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 "Combi Boiler Plate Heat Exchanger Gasket 4.5 mm")
Brand: Generous
Model: 7180700008
General Features
Country of Manufacture: Turkey
Material: Grade A Soft Plastic
Thickness: 4.5 mm
Application and Use
Designed to provide perfect sealing between heat exchanger plates. Thanks to its heat- and pressure-resistant properties, it is suitable for long-term use. Correct i..
$0.25
Ex Tax:$0.21
-250x250.jpg "Combi Boiler Pressure Gauge (CEWAL Ø40 Manometer – Ferroli Compatible 40030560) | Combi Boiler Manometer")
Brand: Cewal
Model: CWM37
Product Description
CEWAL brand Ø40 combi boiler manometer, Ferroli compatible, is a reliable pressure gauge specially developed for Ferroli combi boilers. 40030560 is the part code of this model, which accurately measures the water pressure in combi boiler systems and increases system safety. With..
$7.11
Ex Tax:$5.92
-250x250.jpg "Combi Boiler Pressure Gauge Ø40 Manometer (ITM – Vaillant VUW Compatible 101271) | Combi Boiler Manometer")
Brand: I.T.M
Model: CWM06-C
Product Description
The ITM branded Ø40 combi boiler pressure gauge is a reliable manometer made specifically for Vaillant VUW series combi boilers. With code 101271, this model measures the water pressure in the combi boiler's heating circuit precisely, contributing to safe and efficient operation..
$5.29
Ex Tax:$4.41
-250x250.jpg "Combi Boiler Repair Kit - Demirdöküm Milenyum Plus (Full Kit)")
Brand: Scopo
Model: AI0366
Compatible with Demirdöküm Milenyum Plus models, this full combi boiler repair kit contains all the parts required for the maintenance and repair of your boiler's 3-way valve system. The product is made using durable forged brass material and offers long-lasting performance.
Product Featu..
$6.48
Ex Tax:$5.40
-250x250.jpg "Combi Boiler Repair Kit Nipple - Male 3/4\" Brass Connection")
Brand: OEM
Model: 77890064015
Durable and Leak-Proof Combi Boiler Fitting
Combi boiler repair kit nipple is a part designed to ensure safe water transfer in combi boiler and plumbing connections, featuring a male 3/4" brass connection for secure fitting. Thanks to its high-quality brass material, it is long-lasting, and i..
$2.68
Ex Tax:$2.24
-250x250.jpg "Combi Boiler Safety Relief Valve 1/2\" – Vaillant, Protherm, Saunier Duval, Ferroli Compatible – Orkli 178985 / 0020047005 / 0020014173 / S1006700")
Brand: OEM
Model: 77890026084
Product Description
The combi boiler safety relief valve is an important safety component that ensures safe system operation by relieving any overpressure that may occur in the appliance’s water circuit. Manufactured by Orkli, this 1/2 inch valve is compatible with Vaillant, Protherm, Saunier Duval..
$7.02
Ex Tax:$5.85
-250x250.jpg "Combi Boiler Socket-Type Flow Turbine Sensor Red – Baymak Luna 3, Novades, Arçelik Compatible")
Brand: I.T.M
Model: FS17
Product Description
Used in the water flow system of combi boilers, the Red Socket-Type Flow Turbine Sensor is designed to be compatible with Baymak and Arçelik combi boiler models. By detecting the water flow rate, it helps increase the operating efficiency of the boiler. As an original spare part..
$6.58
Ex Tax:$5.49
-250x250.jpg "Combi Boiler Water Filling Tap - Baxi Main Four, Westen Quasar D Compatible")
Brand: Novasfer
Model: 77890022046
Durable Water Filling Tap for Baxi and Westen Combi Boilers
Combi boiler water filling tap is specially designed for Baxi and Westen combi boiler models and is used to balance water pressure and top up lost water. Codes 5700370 and 710224400 are the original spare part codes it corresponds to..
