w/ Draft Diverter w/ Taco Pump, Natural Gas, 75 MBH In, 63 MBH Out, 5" Flue - WPS307503210203

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Dunkirk WPS307503210203 Dunkirk WPSB-3D Series II Boiler w/ Draft Diverter w/ Taco Pump, Natural Gas, 75 MBH In, 63 MBH Out, 5
View 2 of Dunkirk WPS307503210203 Dunkirk WPSB-3D Series II Boiler w/ Draft Diverter w/ Taco Pump, Natural Gas, 75 MBH In, 63 MBH Out, 5
View 3 of Dunkirk WPS307503210203 Dunkirk WPSB-3D Series II Boiler w/ Draft Diverter w/ Taco Pump, Natural Gas, 75 MBH In, 63 MBH Out, 5
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View 5 of Dunkirk WPS307503210203 Dunkirk WPSB-3D Series II Boiler w/ Draft Diverter w/ Taco Pump, Natural Gas, 75 MBH In, 63 MBH Out, 5

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Dunkirk WPSB-3D Series II Boiler w/ Draft Diverter w/ Taco Pump, Natural Gas, 75 MBH In, 63 MBH Out, 5" Flue - WPS307503210203

SKU: 389154
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Product Details

Manufacturer: Dunkirk
Product: Boiler
Color: Blue
Modus Operandi: Natural Gas
Mount Type: Floor Mount
Other Info: Taco Pump Included
Electrical Voltage: 120VAC, 60Hz
Capacity: 6.3 Gallons
BTU Rate: 75,000 BTU
Connection Size: 1/2"
Connection Type: NPT
Width: 11-1/4"
Height: 36-3/8"
Depth: 26-1/2"
  ASME Certified
  AHRI certified
Material: Cast iron
  Floor Mount
Water Connection: 1-1/4" NPT
Amperage: 15 amps
Mpn # WPS307503210203
Shipping Dimensions 27.0" x 12.0" x 37.0"
Weight 306.00 lbs.

About the Dunkirk WPS307503210203

About the Dunkirk WPSB-3D Series II Boiler w/ Draft Diverter w/ Taco Pump, Natural Gas, 75 MBH In, 63 MBH Out, 5" Flue - WPS307503210203

Ensure consistent and efficient heating with this boiler!


The Dunkirk WPSB-3D Series II WPS307503210203 boiler is an efficient and reliable choice for home heating, offering an 84.0% AFUE rating for optimal fuel usage. With a size of 75 MBH, this gas-fired hot water boiler ensures dependable performance with its cast iron heat exchanger and cast iron push nipples. The materials expand at the same rate when heated, allowing the boiler to maintain a tight seal over time without the need for cheaper gaskets, ensuring durability and long-lasting operation.


Equipped with the Advanced Fuel Smart Hydrostat Control, this boiler offers three essential functions in one control: a temperature limit, a low water cut-off (LWCO) to protect from low water conditions, and a boiler reset that optimizes fuel savings by adjusting the temperature and activating the burner only when necessary. The setup is straightforward, requiring no outdoor sensor—just dial in the number of heating zones for efficient operation.


This boiler is designed with an atmospheric chimney vent and comes with an integral draft hood and vent damper. These features make it ideal for installations with low clearance, as the integral draft hood reduces the overall height and footprint, providing flexibility in tight spaces. The 1-1/4" return/supply water connections and 1/2" NPT gas inlet ensure ease of installation, while the 6.3 gallons of water content contribute to efficient heating performance. This model includes a Taco Pump.


With a sleek, textured paint jacket for added durability, this Dunkirk WPSB-3D Series II WPS307503210203 is backed by the Cast to Last Warranty, offering a 20-year non-prorated limited warranty to ensure long-term peace of mind. Whether for residential or light commercial applications, this boiler offers the efficiency, reliability, and features you need for year-round comfort.


Dunkirk is known for producing high-quality, energy-efficient heating systems, specializing in gas-fired boilers and water heaters that deliver reliable performance and durability for residential and commercial applications. Featuring advanced controls, durable construction, and an impressive warranty, this Dunkirk WPSB-3D Series II WPS307503210203 is the ideal choice for reliable and cost-effective home comfort. Don’t wait—upgrade your heating system today with this boiler and experience unmatched performance! Get yours only here at PlumbersStock!


Explore all your heating and cooling requirements at PlumbersStock.



** Due to this product's considerable weight and size our current shipping costs could fluctuate. Please call 435-868-4020 for today's shipping rates.

Product Features

  • High Efficiency: The Dunkirk WPSB-3D Series II WPS307503210203 offers an 84.0% AFUE rating, ensuring efficient fuel usage and reliable heating performance, which translates to cost savings and environmental benefits.
  • Optimal Heating Capacity: With 75 MBH (In) and 63 MBH (Out) sizes, this gas-fired hot water boiler provides the perfect heating capacity for most residential spaces, delivering comfort and warmth even in colder conditions.
  • Durable Construction: The boiler features a dependable cast iron heat exchanger with cast iron push nipples, designed to expand at the same rate when heated, ensuring a long-lasting and watertight seal for years of reliable operation.
  • Advanced Control System: This combines three essential functions in one unit such as temperature limiting with an LED display, a Low Water Cut-Off (LWCO) to protect from low water damage, and a boiler reset to save fuel by turning the burner on only when needed, offering energy savings and convenient operation.
  • Space-Saving Design: This atmospheric chimney vent boiler comes with an integral draft hood and vent damper, reducing the height and footprint for easier installation in spaces with limited clearance, making it a great choice for tighter locations.
  • Easy Installation: Featuring 1-1/4” return/supply water connections and a 1/2” NPT gas inlet, this boiler is simple to install and compatible with standard plumbing and gas fittings, helping to streamline the setup process.
  • Efficient Water Content: With 6.3 gallons of water content, the Dunkirk WPSB-3D provides ample thermal mass for efficient heating, ensuring consistent temperature regulation across the system.
  • Durable Finish: The boiler is equipped with a textured paint jacket, adding to its overall durability, protecting it from external elements, and extending its operational lifespan.
  • Reliable Warranty: The 20-year non-prorated limited warranty under the Cast to Last Warranty guarantees long-term protection and peace of mind, ensuring that the unit is built to last for many years to come.

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