Espar Hydronic 5 S3-5KW Coolant Heater - Boxed

Espar Hydronic 5 S3 — Professional-Grade Coolant Heater

The Hydronic 5 S3 is Espar/Eberspaecher's latest-generation 5 kW coolant heater, engineered for reliable cold-weather starts and cab comfort in demanding work environments. Whether you're idling in sub-zero temperatures or prepping a fleet truck for an early morning run, the S3 delivers consistent, fuel-efficient heat before you even turn the key.

Key Features

• 5 kW output — suitable for engines up to 15L displacement
• Includes EasyStart Pro Timer — schedule pre-heating remotely for a warm cab and engine on arrival
• Boxed unit — complete heater assembly ready for professional installation
• Designed for heavy-duty trucks and commercial vehicles

Installation Note

A fuel pickup tube is required and sold separately. Compatible part numbers:

• PN 20.2900.20.2010
• PN 20.2900.20.2004

Why the Hydronic 5 S3?

Espar's S3 platform represents the latest evolution in diesel coolant heating — quieter, more efficient, and built to perform in the harshest North American winters. Stop idling. Start smarter.