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Espar / Eberspacher Hydronic B5E 12V Gasoline Petrol RV / Camper Kit for Water / Air / Floor Heating

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Upgraded version for Previous B5S Hydronic RV KIT is here! HYDRONIC HS3 B5E Petrol Gasoline HEATER RV KIT!

Hydronic S3 B5E from Espar has been improved for optimal performance and highest comfort standards:

  • Service life up to 3000 hours
  • New Pro controller
  • Residual Heat - uses all unused hot coolant while the engine is off
  • Stepless heating control system
  • Noise optimization

The Espar /  Eberspacher Hydronic Motorhome RV heater is typically mounted externally (engine bay), whilst the header tank, air blower and hot water heat exchangers mounted internally. Due to compact size of both plate exchanger and Kalori Evo1 blower. The blower units would be mounted in the area where the heat is most required i.e. living area and the rear (air ducting is option on custom kits). Kalori now comes with upgraded Controller- thermostat, which hallows you to control (dim) the temperature and fan speed.

22 plate water heat exchanger is included in the kit, with all the fittings already installed to have it mounted quickly. Ideal solution to meet your air heating and hot water demand in any vehicle powered in diesel. For Gasoline version, please contact support! 

With this system you can have floor heating as well. Just need to have two pipe system (closed loop). Radiant floor heating in your camper van or van conversion.  

Operation – Once activated, the Espar / Eberspacher B5E heater will use the vehicle’s own fuel in a combustion process to heat the coolant via a heat exchanger inside of the Hydronic Unit. The heated coolant is then circulated round the heating circuit passing through blower heaters by an integrated water pump. The Espar / Eberspacher unit is self regulating & operates in a similar way to a domestic central heating system.

Espar / Eberspacher B5E Hydronic 3 12V 5.2kW Gasoline water heating system kit includes:

• Espar Hydronic 3 B5E Heater 12V and EasyStart PRO controller
• Kalori Blower controller unit
• All electrical harnesses and connections
• 1 meter of exhaust pipe
• 1 meter of combustion Intake pipe 
• 2.3m of water hose (Heater) (20mm)
• 4m of water hose 16mm ID (Blower Box)
• 1 Exhaust Silencer (24mm)
• Circulating Water Pump (for glycol / coolant circulation in Hydronic system ) 
• Fuel Pump
• Fuel T Piece Kit 
• All necessary clips and screws
• Heater water (expansion) tank 5 Liter 
• Espar / Kalori Blower box 4.3kw with Grill - air blower unit water plate exchanger
• Hydronic Mounting Bracket

Part Numbers:

Espar Hydronic B5E CS 12V Gasoline  / Petrol water heater :

  • 202008050000
  • 20.2008.05.0000 / 20.2008.05.00 00
  • 20 2008 05 0000 / 20 2008 05 00 00


Installation, servicing and maintenance must be done in accordance with manufacturer’s guidelines. Failure to follow these guidelines will result in voiding your warranty. 

We provide free technical and installation support via email or phone to all of our customers who purchase a heater, heater kit or other products from Heatso. We take pride in our customer service and want to ensure that your heater system is properly installed. As a result, if you have any difficulties, please do not hesitate to contact us at [email protected].

If you require removing and/or refitting your item, please visit a local professional or authorised specialist, if you can not find one you can contact us and we will try to recommend a local partner to assist with the task. The cost of removing and/or refitting this item is not covered by the warranty.

Standard/Premium Warranty Terms for Espar/Eberspacher or Webasto Heaters & Heater kits

2 Years + optional 1 year extended Warranty available

If the item has failed within warrantable conditions:

  1. Please fill out the contact form on the “Contact us” page.
  2. A representative will contact you within 24 business hours to confirm the details and assist you further.
  3. If the product needs to be inspected by our service engineer, we will provide shipping labels for you to print and attach before handing over to our courier for collection.
  4. The shipping label will contain instructions for arranging pickup at your location or drop off at a nearby FedEx location. Follow these instructions to pass the package to FedEx.
    1. *The Label must be attached to the packages before leaving the package with FedEx.
    2. *You can also choose to drop off the item at a FedEx post office instead of requesting a courier collection.
    3. *If after inspection it appears that the item is not warrantable and the malfunction is caused by a non-warrantable condition, we will kindly ask you to cover shipping expenses at a discounted flat rate.
  5. On average, diagnostics of heaters and their parts takes 3 to 4 working days from the moment the item has reached our warehouse.
    1. *The diagnostics report is provided by a manufacturer approved authorised service centre.
  6. If during diagnostics it was concluded that the fault falls under non-warrantable conditions, our customer support will reach out to you and provide you with an estimated repair cost.
    1. *Please note that we strive to provide the lowest possible repair prices.
  7. Under normal circumstances it can take 3-7 working days after diagnostics to repair most minor malfunctions.
    1. *Please note that each case is unique and your repairs may take longer depending on the fault.


*Please note that all deadlines above are approximate and everything depends on the specific details of each case.

**If your item has been installed by a third party, please save all the documentation.This documentation can help find and fix the fault faster.

1 Review Hide Reviews Show Reviews

  • 5
    gas system!

    Posted by Chris Sa on 26th Aug 2020

    Thank you! finally a gas system. tired of diesel kits
    finally, a petrol rv kit. took a few days to install - works flawlesly