Combi boiler spare parts: circulation pump, 3-way valve, plate heat exchanger, expansion vessel, gas valve, NTC sensor and safety relief valve. Yedepa stocks original and compatible boiler parts for Vaillant, ECA, Demirdöküm, Baymak and Bosch combi boilers; the compatible boiler models are listed on every product page.
Combi Boiler Spare Parts by Part Group
- Circulation pump: Boiler-type pumps, primarily Wilo and Grundfos, are listed by power (W) and connection size in the circulation pumps group.
- 3-way valve: If only the motor is to be replaced, see 3-way valve motors; if it is to be replaced together with its body, see 3-way valve assemblies; cartridge, seal and shaft sets are under repair kits.
- Plate heat exchanger: Plate heat exchangers selected by the number of plates and screw spacing; scaling of the heat exchanger on the hot water side is the most common reason for replacement.
- Expansion vessel: Boiler expansion vessels by litre capacity and connection size (3/8", 1/2").
- Gas valve: Honeywell and boiler-brand-specific gas valves.
- NTC sensor: Immersion and clip-on (surface) type NTC sensors.
- Ignition and ionisation electrodes: Single, double and ionisation-type ignition electrodes (spark plugs).
- Flue fan: Fime-motor and brand-compatible boiler flue fans.
- Turbine and pressure sensor: Turbines (flow sensors) that read the hot water flow, and water pressure sensors and switches are in this group; the air pressure switches (air pressostat, pressure switch) that monitor the flue draught are listed separately.
- Safety and filling: 3 bar safety relief valves, filling loop taps and pressure gauges.
- Consumables and condensate: gaskets, O-rings and diaphragms, and the siphon and drain parts of condensing boilers under condensate system parts.
Compatible Boiler Parts by Brand
- Vaillant: Gas valves, heat exchangers, pumps and sensors for the Ecotec, Turbotec and Atmotec series; for example the Vaillant Ecotec Pro 24/25/28 and Turbotec gas valve.
- ECA: The ECA 3-way valve repair kit for the Proteus, Confeo and Calora series, and the 3-way valve stepper motor used in ECA, Demirdöküm, Vaillant, Viessmann, Ferroli and Ariston boilers.
- Demirdöküm: The Zilmet 7 litre expansion vessel (3/8" connection) and the Aden immersion NTC sensor for the Neva, Atron and Aden series.
- Ariston, Bosch, Buderus and Ferroli: The 8 litre 3/8" expansion vessel and the Bosch, Buderus and Viessmann 14-plate heat exchanger.
- Baymak: The ignition electrode (compatible with ECA Premix Proteus, Baymak Novadens Extra, Ariston) and the 220 V 70 N 3-way valve stepper motor for the Novadens and Eco series.
- Viessmann: The Vitopend 100 12-plate heat exchanger for the Vitopend series.
Values to Check When Choosing the Right Part
- Boiler model and series: Parts differ between series within the same brand; compare the full model name on the rating plate with the compatible model list on the product page.
- Connection size: The 3/8" versus 1/2" distinction for expansion vessels, filling loop taps and safety relief valves; the number of plates and screw spacing (mm) for heat exchangers.
- Electrical ratings: Voltage (V) and power (W) for pumps and flue fans; torque (N) and connector type for 3-way valve motors; resistance value and mounting type for NTC sensors.
- Capacity: Litre capacity and pre-charge pressure for expansion vessels; the number of plates corresponding to the kW output for heat exchangers.
Fault Symptoms and Replacement Guides
If the boiler heats but gives no hot water, the 3-way valve; if the pressure keeps dropping, the expansion vessel or safety relief valve; if there is noise and fluctuating heating, the circulation pump are the first parts to check. To distinguish the symptoms and for step-by-step replacement, you can read our 3-way valve, expansion vessel, safety relief valve and circulation pump guides. We keep the parts that technicians and technical service companies replace frequently during the winter season together in the catalogue, and make it easy to match the right part for bulk requirements using the compatibility information on the product pages.
