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  1. Home
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  5. Dunkirk WPSB-6D Series II Boiler w/ Draft Diverter w/ Grundfos Pump, Natural Gas, 187.5 MBH In, 157 MBH Out, 7" Flue - WPS618703220203

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Dunkirk WPS618703220303 Dunkirk WPSB-6D Series II Boiler w/ Draft Diverter w/ Grundfos Pump, Natural Gas, 187.5 MBH In, 157 MBH Out, 7
View 2 of Dunkirk WPS618703220303 Dunkirk WPSB-6D Series II Boiler w/ Draft Diverter w/ Grundfos Pump, Natural Gas, 187.5 MBH In, 157 MBH Out, 7
View 3 of Dunkirk WPS618703220303 Dunkirk WPSB-6D Series II Boiler w/ Draft Diverter w/ Grundfos Pump, Natural Gas, 187.5 MBH In, 157 MBH Out, 7
View 4 of Dunkirk WPS618703220303 Dunkirk WPSB-6D Series II Boiler w/ Draft Diverter w/ Grundfos Pump, Natural Gas, 187.5 MBH In, 157 MBH Out, 7
View 5 of Dunkirk WPS618703220303 Dunkirk WPSB-6D Series II Boiler w/ Draft Diverter w/ Grundfos Pump, Natural Gas, 187.5 MBH In, 157 MBH Out, 7

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Dunkirk WPSB-6D Series II Boiler w/ Draft Diverter w/ Grundfos Pump, Natural Gas, 187.5 MBH In, 157 MBH Out, 7" Flue - WPS618703220203

SKU: 389178
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Product Details

Manufacturer: Dunkirk
Product: Boiler
Color: Blue
Modus Operandi: Natural Gas
Other Info: Grundfus Pump Included
Connection Type: NPT
Capacity: 11.7 Gallons
Electrical Voltage: 120 Volt
Width: 21"
Height: 36-3/8"
Depth: 26-1/2"
Water Connection: 1-1/4" NPT
Mount Type: Floor Mount
Material: Cast iron
Amperage: 15 amps
Connection Size: 1/2"
BTU Rate: 187,000 BTU
Mpn # WPS618703220303
Weight 315.00 lbs.

About the Dunkirk WPS618703220303

About the Dunkirk WPSB-6D Series II Boiler w/ Draft Diverter w/ Grundfos Pump, Natural Gas, 187.5 MBH In, 157 MBH Out, 7" Flue - WPS618703220203

Ensure consistent and efficient heating with this boiler!


The Dunkirk WPS618703220203 gas fired hot water boiler from the WPSB-6D Series II is an efficient and reliable choice for home heating, offering an 84.1% AFUE rating for optimal fuel usage. With a size of 187.5 MBH in and 157 MBH out, this 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 11.7 gallons of water content contribute to efficient heating performance. This model includes a Grundfos pump.


With a sleek, textured paint jacket for added durability, this Dunkirk WPSB-6D Series II WPS618703220203 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-6D Series II WPS618703220203 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

  • WPS618703220203
  • Input of 187.5
  • Heating Capacity 157
  • AHRI of 137
  • AFUE % Rating of 84.1
  • Flue Diameter 7"
  • LED Display
  • Low Water Cut Off

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