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 "Vaillant Turbotec Combi Boiler Safety Relief Valve")
Brand: Scopo
Model: AI0794
Product Description
This 1/2" 3 bar safety relief valve is designed especially for the Vaillant Turbotec combi boiler series. In the event of overpressure in the boiler system, the safety relief valve automatically releases the excess pressure, ensuring that the boiler operates safely.
F..
$5.13
Ex Tax:$4.28
-250x250.jpg "Bosch, Buderus GB012 Compatible Combi Boiler Cold Water Outlet L Pipe")
Brand: Generous
Model: 77890040028
High-Strength Outlet L Pipe for Bosch Buderus GB012 Combi Boilers
The Bosch Buderus GB012 Cold Water Outlet L Pipe is a spare part that regulates the water flow in combi boiler systems and is resistant to high temperature and pressure. It comes with water sealing gaskets and provides long-term sa..
$3.44
Ex Tax:$2.86
Brand: Scopo
Model: AI0096
General Purpose
Used to add water to the system when the water pressure in the combi boiler drops. It is usually located in an easily accessible position under or near the combi boiler.
In the field it is also known as a filling tap or filling valve.
Compatibility
Designed to be comp..
$2.49
Ex Tax:$2.07
Brand: Ma-Ter
Model: xp602
Ma-Ter XP602 is a water pressure switch that monitors the water pressure in the combi boiler system; in the field it is also referred to as a combi boiler pressure sensor, pressure switch or water pressure switch. It is matched with the Baxi JJJ005114748 code on the packaging label, i.e. it is the e..
$4.85
Ex Tax:$4.05
-250x250.jpg "Combi Boiler Ignition Transformer - Anstoss ZIG 2/12 (Art No: 07000037) - Vaillant, Saunier Duval, Protherm Compatible")
Brand: Anstoss
Model: AR16
This high-performance combi boiler ignition transformer is specially designed so that your boiler carries out the ignition process efficiently.
The Anstoss ZIG 2/12 model offers a reliable spare part solution by providing compatibility across a wide range.
Product Features:
..
$9.66
Ex Tax:$8.05
-250x250.jpg "Push-Fit (Quick Connection) Combi Boiler Filling Tap Compatible with Beretta, Arçelik and Riello")
Brand: Generous
Model: 77890022040
A high-quality combi boiler filling tap used to top up the system with water, allowing you to set your boiler’s ideal system water pressure (between 1.5 - 2.0 bar). It is manufactured to be fully compatible with push-fit models of Beretta, Arçelik and Riello combi boilers.
In the field, it is also ..
$1.91
Ex Tax:$1.59
-250x250.jpg "Vaillant VUW Combi Boiler 3-Way Valve Step Motor")
Brand: K&N Control
Model: AI0361
The 3-way step motor compatible with Vaillant VUW combi boiler models is an important spare part designed to control water flow and heating functions in the combi boiler system. This step motor efficiently directs the boiler's heating and domestic hot water circuits, optimizing system performance. E..
$9.57
Ex Tax:$7.97
-250x250.jpg "Honeywell T7335D1008 Surface-Mount Combi Boiler NTC Sensor - 1/2")
Brand: Honeywell
Model: T7335D1008
The Honeywell T7335D1008 surface-mount NTC temperature sensor is designed for mounting on pipe surfaces in combi boiler and HVAC systems. It can be easily fixed to pipes with a diameter of 13-15 mm and provides reliable measurement over a wide temperature range of -20°C to 110°C . With a 10K-A ..
$4.48
Ex Tax:$3.74
-250x250.jpg "Ariston Microtec Tx - Hotpoint Combi Boiler Safety Relief Valve 3 Bar - 1/2\" Brass")
Brand: Scopo
Model: AI1863
Ariston Microtec Tx - Hotpoint Combi Boiler Safety Relief Valve 3 Bar is a safety component designed to relieve excess pressure in combi boiler systems. With a 3 bar pressure rating, this valve ensures safety in the system and keeps your combi boiler running properly. This 1/2 inch part is made of d..
