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Core Features & Benefits
Enjoy quick cabin comfort and reliable engine pre-heat with a compact 5 kW (17,000 BTU) gasoline water heater. The Espar Hydronic S3 B5E CS pairs with the EasyStart Pro controller for precise scheduling and effortless control.
The Hydronic S3 B5E circulates heated coolant to warm your engine and HVAC core, delivering rapid defrost, easier cold starts, and reduced engine wear. Its compact body fits tight engine bays; separate fuel metering and coolant pumps simplify flexible mounting.
Part numbers:
Browse Eberspächer/Espar Manuals & Technical Documentation
The optional accessory kit includes an intake silencer, exhaust silencer, and Z-shaped bracket with clamp — ideal for customers wanting a quieter, cleaner, and more professional heater installation. The silencers help reduce both intake and exhaust operating noise, improving comfort in enclosed spaces such as vehicles, cabins, or work equipment, while the bracket and clamp provide secure mounting, better routing, and added protection against vibration during operation.
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heatso had a good black Friday deal so we ordered this one as one of our friends recommended this heater for engine preheating. He got an earlier version from heatso about a year ago. We haven't installed ours yet, booked for next week. Ordered on Friday morning and received it Tuesday afternoon..
This was my first time installing one of these for a hydronic heated floor in my sprinter van conversion. There were A LOT of different parts, which looks intimidating, but it really wasn't that bad by the time I was done with everything.Customer service was great. I had a few questions that they answered effectively. That little bit of help really went a long way to clarify the installation process.For the unit itself - I've been using it for about one year and I did have a few days where it was throwing me an error, but that only happened about 5-10 times total which was only a temporary problem. I run this several times per day over the winter and it's been 99% operational. I love it so much and knowing what I know now I would never convert a van without a heated floor and heated blower combo using this unit. I'd probably tie it into my water source as well for hot water heater in the winter.Having a heated floor is an absolute game changer for vanlife. I'm completely satisfied and definitely recommend implementing this into your build.
