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 "Surface Pipe-Type Combi Boiler NTC Temperature Sensor Slim Socket 3/4'' - Made in Italy")
Brand: CONTROL HTP
Model: SEN51
Product Description
This 3/4 inch surface pipe-type NTC temperature sensor provides high-precision temperature sensing in combi boilers and similar heating systems. Made in Italy, this model offers long-lasting use with its high-quality materials and sturdy metal clamp. It is widely preferred espec..
$2.97
Ex Tax:$2.47
-250x250.jpg "Ma-Ter XP602 C Combi Boiler Pressure Sensor")
Brand: Ma-Ter
Model: MT11
Ma-Ter XP602 C Combi Boiler Pressure Sensor, with a G1/4 connection size and part number 995903, is a high-quality spare part suitable for the heating systems of Ariston, Baxi, Ferroli, Hermann and Warmhaus.
Product Features
Wide Compatibility: Fully compatible with certain model..
$3.99
Ex Tax:$3.32
-250x250.jpg "Baymak Combi Boiler Spring-Loaded Flow Turbine")
Brand: Scopo
Model: 4823
Product Features
Product Type: Spring-Loaded Flow Turbine
Compatible Combi Boiler Models: Compatible with Baymak brand combi boilers
Material: Brass - Manufactured from durable and long-lasting materials
Product Description
The Baymak combi boi..
$3.83
Ex Tax:$3.19
-250x250.jpg "Baymak – Baxi – Wolf Combi Boiler Hydraulic Left Water Block Group (61010003 – 235845 – 3234090108859)")
Brand: Generous
Model: 77890040008
Product Description
The hydraulic left water block group used in Baymak, Baxi and Wolf combi boilers is an important part that ensures domestic hot water and heating water are directed correctly in the water circuit of the boiler. It supports efficient boiler operation, balances water flow and main..
$11.19
Ex Tax:$9.32
Brand: Novasfer
Model: KEV-1201
High-Pressure Capacity and Reliable Boiler Safety Component
Model: Baymak Combi Boiler Safety Relief Valve
Size: 1/2 Female Thread
Country of Manufacture: Italy
Pressure Capacity: 3 bar
Superior Safety and Easy Installation
This high-quality ..
$5.57
Ex Tax:$4.64
-250x250.jpg "Combi Boiler Safety Relief Valve 3 Bar 1/2\" Male - 1/2\" Female Flare")
Brand: Scopo
Model: EMNV02-3
The Combi Boiler Safety Relief Valve is manufactured to increase safety by providing pressure control in combi boilers and similar systems. With a working pressure of 3 bar, this product is made of brass and offers a long service life thanks to its durable construction. Locally manufactured, this sa..
$4.32
Ex Tax:$3.60
-250x250.jpg "Demirdöküm - Eca Combi Boiler Electronic Pressure Sensor")
Brand: Ceme
Model: 7182220605
Specially designed for Demirdöküm and Eca brand combi boilers, this pressure sensor accurately measures the water pressure of your combi boiler system and transmits it to the control board as an electronic signal. In this way, it ensures your combi boiler operates efficiently and safely.
..
$11.11
Ex Tax:$9.26
-250x250.jpg "Ceval Wired Room Thermostat: RQ Series")
Brand: Cewal
Model: RT01
Product Features
Product Code: 91934910
Compatible Models: EOLO MINI, NIKE MINI, MINI SPECIAL, VICTRIX, IRAN RADYATOR NEW
Material: Durable and long-lasting material
Design: Gooseneck-shaped design; its clip structure allows easy installation and removal
..
$10.86
Ex Tax:$9.05
-250x250.jpg "Combi Boiler Plate Heat Exchanger O-Ring Seal - Baymak, Baxi Luna, Ocean, Ariston Clas Compatible")
Brand: Generous
Model: 77890052084
Durable, High-Quality O-Ring Seal That Ensures Leak-Tightness
This heat exchanger O-ring seal is compatible with Baymak, Baxi Luna, Ocean and Ariston Clas combi boiler models and
is made of rubber material with high temperature and pressure resistance.
It provides excellent sealing ..
$0.40
Ex Tax:$0.33
Brand: Generous
Model: 990000217
Product Features
The Demirdöküm Aden / Kalisto Combi Boiler Filling Loop Tap allows you to add water to your combi boiler system easily and safely. This tap is compatible with Demirdöküm combi boiler models such as the Aden and Kalisto, and extends the life of your boiler while improving its ov..
$1.77
Ex Tax:$1.47
Brand: Scopo
Model: AI0115
Product Features
Compatible with many Vaillant models such as the Turbotec, Atmotec and Ecotec series, this filling tap offers safety and durability. With its automatic shut-off feature and rust-resistant materials, it provides long-term use.
In the field it is also known as a boiler filling val..
$2.23
Ex Tax:$1.86
-250x250.jpg "Bosch - Buderus - Eca Combi Boiler Filling Valve")
Brand: OEM
Model: FT12
High-quality ball-type filling tap compatible with Bosch, Buderus and Eca combi boilers. It provides an ideal boiler filling key replacement for models such as the Junkers Novatherm and Eurostar series. Product code: 8717405140.
In the field it is also known as a filling loop valve or water filling..
$3.45
Ex Tax:$2.87
-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:$4.27
-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..
$3.43
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..
$2.48
Ex Tax:$2.07
Brand: Scopo
Model: AI0113
ECA Proteus combi boiler filling valve is also referred to in the field as a "water filling tap" or "filling tap". It is the manual tap with a black T-handle and brass spindle at the bottom of the combi boiler. When the system pressure drops, mains water is taken into the combi boiler through this t..
$1.95
Ex Tax:$1.62
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:$4.04
-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:
..
$9.65
Ex Tax:$8.04