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5 Liter Header / Expansion tank for Webasto and Espar

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Water Flow Tank from WFT - 5 liter capacity expansion / header tank 


5 liter / 1.32 gal header tank with pressure relief cap is an ideal solution for any water heating system, including Webasto Thermo and Espar / Eberspacher Hydronic water heating systems up to 12kW / 41K BTU.


Water flow tank is manufactured from highest grade plastic and can be used in Marine and RV applications in single or twin outlet systems. The WFT tank comes with one closed outlet, but can be drilled out if you require to run twin outlet system.  WFT header / expansion tank is designed to work with 19 mm ID (inner diameter) water / coolant / glycol hose. You can also use 22mm push fittings by cutting marked section of 19mm connection, which will ease your installation. Minimum (MIN) and Maximum (MAX) fill / level liens clearly indicated on the header tank 



Technical information:

  • Capacity - 5 liter
  • Measurements - 220mm x 250mm x 100mm (L x W x D)
  • Pressure relieve cap - 1.2 bar
  • Maximum temperature in the tank - 120°C / 248°F
  • Maximum pressure - 2.5 bar
  • Inlet / outlet connection ID - 19mm 
  • Inlet / outlet connection OD - 20mm
  • 1 or 2 outlet system available 
  • 12 Months warranty 



Suitable to replace / retrofit: 


  • 292100017741
  • 29.2100.01.7741 29.2100.01.77.41
  • 29 2100 01 7741 29 2100 01 77 41

2 Reviews Hide Reviews Show Reviews

  • 5
    good quality

    Posted by Maurice on 18th Jun 2021

    happy with the quality looks like the expensive plastic grade used

  • 5
    quality product!

    Posted by Teed Richard on 8th Jun 2021

    super quality! seems to be very high-grade plastic! very satisfied with this tank