BTU CALCULATIONS - IS THIS A CAVITY

[Diggory]

Thanks reply.

a modern boiler is often rated at around 6 kW - 28 kW

I’m in the broad category you’ve referred to.
My boiler is an ecoFIT pure 825 combi; 25 kW / 85,000 BTU.
I’m not sure of a range bracket; in the way you’ve mentioned with a threshold at circa 6kW.

The estimating tools suggest I need circa 27,000BTU over nine rads.
I’ve got maybe 17sqm of UFH (16mm pipe under LVT).
One shower and hot water demand for two bed bungalow.
Not sure where this puts me in respect to your advice…

use a mark/space ratio

Thanks D