Expansion Tank Calculation

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Hi,
I have just had an oil heating system fitted which is a 36KW Grant Vortex Blue Combi with built in 25L expansion tank. I am trying to work out if I need an additional expansion tank (I have an additional 25L BOSS vessel that I could use if necessary).

I have quite a large bungalow and have done a very basic calculation that assumes the heating system water will expand by 3% etc. I have used the following figures.

Total Radiator Capacity: 20 x 10L = 200L
Total Pipework Capacity: 57L

The pipework is mainly 22mm which is why the above figure is so large.

From my very basic calculation, I calculated 3% of 257L and got 7.71L.

Is this a reasonable way to do the calculation? If I am way off I would appreciate a better way to calculate the figure?

Regards
Farmer Jo
 
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OK thanks, that was the answer that I was hoping for.

Regards
FarmerJo
 
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