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.
Brand: Pakkens
Model: AI0166
Product Features
Compatible Models: Demirdöküm Nitromix combi boiler series
Product Type: Block Filter
Function: Purifies the water entering the combi boiler and traps particles that could harm the boiler
Construction: Made of high-quality material and durab..
$3.06
Ex Tax:$2.55
Brand: Önaysan
Model: ONA17
Manufactured by Önaysan, this expansion vessel is specially designed to be compatible with Bosch Class and Buderus Logamax U072 combi boiler models. With its 12-liter capacity, it is ideal for medium-scale applications such as homes and workplaces.
Product Features
Model: Bosch Class - Bude..
$54.37
Ex Tax:$45.31
-250x250.jpg "Circulation Pump Air Vent Repair Kit - Wilo, Grundfos Compatible")
Brand: Scopo
Model: 77890038005
Product Description
This air vent repair kit is specially designed for Wilo and Grundfos circulation pumps. Thanks to its plastic body it offers durable, long-lasting use. By venting the air inside the pump it helps the system run more efficiently.
Key Features
Compatibility: Wilo and Grund..
$4.12
Ex Tax:$3.43
-250x250.jpg "Huba Combi Boiler Air Pressure Switch 40/25 Pa")
Brand: Huba Control AG
Model: HC002
Used to ensure safety in combi boiler and heating systems, this Huba brand air pressure switch is designed to detect a specific pressure range and, when the pressure goes outside this range, to stop or start the combi boiler or heating system for safety purposes.
Product Features
Model: 60..
$7.92
Ex Tax:$6.60
-250x250.jpg "Combi Boiler Flue Fan Motor VGR0020991 - Viessmann Vitopend 100 Compatible")
Brand: Fime
Model: FIM41
Product Description
Fully compatible with Viessmann Vitopend 100 combi boiler models, the VGR0020991 flue fan motor is specially designed to ensure efficient operation of your combi boiler. Made by FIME in Poland, this motor offers high performance and durability. With..
$43.05
Ex Tax:$35.87
-250x250.jpg "Combi Boiler Plate Heat Exchanger - 207mm, 1/2-3/4 Male Fittings, 14 Plates - Compatible with Alarko, Ferroli")
Brand: I.T.M
Model: PHE187
Product Features
This combi boiler plate heat exchanger is designed to be compatible with Alarko and Ferroli combi boilers. Its compact 207 mm long body with 1/2 and 3/4 male fitting connections allows easy installation. Thanks to its 14-plate design, it offers high heat transfer and efficiency..
$42.23
Ex Tax:$35.19
-250x250.jpg "Ariston 65104317 Combi Boiler Water Flow Turbine - Genus, Clas, Egis Compatible")
Brand: Bitron
Model: 4818
Precision Sensor Measuring Water Flow Rate
Ariston combi boiler water flow turbine (65104317) detects the water flow and automatically adjusts the combi boiler power settings.
By detecting changes in water flow rate and transmitting them to the control board, it ensures the s..
$8.58
Ex Tax:$7.15
Brand: Scopo
Model: AI0103
Compatible Models
Nike / Eolo Star 23
Nike / Eolo Star 23 kW
Immergas - 1.021831
Product Description
The Baymak - Auer Combi Boiler Filling Valve is a product of high quality and durability. It is compatible in particular with Nike / Eolo Star 23 and ..
$1.86
Ex Tax:$1.55
Brand: I.T.M
Model: AI0320
Features
Brand
Suitable brands: Warmhaus and Daikin.
In the field it is also known as a filling tap or filling valve.
Application
Used for filling operations in combi boiler systems.
Material
Made of brass.
Type
Manual filling tap.
Function
Used to ..
$3.22
Ex Tax:$2.68
-250x250.jpg "Viessmann Vitodens 100 Combi Boiler Ionization Spark Ignition Electrode")
Brand: I.T.M
Model: BJ59
The Viessmann Vitodens 100 Combi Boiler Ionization Spark Ignition Electrode is a high-quality spare part specially designed for Viessmann Vitodens 100 series combi boilers. This electrode generates the spark required to start combustion, ensuring safe and efficient operation of your boiler.
