Truma Boiler Seal Kit 34020-00933 | Combi / Ultrastore Gasket Set

Truma Boiler seal kit

The Truma Boiler Seal Kit (Part No. 34020-00933) is a genuine Truma service kit designed for Truma Combi and boiler water heater systems commonly installed in caravans, campervans and motorhomes. The kit contains a range of replacement gaskets, seals and O-rings used when servicing or repairing the heater unit.

These seals ensure that the heater housing and internal components remain properly sealed against water, air and combustion gases, helping maintain safe and efficient operation of the water heater. Over time, seals may wear, harden or become damaged due to heat and pressure, so replacing them during servicing helps restore the heater’s correct sealing performance.

This seal kit is typically used when carrying out maintenance, repairs or refurbishment of Truma Combi E heaters and similar boiler systems.

Why Choose This Spare Part

• Original Truma service kit – Part No. 34020-00933.

• Designed for Truma Combi and boiler water heater systems.

• Contains multiple seals, O-rings and gaskets required during servicing.

• Helps maintain proper sealing of heater components.

• Ideal for heater maintenance, repair or refurbishment.

Replacing worn seals helps prevent water leaks, air leaks and combustion issues within the heater system.

Key Features

• Service seal kit for Truma boiler and Combi heaters

• Includes gaskets, O-rings and sealing components

• Used during heater servicing or repairs

• Compatible with Truma Combi E heating systems

• Genuine Truma part number 34020-00933

Technical Specifications

Where and How to Fit This Product

The Truma Boiler Seal Kit (34020-00933) is used inside the Truma boiler or Combi heater assembly, replacing worn seals during servicing or repair.

Installation Overview

1. Disconnect the gas supply, power supply and water connections to the heater.

2. Remove the heater cover or service panel to access the internal components.

3. Locate the existing seals, O-rings and gaskets that require replacement.

4. Carefully remove the old seals and clean the mating surfaces.

5. Install the new seals from the kit in the correct positions.

6. Reassemble the heater components and secure all fittings.

7. Reconnect the gas, water and electrical systems and perform leak and function tests.

Because this work involves gas appliances and sealed heating components, installation should be carried out by a qualified caravan service technician or gas engineer.

What’s Included

The Truma Boiler Seal Kit (34020-00933) typically includes multiple sealing components used during heater servicing, such as:

• Lead-through brushes

• Sealing rings and gaskets

• Round cord seal set

• O-ring seals

• Cable brushes

• Profiled gasket and sealing bracket components 

Why Buy This Spare Part?

If your Truma boiler or Combi heater requires servicing, the Truma Boiler Seal Kit (34020-00933) provides the essential sealing components needed to restore the heater’s internal seals. Replacing worn gaskets during maintenance helps prevent leaks, improves heater efficiency and ensures the heating and hot water system continues to operate safely in your caravan or motorhome.