Hydronic Engine Preheater for Faster Cold Starts & Cabin Comfort
Warm your engine and cabin efficiently with this compact Espar hydronic heater. The Hydronic 2 D5S delivers steady 17,000 BTU (5 kW) diesel heating and pairs with the EasyStart Timer for precise schedules and diagnostics - perfect for winter reliability and off-grid use. This second-generation heater still works with a high altitude kit, to increase capabilities to operate in higher altitudes, where other models might be struggling to operate
Benefits & Use Cases - Eberspacher Coolant Heater
Cut idling, reduce engine wear, and enjoy quiet hydronic warmth. Ideal as an Eberspacher engine heater for cold-start protection in passenger vehicles and commercial fleets, and as a compact boiler for RV water/air heat exchangers.
- Engine-off preheating for faster starts and lower emissions.
- Stable coolant loop heat for fan-coil or heat-exchanger cabin heating.
- EasyStart controller adds timer programs and service prompts.
- Efficient diesel operation for long runtime with minimal fuel use.
Vehicle Compatibility
- Cab and engine heater
- Passenger cars (from 2.0 L displacement)
- Emergency vehicles
- Vans, large taxis, minivans
- Commercial vehicles (incl. tandem configs with air heaters)
- Construction & agricultural machines
- Motor yachts up to ~25 ft
- Motor homes
Technical Specifications
- Part Number: 252620050000 / 25.2620.05.0000 /25.2620.05.00.00 25 2620 05 0000 /25 2620 05 00 00
- Fuel: Diesel
- Voltage: 12V
- Max. Heat Output: 17,750 BTU (5.2 kW)
- El. power consumption: 12 - 40W
- Fuel consumption: 0.06 - 0.16 gal/h (0.26 - 0.64 l/h)
- Dimentions (L x W x H): 8.4 x 3.3 x5.4 in (214 x 86 x 139 mm)
- Weight: 5.2 lbs (2.4 kg)
- Heater model: Hydronic II
- Max. Altitude: 5,000 ft (1,500 m)
Included in the Kit
- Hydronic 2 D5S 12V heater with mounting bracket
- EasyStart Timer controller
- Coolant pump with mounting bracket
- Fuel metering pump with mounting accessories
- Wiring harness
- Coolant pump harness
- Water connection sockets (x2)
- Fuel Standpipe and fuel line
- Silencer / muffler with Z shape bracket
- Exhaust Hose
- Coolant hose
- Air intake silencer
- Mounting accessories - cable ties, clamps, screws, etc.
Technical Specifications of the Espar Hydronic II D5S Diesel 12V OES Heater with installation kit and Timer
- Part Number:
- 252620050000 / 25.2620.05.0000 /25.2620.05.00.00 25 2620 05 0000 /25 2620 05 00 00
- Fuel:
- Diesel
- Voltage:
- 12V
- Max. Heat Output:
- 17,750 BTU (5.2 kW)
- El. power consumption:
- 12 - 40W
- Fuel consumption:
- 0.06 - 0.16 gal/h (0.26 - 0.64 l/h)
- Dimentions (L x W x H):
- 8.4 x 3.3 x5.4 in (214 x 86 x 139 mm)
- Weight:
- 5.2 lbs (2.4 kg)
- Heater model:
- Hydronic II
- Max. Altitude:
- 5,000 ft (1,500 m)
Included in the kit:
Hydronic Engine Preheater for Faster Cold Starts & Cabin Comfort
Warm your engine and cabin efficiently with this compact Espar hydronic heater. The Hydronic 2 D5S delivers steady 17,000 BTU (5 kW) diesel heating and pairs with the EasyStart Timer for precise schedules and diagnostics - perfect for winter reliability and off-grid use. This second-generation heater still works with a high altitude kit, to increase capabilities to operate in higher altitudes, where other models might be struggling to operate
Benefits & Use Cases - Eberspacher Coolant Heater
Cut idling, reduce engine wear, and enjoy quiet hydronic warmth. Ideal as an Eberspacher engine heater for cold-start protection in passenger vehicles and commercial fleets, and as a compact boiler for RV water/air heat exchangers.
- Engine-off preheating for faster starts and lower emissions.
- Stable coolant loop heat for fan-coil or heat-exchanger cabin heating.
- EasyStart controller adds timer programs and service prompts.
- Efficient diesel operation for long runtime with minimal fuel use.
Vehicle Compatibility
- Cab and engine heater
- Passenger cars (from 2.0 L displacement)
- Emergency vehicles
- Vans, large taxis, minivans
- Commercial vehicles (incl. tandem configs with air heaters)
- Construction & agricultural machines
- Motor yachts up to ~25 ft
- Motor homes
Technical Specifications
- Part Number: 252620050000 / 25.2620.05.0000 /25.2620.05.00.00 25 2620 05 0000 /25 2620 05 00 00
- Fuel: Diesel
- Voltage: 12V
- Max. Heat Output: 17,750 BTU (5.2 kW)
- El. power consumption: 12 - 40W
- Fuel consumption: 0.06 - 0.16 gal/h (0.26 - 0.64 l/h)
- Dimentions (L x W x H): 8.4 x 3.3 x5.4 in (214 x 86 x 139 mm)
- Weight: 5.2 lbs (2.4 kg)
- Heater model: Hydronic II
- Max. Altitude: 5,000 ft (1,500 m)
Included in the Kit
- Hydronic 2 D5S 12V heater with mounting bracket
- EasyStart Timer controller
- Coolant pump with mounting bracket
- Fuel metering pump with mounting accessories
- Wiring harness
- Coolant pump harness
- Water connection sockets (x2)
- Fuel Standpipe and fuel line
- Silencer / muffler with Z shape bracket
- Exhaust Hose
- Coolant hose
- Air intake silencer
- Mounting accessories - cable ties, clamps, screws, etc.
Choosing Guide
Option Choosing Guide for this product is coming soon, please contact [email protected] 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 II D5S Diesel 12V OES Heater with installation kit and Timer
-
Worth it
A great little runner with blower unit. Got independent air heating with Kalori Kuba and water plates. Using my own plates. 24 plate exchanger works like a treat. No more army showers!
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Heater
Great it just what I needed
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Need heat
It was good fast delivery fit perfectly they were very helpfull
-
Heater
Great it just what I needed
-
Worth it
A great little runner with blower unit. Got independent air heating with Kalori Kuba and water plates. Using my own plates. 24 plate exchanger works like a treat. No more army showers!