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OEM-Quality Aftermarket Cummins Block Heaters
Cold weather can make starting every engine a challenge, especially for powerful Cummins diesel engines. A Cummins block heater warms the coolant and engine block before startup — helping your truck, generator, or construction equipment start smoothly, burn fuel efficiently, and last longer.
Cummins Block Heater vs. Universal Block Heater
While a standard block heater may fit many engines, Cummins block heaters are engineered for exact cylinder head ports and coolant flow patterns found in Cummins 4B, 6B, ISB, and QSB series engines.
Tip: Always choose a Cummins‑specific model to ensure proper thread size, heating power, and seal integrity — universal types may not fit or heat evenly.
Popular Cummins Block Heater Options
| Product | Specification | Compatible Models | Features / Notes |
| Block Heater Cord 251919 (6B018) | Replacement Cord | 1989‑2023 Dodge Ram 5.9 L / 6.7 L Cummins, Ford 7.3‑6.7 L Powerstroke | Heavy‑duty cable; weather‑proof connector |
| Electric Engine Block Heater 3906389 | OEM‑type Heater | Cummins QSL9 Engines | Direct‑fit threaded design; optimized heating element |
| 120 V 750 W 3/4' NPT Block Heater Kit 3500022 | Kit (Heater + Cord + Seal) | Cummins 5.9 L & 6.7 L (2500–5500 Dodge Ram) | Ideal for winter starts; easy installation |
| 1500 W 240 V Pre‑Heater TPS152GT12‑000 | High‑Output Circulation Type | Cummins ISB, QSB Engines in Severe Climate | Maintains 120–140 °F coolant temperature |
| 1' Screw Block Heater & Cord 250647 / 3500069 | 120 V 1000 W | Dodge Ram 5.9 / 6.7 L Cummins 6B | Direct screw‑in; includes plug and seal |
| Block Heater 3975628 | 120 V 1000 W | Cummins 4B 3.9, 6B 5.9, ISB 6.7, QSB Series; Dodge Ram 2500 / 3500 | Genuine‑fit design; consistent heat distribution |
| Block Heater TPS202GT10‑000 (1800–2000 W) | Optional Upgrade | Cummins QSB / Industrial | For large engines or extreme cold starts |
How to Choose the Right Cummins Block Heater
Getting the correct heater ensures your engine warms evenly, starts instantly, and avoids unnecessary wear.
1. Identify by OEM Part Number
Look for stamped numbers on your old heater (e.g., 3500022, 3975628, 250647, 3906389) or check your service manual.→ Search the number directly on FridayParts.com for exact matches.
2. Check Engine Model & Size
- 4B & 6B Cummins: typically 3/4' NPT threads, 400–750 W
- ISB / QSB / QSL Series: usually 1' NPT or M22 x 1.5 threads, 1000–1500 W
- Generators & Heavy Equipment: may require 1800–2000 W Hotstart‑type heaters
3. Verify Voltage & Thread Type
Most truck and equipment models use 120 V heaters, while export or industrial units may need 240 V versions. Measure the port diameter or confirm from OEM specs.
4. Select Between Kit or Heater Only
- Kit: includes heater, cord, plug, and seal — ideal for fresh installation.
- Heater Only: for direct replacement when wiring already exists.
5. Consider the Climate
- Mild to cold: 400 – 750 W units work well.
- Below −20 °C (−4 °F): 1000 – 1500 W recommended.
- Extreme conditions or standby equipment: 1800 W+ pre‑heater ensures rapid warm‑up.
Shop Cummins Block Heaters at FridayParts
Explore genuine‑fit options for your Cummins Diesel:
- 3500022 – 120 V 750 W 3/4' NPT Block Heater Kit – Perfect for 5.9 L / 6.7 L Dodge Ram
- 3975628 – 1000 W Block Heater – Fits 4B3.9 / 6B5.9 / ISB6.7 Engines
- 3906389 – Electric Block Heater – For Cummins QSL9 Applications
- 3500069 – 1' Screw Heater & Cord Assembly – Reliable for 6B Series
- TPS152GT12‑000 – 1500 W 240 V Pre‑Heater – Heavy‑duty for industrial Cummins engines
Keep your Cummins engine warm, reliable, and ready for work — even on the coldest mornings.
Shop Cummins Block Heaters at FridayParts.com to enjoy OEM Quality · Low Price · Fast Global Delivery · 90‑Day Return · One‑Year Warranty!