-250x250.jpg "Bosch - Buderus Combi Boiler Pressure Gauge (28 mm Diameter)")
Brand: OEM
Model: AI0214B
The Bosch - Buderus Combi Boiler Pressure Gauge is designed to let you accurately monitor your combi boiler's internal pressure. Compatible with Bosch and Buderus combi boilers, this gauge clearly displays the pressure level and ensures your system operates safely.
Product Features
Compatib..
$4.95
Ex Tax:$4.12
-250x250.jpg "Bitron Combi Boiler Flow Turbine with Filter – Bosch Compatible, White Plastic")
Brand: Bitron
Model: 20491552
The combi boiler flow turbine is an important sensor part that controls the boiler's hot water production by detecting the amount of water passing through the domestic hot water line. Thanks to its filtered design, it provides additional protection against foreign particles that may come from the in..
$9.82
Ex Tax:$8.19
Brand: Scopo
Model: AI0105
Product Features
Material: Grade A plastic and brass raw material
Origin: Turkey
Compatibility: Compatible in particular with Ariston Clas X and Cares X model combi boilers
Use: Allows easy adjustment of the water pressure with a simple operation
Installation: Can be done easily follow..
$2.37
Ex Tax:$1.97
new
Brand: BDR
Model: 120.003.010
The BDR Control 120.003.010 air pressure switch is the safety part that monitors flue draft in Immergas room-sealed boilers. It does not close its contact until the fan is running and has created sufficient vacuum in the flue line; the board does not ignite the burner without this confirmation. In o..
$3.99
Ex Tax:$3.33
-250x250.jpg "Can Conta Baymak Baxi Combi Boiler Expansion Vessel 6 Liter M14")
Brand: OEM
Model: CAN09
Designed for Baymak and Baxi combi boilers, this 6-liter expansion vessel balances pressure changes in the boiler installation and ensures safe, stable system operation. Manufactured by Can Conta, this product is a reliable choice for maintenance and repair work thanks to its sturdy body and long se..
$27.58
Ex Tax:$22.98
-250x250.jpg "Novasfer G1/4\" Drain Cock – Compatible with Baymak, E.C.A., Baxi (Water Discharge Valve)")
Brand: Novasfer
Model: NVM08
Product Description
The Novasfer G1/4" drain cock is a high-quality fitting used for controlled draining of water in combi boilers and heating systems.
Its durable brass body and blue protective cap ensure long-lasting and safe use.
It is fully compatible with Baymak, E.C.A. and Baxi combi bo..
$3.11
Ex Tax:$2.59
-250x250.jpg "Zilmet 539 OEM-PRO 8 Liter M14 Rectangular Combi Boiler Expansion Vessel – Baymak Novadens, Baxi, Westen Compatible")
Brand: Zilmet
Model: ZLM106
This is the Zilmet equivalent of the 8-liter rectangular expansion vessel with M14 connection used in Baymak Novadens, Baxi, Westen, Chappee, Lambert and Falke combi boilers. Part of the Italian brand Zilmet’s OEM-PRO series with drawing number 539, this vessel absorbs the expansion of heated system..
$27.74
Ex Tax:$23.12
-250x250.jpg "MEC Combi Boiler 3 Bar Safety Relief Valve - Compatible with Ferroli, Bosch, Ideal Logic, Quick Connection Design")
Brand: MEC
Model: 77890026041
A Reliable Safety Solution for Combi Boiler Systems
The MEC Combi Boiler 3 Bar Safety Relief Valve protects against overpressure by balancing water pressure in combi boiler and heating systems. It is compatible with many combi boiler models, including
Ferroli, Bosch, Ideal Logic and mor..
$2.49
Ex Tax:$2.08
Brand: Önaysan
Model: 7181521511
Manufactured in Turkey by Önaysan, the Aden Printed Combi Boiler Expansion Vessel is produced to high quality standards. With a capacity of 7 liters, this expansion vessel is used to balance the pressure changes that may occur in combi boiler systems due to temperature changes.
