Ariston Egis, Egis Plus, Clas, Genus Combi Boiler Expansion Vessel 3/8" 8 L - Chaffoteaux, Bosch, Buderus, Ferroli Compatible (Zilmet)

Ariston Egis, Egis Plus, Clas and Genus combi boiler expansion vessel: Zilmet 521, 8 liters, 3/8" fitting, round flat body. Replaces Ariston / Chaffoteaux original part number 65104261; the same vessel is also used in the BS 24, Matis 24, Egis Premium 24/30, Clas 24/28 and Clas Evo 24 models. Bosch, Buderus (87186425520), Ferroli (39841230), Hermann and Italtherm cross-reference codes are in the table below.

Product Description:
The combi boiler expansion vessel is a spare part with a 3/8 connection and 8-liter capacity, compatible with Ariston, Chaffoteaux, Bosch, Buderus, Ferroli, Hermann and Italtherm combi boilers. It offers an ideal solution for balancing pressure changes that occur in the system.

Product Features

• Product Type: Combi Boiler Expansion Vessel
• Capacity: 8 Liters
• Connection Diameter: 3/8
• Maximum Pressure: 3 bar
• Maximum Temperature: 90°C
• Brand: Zilmet
• Model: 521

Compatible Brands and Models

• Ariston: Compatible models
• Chaffoteaux: 65104261
• Bosch: Compatible models
• Buderus: 87186425520
• Ferroli: 39841230
• Hermann: 4002563
• Italtherm: 504000045

Product Advantages

• Ensures long-lasting operation of your combi boiler.
• Balances system pressure and offers safe use.
• Features easy installation and a durable construction.

Frequently Asked Questions

What does a combi boiler expansion vessel do?

The expansion vessel ensures safe operation of the system by balancing the pressure changes caused by heating in the combi boiler system. It helps prevent faults that pressure fluctuations can cause.

Which combi boiler brands is this 8-liter expansion vessel compatible with?

It is compatible with Ariston, Chaffoteaux, Bosch, Buderus, Ferroli, Hermann and Italtherm combi boilers. It is recommended that you verify its suitability for your own combi boiler using the original part codes.

What are the equivalent / original codes of the expansion vessel?

The original codes it is equivalent to: 65104261 (Chaffoteaux), 87186425520 (Buderus), 39841230 (Ferroli), 4002563 (Hermann) and 504000045 (Italtherm). The Yedepa product code is ZLM03, and the product is the Zilmet 521 model.

What are the technical specifications of the Zilmet expansion vessel?

The vessel has an 8-liter capacity and a 3/8 connection diameter. Its maximum pressure is 3 bar and its maximum operating temperature is 90°C.

Can I buy regularly with an invoice as a service company/technician?

Yes, all our sales are invoiced. All orders, including those from service companies and technicians, are placed directly through our website.

How do I track my shipment after ordering?

Your shipment tracking number is sent to your e-mail and phone after ordering; you can follow its status in the “Where Is My Shipment?” section.

Can I return or exchange the product?

Yes. Under Consumer Protection Law No. 6502 you have the right of withdrawal/return within 14 days of delivery. To avoid ordering the wrong model, we recommend that you verify compatibility before ordering. Details are on our “Delivery, Returns and Exchanges” page.

What payment and installment options are available?

You can pay by debit/credit card and Tosla, and take advantage of installment/credit options through Fibabanka and Akbank. Current options are listed on our “Payment Options” page.

Where is Yedepa located and how is delivery made?

Yedepa is an e-commerce site; orders are placed through yedepa.com and shipped to your address by courier from our warehouses across Turkey and from our contracted suppliers. Our head office is at Cennet Mah. 2. Yavuz Selim Cad. No:68/A, Küçükçekmece / İstanbul.