Oil burner position for single floor rear extension

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I am in the planning stage of a single floor rear extension with a flat roof. The extended space is everything below the green line shown in the attachment.

The oil burner is currently positioned in red circle 1. For added context, but not critical for the help needed here: as you can see, the burner is currently circled by a 'u-shaped' solid bricked structure, including the soil pipe to the right. There is no intention of removing that 'u-shaped' brick structure.

The idea was to keep the burner positioned in the same location, i.e. red circle 1, for the extension and the drawings have been made on that assumption.

I had an oil burner service a couple of months ago and I ended up chatting to the service technician (OFTEC registered, also installs burners and tanks, etc.) on the extension plans. He was of the view that I should consider re-positioning the oil burner to the position in red circle 2. For info, the oil supply comes from the tank bottom right (not shown), supply line shown approximately with purple line.

- He believed the burner flue for red circle 1 would need to be run up past the 2nd floor eaves...ie. would be very tall (and expensive?)...to ensure emissions bypass 2nd floor openings. He also believed that the flue run from the boiler would also need to be encased/entombed, which would add cost and complexity. This all sounded sounded reasonable to me, I have no idea of costs though. Does this sound correct?

- He believed the burner position in red circle 2 would be better because; a) no need to a flue extending beyond the 1st floor roof, and b) the supply line wouldn't need to run under the extension at all. Downsides to this option: i) does it even in this configuration in the kitchen space? I think yes, but it would need to squeeze into bottom right of kitchen so may then have access concerns for service etc. if wedged in corner, ii) burner exhaust/flue needs to be a minimum of XXXmm (600mm?) from doors, in this case the rear door on the far right of the image. Perhaps more downsides too?

I could do with a 2nd opinion on the assumptions I've made above, do any of them look incorrect please?

And with this all in mind, what are peoples thoughts on the best option in positioning the burner and why?

extension snip.PNG
 
When we are looking at oil boiler changes especially if in new position we fit look if there was a place to fit a external boiler
They are just as efficient take .up no room inside no smell of kero in building normal cost neutral compared with internal boiler.
If fitting a internal boiler always try to put it on a external wall.
Reason? more cost effective flueing.
Do our level best never ever to fit in middle of properly just way more difficult (and expensive) to fit.
 

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