Primary heat exchanger Sermeta GM30-45-365-03 (thermal cell) — Ref. GM30-45-365-03
Thermal cell/primary heat exchanger Sermeta GM30-45-365-03 for condensing boilers that come with it as standard. It transfers heat from the burner to the primary circuit and condenses the flue gases to recover energy. It is essential to check the part's PCB and the cross-reference in the official breakdown of your boiler before purchasing.
- Type of part
- Combustion chambers
- Status
- Refurbished
- Catalogue reference
- GM30-45-365-03
- Warranty
- 1 year
How to check if the reference GM30-45-365-03 is the part for your boiler.
The part reference, model, and equipment revision must be verified against the manufacturer's documentation.
Symptoms that require diagnosis in the GM30-45-365-03 combustion chambers
Common symptoms and faults
- 01
Water loss through the chamber/coil or presence of water in the condensate collector with the unit stopped.
Cause: Crack or perforation of the coil/condensate collection
Visual inspection and hydraulic tightness test of the primary; look for signs of corrosion or cracks in welds.
- 02
Overtemperature lockouts or trips due to lack of flow
Cause: Internal obstruction due to deposits or sludge in the primary circuit
Check for abnormal ΔT between supply/return and flow rate; consider controlled chemical cleaning if permitted by the manufacturer.
- 03
Smell of smoke or traces of condensate in the burner area
Cause: Leak in the flue gas casing or at the joint of the heat exchanger flange
Tightness test of the combustion chamber and verification of the seating/condition of the gasket.
- 04
Low efficiency and high consumption
Cause: Dirty heat transfer surface or without effective condensation
Check the cleanliness of the fins/channels and the proper return of condensate; verify adjustment and combustion.
These symptoms can have more than one cause. If your boiler displays a fault code, send it to us via WhatsApp along with a photo of the labeling, and we'll tell you if this is the part.
Technical sheet: Sermeta GM30-45-365-03
- Catalogue reference
- GM30-45-365-03
- Uniclima internal SKU
- CAMCHX
- Brand
- Sermeta
- Type of part
- Combustion chambers
- Units in stock
- 3 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
Part data and available documentation
Contrast the label codes, PCB, and revision with the installed part; they are not necessarily equivalent references.
- component manufacturer
- Sermeta
- component model
- GM30-45-365-03
- thermal family
- GM30-45
- type
- condensing primary heat exchanger (thermal cell)
- material
- Stainless steel for condensing boilers
- state
- Refurbished (used, verified)
- codes on label (not confirmed as OEM P/N)
- 0020260508; 902108; 452287; 608133T8
- secure identification
- By Part n° stamped on the plate: GM30-45-365-03
- Cut off gas and electrical supply before intervening.
- Wait for complete cooling and bleed the circuit when disassembling.
- Use new gaskets and specified screws; do not reuse deformed gaskets.
- Apply the torque value according to the manufacturer's manual for the boiler.
- Perform hydraulic tightness tests and combustion chamber tests after installation.
- Check and adjust the combustion with an analyzer; record values.
- Bleed the circuit and check circulation/ΔT before starting up.
- If the boiler requires it, reparameterize the service and reset the maintenance counters.
Frequently asked questions about the GM30-45-365-03 combustion chambers.
Is it suitable for my boiler?
Is it the same as the domestic hot water heat exchanger?
What else should I change besides the heat exchanger?
Can I clean the old one instead of replacing it?
