Is my Navien boiler behaving as expected?

[Oilyjoe]

Hi

Yes, my airing cupboard with my cylinder and the heatmister control area.

The 90 won’t heat the water when it is the only active zone.

Thanks

 

[ShaunCorbs]

There’s a red wheel headed valve above the ufh stuff is that open fully ?

You coil is big enough now due to you having a twin coil system in series

 

[Oilyjoe]

There’s a red wheel headed valve above the ufh stuff is that open fully ?

You coil is big enough now due to you having a twin coil system in series

Hi

Yes, this is fully open.

 

[ShaunCorbs]

Try closing it half way eg 3 turns

 

[Oilyjoe]

Try closing it half way eg 3 turns

Any other potential issues that could be responsible?

 

[ShaunCorbs]

Any other potential issues that could be responsible?

Could be supply pipes from the boiler not fully clear / restriction as I would say that coil would easy heat the cylinder up within the hour

 

[Oilyjoe]

Could be supply pipes from the boiler not fully clear / restriction as I would say that coil would easy heat the cylinder up within the hour

You might be right. The last boiler used 28mm pipe and this uses 22mm supply/return but connecting to the existing 28mm pipe into the house

 

[RoryD]

Wondering if the Pump is up to scratch?... 10m?