$6.12
Ex Tax:$5.10
new
Brand: I.T.M
Model: FT16
The combi boiler water filling tap (filling valve) is used to top up the water lost from the heating circuit and bring the pressure back to the operating value. In Baxi's official spare parts lists, this part appears as item 90 – FILLING TAP; its code is JJJ005667980 (short form of the same code: 56..
$4.53
Ex Tax:$3.78
-250x250.jpg "Combi Boiler Water Filling Valve Extension - Ferroli Compatible")
Brand: OEM
Model: 77890022030
Durable Water Filling Valve Extension Piece for Ferroli Combi Boilers
Combi boiler water filling valve extension, Ferroli combi boiler compatible, is designed to make the water filling process easier. Made of durable brass, this part offers long-lasting use and fits the combi boiler water fil..
$2.17
Ex Tax:$1.81
new
Brand: Pakkens
Model: FS38
The combi boiler water flow regulator (flow limiter) is the part that keeps the flow rate constant in the domestic hot water line regardless of mains pressure. The blue elastomer ring inside the white plastic body narrows its own passage as the pressure increases; this way the water always passes th..
$1.72
Ex Tax:$1.43
-250x250.jpg "Combi Boiler Water Flow Sensor (Flow Switch Reader) BI1091104 – 172503 – 500641 – 999075 - Alarko, Süsler, Airfel, Baxi, Fugas, Ideal, Biasi, Halstead, Ariston Compatible")
Brand: Chunhui
Model: 77890004014
Product Description
The combi boiler water flow sensor (flow switch reader) is an important part that detects hot water flow in the boiler system and makes the appliance start. This part detects water movement when a tap is opened and starts the boiler’s hot water production. It is fully compatible..
$10.39
Ex Tax:$8.66
-250x250.jpg "Combi Boiler Water Flow Switch - Compatible with Baymak Eco, Luna and Alpha Models")
Brand: I.T.M
Model: RU03
Product Features
This water flow switch is an important spare part designed to monitor and control water flow in combi boilers. It can be used with Baymak Eco, Luna and Alpha models as well as Baxi JJJ005625770 and other compatible systems.
Compatible Models
Baymak Eco
..
$2.28
Ex Tax:$1.90
Brand: Bitron
Model: 32700021
Product Description
The Bitron 32700021 combi boiler water pressure switch was developed to ensure safety in combi boiler systems and to keep the appliance operating properly. By measuring the pressure level, it prevents the system from starting at low water pressure. It is fully compatible with Ba..
$12.40
Ex Tax:$10.34
Brand: Cewal
Model: CWM08
For Demirdöküm Aden and Kalisto series combi boilers, this specially designed Cewal-branded manometer is used to precisely measure the water pressure inside the combi boiler. Manufactured in Italy, this high-quality part stands out with its durability and reliability.
Product Features
..
$6.31
Ex Tax:$5.26
Brand: Scopo
Model: 990001036
Product Features
Application: For Demirdöküm Aden combi boiler appliances
Valve Pressure: 3 BAR
Size: 1/2" with O-ring
Product Description
Specially designed for Demirdöküm Aden combi boiler models, this safety relief valve ensures the safety of your ..
$3.00
Ex Tax:$2.50
-250x250.jpg "Demirdöküm Combi Boiler Flow Turbine (Flow Switch) 1/2 – 2-Wire – 53015")
Brand: HUA DI
Model: HAD20
Used in Demirdöküm brand combi boilers, this flow turbine (flow switch) controls the operation of the combi boiler by detecting the water flow in the domestic hot water line. When water flow starts, it sends a signal to the electronic board so that the combi boiler ignites. With its 2-wire design, t..
$6.38
Ex Tax:$5.32
Brand: I.T.M
Model: 990000014
Product Features
Screw Spacing: 167 mm - Measure as Shown in the Second Product Photo
Number of Plates: 14
The product you purchase will reach you brand new (unused), in its original packaging and with an invoice. It is covered by a 2-year warranty under the Consum..
$28.17
Ex Tax:$23.47