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Eberspacher / Espar Hydronic HS3 Heat Exchanger Cover Seal / Gasket

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$22.99
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Core Features & Benefits

Espar / Eberspacher Hydronic HS3 Heat Exchanger Seal Kit

Genuine Espar / Eberspacher heat exchanger cover seal kit for Hydronic HS3 water heaters. This replacement gasket ensures a proper seal between the heat exchanger and cover assembly, preventing coolant leaks and maintaining correct heater performance.

Part Numbers

  • 252652990105
  • 25.2652.9901.05
  • 25.2652.99.01.05
  • 25 2652 9901 05
  • 25 2652 99 01 05

Fits the Following Heaters

  • Hydronic HS3 B4E
  • Hydronic HS3 D4E
  • Hydronic HS3 B5E
  • Hydronic HS3 D5E
  • Hydronic S3 CL (Diesel versions only)
  • Hydronic S3 CS (Diesel versions only)

Important Compatibility Information

IMPORTANT! his seal kit is not compatible with the following heaters:

  • B4E 20.1963.05
  • D4E 25.1994.05
  • D4E 25.2049.05
  • B5E 20.1952.05
  • D5E 25.1993.05
  • D5E 25.2048.05

If you have one of the above heaters, you will require an alternative seal kit part number 20.1952.99.0105.

Product Overview

The heat exchanger cover seal is critical for maintaining coolant integrity and ensuring efficient heat transfer within the Hydronic HS3 unit. Over time, seals can degrade due to thermal cycling and exposure to coolant, leading to leaks or reduced heater efficiency. Replacing the gasket during servicing helps maintain reliable heater operation.

Key Features

  • Genuine Eberspacher replacement part
  • Designed specifically for Hydronic HS3 water heaters
  • Ensures proper sealing of the heat exchanger cover
  • Prevents coolant leaks and performance issues
  • Direct-fit replacement

Specifications

  • Product Type: Heat Exchanger Cover Seal Kit
  • Heater Type: Hydronic (Water Heater)
  • Manufacturer: Eberspacher

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