Is my Navien boiler behaving as expected?

[Oilyjoe]

It will be around an hour due to the coil being miss matched

Hi
Cheers
My boiler won’t heat the temperature in the cyclinder from 30 to 60 within an hour. In fact, it won’t even manage this is 90 minutes.

Can you think of any reasons for this? It’s the only zone on at the time.

 

[ShaunCorbs]

Internal or external pump ?

 

[Oilyjoe]

Internal or external pump ?

The boiler is in the garage and the pump is within the boiler. The distance between boiler and cylinder is about 10m.

 

[ShaunCorbs]

Yea something isn’t right any chance of a picture of the airing cupboard?

 

[Oilyjoe]

Yea something isn’t right any chance of a picture of the airing cupboard?

 

[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?