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Why do I have 2 Expansion Vessel

View the thread, titled "Why do I have 2 Expansion Vessel" which is posted in Central Heating Forum on UK Plumbers Forums.

R

Rahul Sood

I have Gledhill 300L unvented water cylinder storage system with Vaillant Boiler. We are using it for UFH and radiators. My plumber has fitted 2 expansion vessels

1) Zilmet - 18 Litre Red Heating Expansion Vessel & Sealed System

2) MULTIFUNCTIONAL TANKS WITH REPLACEABLE MEMBRANE

Why has he got tanks? Is one for UGH and other for Radiators?

Thanks,

Rahul
 

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