Produ..
$20.49
Ex Tax:$17.08
-250x250.jpg "Scopo AI0244 Combi Boiler Safety Relief Valve Internal Repair Kit (Turkish-Made)")
best seller
Brand: Scopo
Model: AI0244
The Combi Boiler Safety Relief Valve Internal Repair Kit is the renewal (internal) kit for the safety relief valve that protects the system by discharging overpressure in the water circuit of the combi boiler. Scopo brand (model AI0244), this domestically manufactured part made in Turkey is fully co..
$0.83
Ex Tax:$0.69
-250x250.jpg "NMB 24V DC Combi Boiler 3-Way Valve Motor (Diverter Valve Motor) | Compatible with Viessmann, Bosch, Buderus, Junkers, Worcester")
Brand: OEM
Model: NMB01
Product Description
The NMB 24V DC 3-Way Valve Motor is a high-quality motorized actuator that controls the flow direction between the domestic hot water and heating circuits in combi boilers.
This model stands out with its durable construction, quiet operation and long-lasting NMB-MAT motor tec..
$39.34
Ex Tax:$32.78
Brand: Scopo
Model: AI0432
Combi Boiler Water Flow Cartridge and Repair Kit
The combi boiler repair kit compatible with Baymak Eco 5 and Luna 5 models is developed to ensure efficient operation of the water flow system. Thanks to the cartridge, spring, gasket and fittings it contains, it regulates the hot water flow of your ..
$4.96
Ex Tax:$4.13
-250x250h.jpg "Eca 3 Bar Combi Boiler Safety Relief Valve Push-Fit 1/2")
Brand: Scopo
Model: 990001038
Designed specifically for Baymak and Eca brand combi boilers, safety relief valve with 3 bar pressure rating. Provides safety in the event of overpressure.
Product Features
Brands: Baymak, Eca
Valve Type: Safety Relief Valve
Pressure Rating: 3 Bar
Material: High-quality brass
Connec..
$4.61
Ex Tax:$3.84
Brand: Anstoss
Model: AR04
Features
Brand: Autoss - Manufactured with the assurance of an industry-leading brand.
Model: ZAG 2 V - An ideal solution for combi boiler applications requiring precise ignition.
Product Code: 07000063 - Reference code for easy and accurate ordering.
Voltag..
$12.52
Ex Tax:$10.43
-250x250.jpg "Ma-Ter XP600 Brass 1/4 Threaded Combi Boiler Pressure Sensor - 3 Pin")
Brand: Ma-Ter
Model: MT01
Precise Pressure Measurement for Combi Boilers and Heating Systems
Ma-Ter XP600 brass combi boiler pressure sensor is designed to measure pressure levels precisely in combi boilers and other heating systems, with its 1/4 inch threaded connection and 3-pin construction. Manufactured in Europe to h..
$4.74
Ex Tax:$3.95
-250x250.jpg "Zilmet 8 Lt Combi Boiler Expansion Vessel - 3/8 Connection - Turbotec, Ecotec Compatible")
Brand: Zilmet
Model: ZLM06
Zilmet 8 lt expansion vessel is a high-quality expansion vessel designed to balance water pressure in combi boiler systems and to provide safety against temperature changes. It is compatible in particular with Vaillant Turbotec and Ecotec series combi boiler models, thereby increasing the reliabilit..
$38.15
Ex Tax:$31.79
-250x250.jpg "Viessmann Water Flow Sensor (Flow Turbine) – Vitodens 050T Trend Combi Boiler Compatible – 7876065 / VI7398247 – Female Push-Fit Connection")
Brand: OEM
Model: 77890006084
Product Description
The Viessmann water flow sensor (flow turbine) is an important component that detects water movement in the combi boiler system and ensures that the hot water circuit operates correctly. It is compatible with Vitodens 050T Trend combi boiler models and has a U-type black body ..
$18.33
Ex Tax:$15.28