Gasoline water heater for faster warm-ups and clear windows
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.
Benefits & Use Cases
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.
- Pre-heat engine and cabin for comfort and longevity
- Fast defrost/de-ice to keep visibility clear
- Programmable comfort via EasyStart Pro timer controller
- Ideal for daily drivers, emergency fleets, vans, and motorhomes
- Can support domestic hot water loops in boats and RVs
Technical Specifications
- Fuel: Gasoline (petrol)
- Voltage: 12 V
- Heat output: 17,000 BTU (≈ 5.0 kW)
- Fuel consumption: 0.06–0.17 gal/h (0.23–0.67 L/h)
- Power draw: 7–32 W
- Max operating altitude: 10,000 ft (3,048 m)
- Warranty: 2 years
- Dimensions (heater body): 8.4 × 3.5 × 5.6 in (215 × 91 × 144 mm)
- Weight: 4.4 lb (2 kg)
- Part numbers (heater): 202008050000 / 202051050000 / 20.2008.05.0000 / 20.2051.05.0000
Vehicle Compatibility
- Passenger cars (from 2.0 L displacement)
- Emergency vehicles
- Vans, large taxis, minivans
- Commercial vehicles, incl. tandem setups with air heaters
- Construction and agricultural machinery
- Motorhomes; also suitable for boats (domestic hot water loops)
Kit Includes
- Hydronic B5E 12V heater with mounting bracket 2528205105000
- EasyStart Pro Timer controler
- Coolant pump with mopunting bracket
- Fuel metring pump with mounting accesories
- Wiring harness
- Coolant pump harness
- Water connection sockets (x2)
- Fuel Standpipe and fuel line
- Silencer / muffler with Z shape bracket
- Exhaust Hose - 900mm / 35.4 inch and 300mm / 11.8 inch with end cap
- Coolant hose
- Air intake silencer - 760 mm / 29.9 inch
- Mounting accesories - cable ties, clamps, screws, etc.
Manuals
Technical Specifications of the Espar Hydronic S3 B5E CS Gasoline 12V Water Heater kit with EasyStart Pro Controller
- Part Number:
- 202008050000 / 202051050000 / 2528205105000
- Fuel:
- Gasoline
- Voltage:
- 12V
- Max. Heat Output:
- 17,000 BTU (5 kW)
- Max. Altitude:
- 10,000 ft (3,048 m)
- Fuel Consumption:
- 0.06 - 0.17 gal/h (0.23 -0.67 l/h)
- Power Consumption:
- 7 - 32W
- Dimensions (L x W x H):
- 8.4 x 3.5 x 5.6 in (215 x 91 x 144 mm)
- Weight:
- 4.4 lb (2kg)
- Heater model:
- Hydronic S3
Included in the kit:
Gasoline water heater for faster warm-ups and clear windows
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.
Benefits & Use Cases
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.
- Pre-heat engine and cabin for comfort and longevity
- Fast defrost/de-ice to keep visibility clear
- Programmable comfort via EasyStart Pro timer controller
- Ideal for daily drivers, emergency fleets, vans, and motorhomes
- Can support domestic hot water loops in boats and RVs
Technical Specifications
- Fuel: Gasoline (petrol)
- Voltage: 12 V
- Heat output: 17,000 BTU (≈ 5.0 kW)
- Fuel consumption: 0.06–0.17 gal/h (0.23–0.67 L/h)
- Power draw: 7–32 W
- Max operating altitude: 10,000 ft (3,048 m)
- Warranty: 2 years
- Dimensions (heater body): 8.4 × 3.5 × 5.6 in (215 × 91 × 144 mm)
- Weight: 4.4 lb (2 kg)
- Part numbers (heater): 202008050000 / 202051050000 / 20.2008.05.0000 / 20.2051.05.0000
Vehicle Compatibility
- Passenger cars (from 2.0 L displacement)
- Emergency vehicles
- Vans, large taxis, minivans
- Commercial vehicles, incl. tandem setups with air heaters
- Construction and agricultural machinery
- Motorhomes; also suitable for boats (domestic hot water loops)
Kit Includes
- Hydronic B5E 12V heater with mounting bracket 2528205105000
- EasyStart Pro Timer controler
- Coolant pump with mopunting bracket
- Fuel metring pump with mounting accesories
- Wiring harness
- Coolant pump harness
- Water connection sockets (x2)
- Fuel Standpipe and fuel line
- Silencer / muffler with Z shape bracket
- Exhaust Hose - 900mm / 35.4 inch and 300mm / 11.8 inch with end cap
- Coolant hose
- Air intake silencer - 760 mm / 29.9 inch
- Mounting accesories - cable ties, clamps, screws, etc.
Manuals
Choosing Guide
Option Choosing Guide for this product is coming soon, please contact support@heatso.com if you need help picking the right options or have any questions.
Shipping
- United States - 1-5 Working Days
- United Kingdom - 2-5 Working Days
- European Union - 2-7 Working Days
- Australia / New Zealand - 5-14 Working Days
- Rest of World - 5-14 Working Days
There may be a delay if the order is shipped to a PO or parcel shop address. Please note, some couriers do not offer shipping to PO boxes.
View full shipping & Delivery information
Returns
You can return or exchange goods within 14 days from the date of purchase if the item is unused and brand new in unopened packaging. You must contact us before returning any goods, though. Additional deductions might be applied as indicated in the Returns section of our Terms and Conditions.
Warranty Information
Most heaters come with 2 year warranty + optional 1 year extended Warranty available
- Parts - 1 Year Warranty
- Refrigerators - 2 Year Warranty
- AC Systems - 1 Year Warranty
- Heavy duty heating equipment (10 kW+) - 1 Year Warranty
- Other items - 1 Year Warranty
Installation, servicing and maintenance must be done in accordance with manufacturers 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.
If you require removing and/or refitting your item, please visit a local professional or authorized 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.
Customer reviews
Write a Review
Espar Hydronic S3 B5E CS Gasoline 12V Water Heater kit with EasyStart Pro Controller
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all good, fast shipping
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..
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One year of Vanlife and still working fine
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.