Product Features
..
$26.66
Ex Tax:$22.22
Brand: Erta
Model: KB.20810
Features
Compatible Brand: Eca
Model: Confeo Premix
Type: Ionization Ignition Electrode
Product Description
Specially designed for Eca Confeo Premix combi boilers, this Ionization Ignition Electrode starts combustion by generating a spark during the..
$6.59
Ex Tax:$5.49
Brand: Scopo
Model: AI0063
Product Features
Material: High-quality metal and plastic
Country of Manufacture: Turkey
Compatible Models: Suitable for all Eca Proteus combi boiler models whose part looks identical.
Warranty: 2 Years
Product Description
Specially designe..
$1.23
Ex Tax:$1.02
Brand: OEM
Model: BD1009
Features
LCD display
Simple design
Two button cells for long operating time
Especially suitable for use in refrigerators, coolers, freezers, etc.
Technical Parameters
Temperature range: -50°C~+70°C
Operating environment: Temperature: -5°C~+50°C, Humidity: 5%~80%
Accuracy: ..
$1.94
Ex Tax:$1.62
-250x250.jpg "Combi Boiler Filling Valve (Red Long Type) – Baxi, Protherm, Baymak Compatible – JJJ000620890")
Brand: Generous
Model: 77890022037
Product Description
The combi boiler filling valve (red long type) is an important fitting that allows water to be added to the combi boiler's system. Fully compatible with Baxi, Protherm and Baymak combi boilers, this valve is the model with code JJJ000620890. Its brass body and durable red handle..
$1.86
Ex Tax:$1.55
Brand: I.T.M
Model: RST19
Demirdöküm Kalisto and Nitron combi boiler 3-way valve repair kit: a set that renews the worn, hardened or leaking parts of the three-way valve assembly (body caps, ball-shaft, seals and screws). This set is fitted for complaints such as the radiators also heating up when only hot water is being use..
$4.30
Ex Tax:$3.58
-250x250.jpg "Demirdöküm Aden Combi Boiler Water Flow Turbine Sensor - Pin Socket (Old Type)")
Brand: K&N Control
Model: AI0254
The pin-socket water flow turbine sensor (old type), made specifically for Demirdöküm Aden combi boiler models, is designed to monitor the water flow of the combi boiler and ensure that it operates correctly. This turbine sensor transmits the water flow rate to the combi boiler, optimizing the appli..
$2.02
Ex Tax:$1.68
-250x250.jpg "Chunhui WV20M55 320100164 Combi Boiler 3-Way Valve Stepper Motor 7.5mm (ECA, Baymak, Biasi Compatible)")
Brand: Chunhui
Model: CVM03
A high-performance 3-way valve stepper motor, one of the parts most frequently used by service companies for faults in the diverter that switches between central heating and domestic hot water in combi boilers. Fully compatible with ECA, Baymak and Biasi Compact series combi boilers, this spare part..
$6.37
Ex Tax:$5.31
-250x250.jpg "Airfel, Demirdöküm, Baymak O-Ring-Free Combi Boiler NTC Sensor")
Brand: Scopo
Model: 6109
Product Features
This high-quality NTC sensor fits Airfel, Demirdöküm, Baymak and Beretta combi boilers perfectly and offers easy installation. With a design that requires no gasket or O-ring, it precisely measures the temperature of the water circuit.
Technical Details
Brand Compatibility: A..
$0.99
Ex Tax:$0.83
-250x250.jpg "Zilmet 17B1901206 Combi Boiler Plate Heat Exchanger 12 Plates - ECA, Bosch, Viessmann Compatible")
Brand: Zilmet
Model: ZLMT27
Zilmet 12-Plate Heat Exchanger is designed for fast, efficient heating of water in combi boiler systems. It is compatible with various combi boiler models such as ECA, Bosch, Viessmann, Alarko Serena and Thermital. Offering high performance and durability, this heat exchanger is made in Italy and st..
$25.24
Ex Tax:$21.04