Riello RDB Oil Fired Boiler - can I use in sealed system

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21 Mar 2022
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Hi,

is it possible to use my existing Riello RDB boiler if I wanted to covert my current system to sealed and pressurised as it is currently vented and I am having lots of issues.

Douglas,
 
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Generally it is only Grant combi's that use 2.5 bar PRV's and I suspect that is more to protect the DHW heat exchanger seals rather than the boiler.
A check of the manufacturers instructions will reveal the boiler pressure rating. Riello is the burner manufacturer not the boiler.
 
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grant have made the 2.5bar PRV obsolete and now use a 3bar for all repairs
 

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