Expansion Vessel for Metropolis DGT 25 BF Boiler - Ref. 5183726
RefurbishedSimeExpansion vessels

Expansion Vessel for Metropolis DGT 25 BF Boiler - Ref. 5183726

Stock · 5 units

When you turn on the tap or start the heating, the expansion vessel for the Metropolis DGT 25 BF boiler - Ref. 5183726 from Sime is responsible for absorbing the increase in water volume as it heats up. If this part fails, you will notice that the boiler pressure fluctuates sharply and the safety valve may start to leak. This expansion vessel is compatible with several Sime models, such as the Metropolis DGT 25 OF and the Ecomfort Plus 25 HE-EV, among others. It is advisable to replace it if you observe these symptoms to avoid larger issues.

VAT included

Compatibility

Sime boilers compatible with reference 5183726

Expansion vessel with reference 5183726. 18 verified compatibilities: Metropolis DGT 25 BF and Metropolis DGT 25 OF.

Proven compatibility

Boiler modelFamilyVerification
Sime Metropolis DGT 25 BFSimeContrasted
Sime Metropolis DGT 25 OFSimeContrasted
Sime Metropolis DGT 30 BFSimeContrasted
Sime Metropolis Digito 25CSimeContrasted
Sime Metropolis Digito 25VSimeContrasted
Sime Metropolis Digito 30VSimeContrasted
Sime Ecomfort Plus 25 HE-EVSimeContrasted
Sime Ecomfort Plus 30 HE-EVSimeContrasted
Sime Brava DGT-HE 12TSimeContrasted
Sime Brava DGT-HE 25SimeContrasted
Sime Brava DGT-HE 30SimeContrasted
Sime Brava DGT-HE 35SimeContrasted
Sime Format DGT 25 BFSimeContrasted
Sime Format GPL DGT 25 BFSimeContrasted
Sime Format LPG DGT 30 BFSimeContrasted
Sime Format MET DGT 25 BFSimeContrasted
Sime Format MET DGT 30 BFSimeContrasted
Sime Format Low NOx 25 BFSimeContrasted

Can't see your model or have questions? The printed reference takes precedence. How to check it ·

Guide

How to check if the part number 5183726 is the one for your boiler.

What determines it is not the boiler model, but the reference printed on the part you already have installed.

  1. Find the reference printed on the installed part and check whether it matches the catalogue reference 5183726. If it is not visible, do not identify the part from its shape alone.
  2. Check the full boiler model on its data plate and look for it in the model associations on this page.
  3. Compare the connections and physical body with the original part before installation.
  4. If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.
Diagnosis and fault codes

Symptoms and faults that the expansion vessel 5183726 resolves.

The expansion vessel absorbs the expansion of water when heated. These are the typical symptoms and what to do:

Common symptoms and faults

  • 01

    The boiler loses pressure every few days and the heating circuit needs to be refilled.

    Cause: The expansion vessel has lost its air charge and no longer compensates for the expansion of the water when heated, causing the system to be short on pressure.

    Check for visible leaks in radiators, bleed valves, or fittings before considering the expansion vessel acceptable.

  • 02

    The safety valve drips or releases water from time to time, especially when the heating has been on for a while.

    Cause: If the expansion vessel does not absorb the expansion, the excess pressure escapes wherever it can: the safety valve.

    Check if the dripping coincides with the start of the heating or if it is also constant with the boiler cold; that already gives a good indication.

  • 03

    The tank sounds solid, as if filled with water, when struck sharply with the hand on the casing.

    Cause: When the internal membrane breaks, air is lost and the vessel fills with water to its full capacity.

    Tap the top of the tank: if it sounds hollow, there is air; if it sounds full across the entire surface, the diaphragm is ruptured.

  • 04

    The pressure gauge rises quickly as soon as the burner starts, almost suddenly.

    Cause: Without an air cushion to absorb the increase in volume, the pressure in the circuit rises directly when heated.

    Note the cold pressure before turning on and compare it with the reading a few minutes after starting the heating.

These symptoms can have more than one cause. If your boiler displays a fault code, send it to us via WhatsApp along with a photo of the labeling, and we'll tell you if this is the part.

Technical data

Expansion vessel data sheet Sime 5183726

Catalogue reference
5183726
Brand
Sime
Type of part
Expansion vessels
Units in stock
5 units
Status
Refurbished
Warranty
1 year
Shipping
1-2 business days
Return
14 days
Frequently Asked Questions

Frequently asked questions about the expansion vessel 5183726

What fault indicates that the expansion vessel of the Metropolis DGT 25 BF boiler needs to be replaced?
It should be replaced when it loses air pressure and the boiler loses pressure or bleeds water through the safety valve.
Which models are compatible with the expansion vessel VSSIH25BF?
It is compatible with the following models: Metropolis DGT 25 BF, Metropolis DGT 25 OF, Metropolis DGT 30 BF, Metropolis Digito 25C, Metropolis Digito 25V, Metropolis Digito 30V, Ecomfort Plus 25 HE-EV, Ecomfort Plus 30 HE-EV, Brava DGT-HE 12T, Brava DGT-HE 25, Brava DGT-HE 30, Brava DGT-HE 35, Format DGT 25 BF, Format GPL DGT 25 BF, Format GPL DGT 30 BF, Format MET DGT 25 BF, Format MET DGT 30 BF, Format Low Nox 25 BF.
What symptoms indicate that the expansion vessel of my boiler needs to be replaced?
The symptoms include loss of pressure in the boiler and water discharge from the safety valve.
What is the reference for the expansion vessel for the Metropolis DGT 25 BF boiler?
The reference for the expansion vessel is VSSIH25BF.
How many models are compatible with the expansion vessel VSSIH25BF?
A total of 18 models are compatible with this expansion vessel.
Are there documented fault codes for the expansion vessel VSSIH25BF?
No, there are no documented fault codes for this product.

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Expansion Vessel for Metropolis DGT 25 BF Boiler - Ref. 5183726