$4.55
Ex Tax:$3.79
-250x250.jpg "Honeywell T7335D1016 Surface-Mount Combi Boiler NTC Sensor - 3/4")
Brand: Honeywell
Model: T7335D1016
The Honeywell T7335D1016 surface-mount NTC temperature sensor is designed specifically for 3/4 pipe diameter in combi boiler and HVAC systems. Operating over a temperature range of -20°C to 110°C, this sensor is known for its high accuracy and fast response time. With a 10K-A resistance value, this ..
$4.56
Ex Tax:$3.80
Brand: OEM
Model: DRB11
This is a Type 1 size duraboard ceramic fiber insulation plate used in the combustion chamber of Baymak combi boilers. This part, simply called asbestos in the field, keeps the heat of the burner flame inside the combustion chamber and limits heat transfer to the casing and surrounding parts. Plates..
$8.91
Ex Tax:$7.43
-250x250.jpg "Combi Boiler Ignition Transformer ZIG 2/12 Art.Nr. 07000028 - Compatible with Demirdöküm, Protherm, Glowworm, Hermann, Saunier Duval and Demrad")
Brand: Anstoss
Model: AR05
ZIG 2/12 Combi Boiler Ignition Transformer is a high-quality spare part designed to perform ignition reliably and efficiently in combi boilers. This model is frequently preferred thanks to its wide compatibility with different combi boiler brands.
Product Features
Product Code:..
$9.14
Ex Tax:$7.62
Brand: OEM
Model: DRB06
This is a duraboard type ceramic fiber insulation plate used in the combustion chamber of Baymak HT series boilers. This part, simply called asbestos in the field, keeps the heat of the burner flame inside the combustion chamber and limits heat transfer to the casing and surrounding parts. Plates pr..
$8.91
Ex Tax:$7.43
-250x250.jpg "Combi Boiler Water Flow Turbine Sensor - Ariston Egis Reed Switch Sensor")
Brand: OEM
Model: 77890006042
Product Description
Specially designed for Ariston Egis series combi boilers, this water flow turbine sensor with a reed switch ensures proper operation by accurately detecting the water flow of the appliance. Working with the magnetic system inside the turbine, the reed switch generates a signal a..
$4.36
Ex Tax:$3.64
Brand: OEM
Model: DRB07
This is the duraboard ceramic fiber insulation plate used in the combustion chamber front cover of ECA Confeo Premix condensing boilers. Known in the field simply as the asbestos board, this part keeps the heat of the burner flame in the combustion zone and limits the heat transferred to the cover. ..
$8.91
Ex Tax:$7.43
-250x250.jpg "Combi Boiler Safety Relief Valve 3 Bar 1/2 Female Thread")
Brand: Scopo
Model: 990000141
Product Features and Advantages
Max Pressure: 3 Bar - Provides safety in high-pressure situations.
Maximum Temperature Resistance: 110°C - Effective protection over a wide temperature range.
Material: High-quality metal and plastic - Offers durability and long life.
..
$2.95
Ex Tax:$2.46
-2-250x250.jpg "Demirdöküm Combi Boiler Ionization Ignition Electrode (Left)")
Brand: Erta
Model: KB.6010
Features
Compatible Brand: Demirdöküm
Position: Left
Function: Ionization and ignition
Product Description
Produced specifically for Demirdöküm combi boilers, this Ionization Ignition Electrode ensures that the boiler ignites the gas correctly and safely. The ionization electrode c..
$2.87
Ex Tax:$2.39
-250x250.jpg "Pakkens Combi Boiler 3 Bar Safety Relief Valve - Demirdöküm Aden, Nepto, Kalisto, Atron Compatible")
Brand: Pakkens
Model: PAK215-3
The Combi Boiler 3 Bar Safety Relief Valve is designed to be fully compatible with Demirdöküm Aden, Nepto, Kalisto and Atron models. Thanks to its forged brass body and ABS plastic head, it offers long service life and reliable performance. Made in Turkey, this product protects your boiler against o..
$4.30
Ex Tax:$3.58